Tee switch with shunt for improved receiver sensitivity

Abstract

Aspects of the disclosure relate to apparatuses, wireless communication devices, methods, and circuitry for t-switches with gate shunting. One aspect is an apparatus comprising a first differential switch having a control input. The apparatus also includes a second differential switch coupled to the first differential switch, the second differential switch being the control input. A shunt capacitor is coupled between a first output and a second output of the first differential switch and a first input and a second input of the second differential switch. A first shunt switch having a control input, an input, and an output has the input and the output coupled to the control input of the first differential switch. A second shunt switch having a control input, an input, and an output has the input and the output coupled to the control input of the second differential switch.

Description

Technical Field

[0001] This disclosure generally relates to electronic communications, and more specifically to devices, wireless communication apparatuses, and circuit systems for implementing a T-switch with gate shunt to improve receiver sensitivity, for example, in a multi-band multi-carrier wireless receiver. Background Technology

[0002] In today's interconnected world, many services provided by electronic devices rely at least in part on electronic communications. Electronic communications can include those communications that use wireless or wired signals transmitted over one or more networks (such as the Internet or cellular networks) and exchanged between or among distributed electronic devices. Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0003] Multiple access technology has been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the municipal, national, regional, and even global levels. An example telecommunications standard is 5G New Radio (NR). 5G NR is part of the Continuous Mobile Broadband Evolution (CMB) initiative released by the 3rd Generation Partnership Project (3GPP), which addresses new requirements associated with latency, reliability, security, scalability (e.g., the Internet of Things (IoT)), and other demands. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard.

[0004] Electronic devices are expected to handle different types of wireless communication. However, different electronic devices are expected to meet different constraints in terms of size, cost, power consumption, or other factors. Therefore, electrical engineers and other designers of electronic devices strive to enable electronic devices to handle different types of wireless communication while taking efficiency and performance constraints into account. Summary of the Invention

[0005] Systems, apparatuses, methods, and computer-readable media for electronic communications are disclosed, and more specifically, devices, wireless communication apparatuses, and circuit systems for implementing a T-switch with gate shunt to improve receiver sensitivity, for example, in a multi-band multi-carrier wireless receiver. Some aspects of the T-switch circuit system described herein improve the operation of the wireless receiver by enhancing the isolation of the receiving channel in a multi-band multi-carrier device. Some aspects of the T-switch circuit system described herein further improve device performance due to the T-switch circuit system structure, while maintaining or improving device reliability, as described in detail below.

[0006] In one example, a wireless communication device is provided. The wireless communication device includes a first differential switch having a first differential input, a first differential output, and a first control input. The device includes a second differential switch having a second differential input, a second differential output, and a second control input connected to the first differential output. The device includes a shunt capacitor coupled between a first input and a second input of the first differential output, wherein the shunt capacitor is also coupled between a first input and a second input of the second differential input. The device includes a first shunt switch having a third control input, a third input, and a third output, wherein the third input and the third output are coupled across the first control input. The device includes a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input and the fourth output are coupled across the second control input.

[0007] In one example, a method is provided. The method includes: controlling a switching circuit system of a circuit in a first mode using a first control signal to isolate the inputs of the switching circuit system from its outputs, the first control signal being configured to: select an open configuration for a first switch and a second switch, the first switch having an input, an output, and a control input for the first control signal, and the second switch having an output for the control signal, an input coupled to the output of the first switch, and a control input; and selecting a closed configuration for a first shunt switch and a second shunt switch, the first shunt switch being configured to shunt a parasitic transmission path signal from the first switch when the first switch is in an open configuration and the first shunt switch is in a closed configuration, and the second shunt switch being configured to shunt a parasitic transmission path signal from the second switch when the second switch is in an open configuration and the second shunt switch is in a closed configuration; and controlling the switching circuit system of a circuit in a second mode using a second control signal to connect the inputs of the switching circuit system to its outputs, the second control signal being configured to: select a closed configuration for the first switch and a closed configuration for the second switch; and selecting an open configuration for the first shunt switch and the second shunt switch.

[0008] In one example, a wireless communication device is provided. The wireless communication device includes components for controlling a switching circuit system in a first mode using a first control signal to isolate the input of the switching circuit system from its output. The first control signal is configured to: select an open configuration for a first component of the switch and a second component of the switch; and select a closed configuration for a third component and a fourth component of the switch. The first component of the switch is configured to shunt parasitic transmission path signals from the first component of the switch in the open configuration, and the fourth component of the switch is configured to shunt parasitic transmission path signals from the second component of the switch in the open configuration. The device also includes components for controlling the switching circuit system in a second mode using a second control signal to connect the input of the switching circuit system to its output.

[0009] In one example, another wireless communication device is provided. This wireless communication device includes: a first differential switch having a first input and a second input, a first output and a second output, and a control input; a second differential switch having a first input and a second input coupled to the respective first and second outputs of the first differential switch, the second differential switch also having a first output, a second output, and a control input; a shunt capacitor coupled between the first and second outputs of the first differential switch, the shunt capacitor also being coupled between the first and second inputs of the second differential switch; a first shunt switch having a control input, an input, and an output, the input and output coupled to the control input of the first differential switch; and a second shunt switch having a control input, an input, and an output, the input and output coupled to the control input of the second differential switch.

[0010] In some examples, the first differential switch includes a first transistor and a second transistor, wherein a first input of the first differential input includes a first terminal of the first transistor, and wherein a second input of the first differential input includes a first terminal of the second transistor. Some such examples are configured such that a first input of the first differential output includes a second terminal of the first transistor, a second input of the first differential output includes a second terminal of the second transistor, and a first control input includes the gate of the first transistor and the gate of the second transistor.

[0011] In some examples, the first differential switch includes a first transistor and a second transistor, wherein a first input of the first differential input includes the source of the first transistor, and wherein a second input of the first differential input includes the source of the second transistor. Some such examples are configured such that a first input of the first differential output includes the drain of the first transistor, a second input of the first differential output includes the drain of the second transistor, and a first control input includes the gate of the first transistor and the gate of the second transistor.

[0012] Some examples are configured where the first shunt switch includes a third transistor having a drain coupled to the gate of the first transistor and a source coupled to the gate of the second transistor, and where a third control input includes the gate of the third transistor. Some examples are configured where the second differential switch includes a fourth transistor and a fifth transistor, where a first input of the second differential input includes the source of the fourth transistor, a second input of the second differential input includes the source of the fifth transistor, a first input of the second differential output includes the drain of the fourth transistor, a second input of the second differential output includes the drain of the fifth transistor, and a second control input includes the gates of the fourth and fifth transistors. Some such examples are configured where the second shunt switch includes a sixth transistor having a drain coupled to the gate of the fourth transistor and a source coupled to the gate of the fifth transistor, and where a fourth control input also includes the gate of the sixth transistor.

[0013] In some examples, the device is configured such that the first differential switch, the second differential switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of the receiving circuit.

[0014] Some examples are also configured to have a transformer with a transformer differential output coupled to the first differential input. Some examples also include a capacitor bank coupled across the transformer differential output. Some examples include a first differential switch, a second differential switch, a first shunt switch, a second shunt switch, and a shunt capacitor configured as a separate differential T-switch.

[0015] In some examples, an apparatus also includes multiple receive paths reconfigurable to support multiple communication bands of multiple communication standards, wherein a first receive path can be isolated from a second receive path among the multiple receive paths using a split differential T-switch. Some such examples include an antenna coupled to a mixer in the first receive path.

[0016] Some examples of a device include a control circuitry system coupled to a first control input, a second control input, a third control input, and a fourth control input. In some such examples, the control circuitry system is configured to deselect the first and second control inputs while selecting the third and fourth control inputs to disconnect a first differential switch and a second differential switch, while simultaneously closing a first shunt switch and a second shunt switch to isolate the first and second inputs of the first differential switch from the first and second outputs of the second differential switch. In some such examples, the control circuitry system is configured to select the first and second control inputs while deselecting the third and fourth control inputs to close the first and second differential switches, while simultaneously disconnecting the first and second shunt switches to couple the first differential input to the second differential output. Some examples include a modem coupled to the control circuitry system.

[0017] According to at least one example, a wireless communication device is provided, the wireless communication device including a first switching component, a second switching component, a capacitor between the first switching component and the second switching component, and a component for shunting a leaked signal.

[0018] Another example includes a method of operating a switch using control inputs from the aforementioned wireless device. Another example includes instructions in a computer-readable storage medium for operating a switching circuit system or switching device as described above.

[0019] Another example is a wireless communication device that includes a first single-ended switch having a first input, a first output, and a first control input. The device includes a second single-ended switch having a second input, a second output, and a second control input connected to the first output. The device includes a shunt capacitor coupled between the first output and a reference potential (e.g., ground), wherein the shunt capacitor is also coupled between the second input and the reference potential. The device includes a first shunt switch having a third control input, a third input, and a third output, wherein the third input is coupled to the first control input, and the third output is coupled to the reference potential. The device includes a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input is coupled to the second control input, and the fourth output is coupled to the reference potential.

[0020] In some examples, the first single-ended switch includes a first transistor, a first input includes the source of the first transistor, a first output includes the drain of the first transistor, and a first control input includes the gate of the first transistor. In some such examples, the first shunt switch includes a third transistor having a drain coupled to the gate of the first transistor and a source coupled to a reference potential, and wherein a third control input includes the gate of the third transistor. In some such examples, the second single-ended switch includes a second transistor, a second input includes the source of the second transistor, a second output includes the drain of the second transistor, and a second control input includes the gate of the second transistor.

[0021] In some examples, the second shunt switch includes a fourth transistor having a drain coupled to the gate of the second transistor and a source coupled to a reference potential, and wherein the fourth control input also includes the gate of the fourth transistor. In some such examples, the first single-ended switch, the second single-ended switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of a receiving circuit.

[0022] Some examples of a device further include a first mixer coupled to a second output of a second single-ended switch and a second receiving path of the receiving circuit. In some such examples, the second output of the second single-ended switch is coupled to the output of the second receiving path, and the first receiving path further includes a low-noise amplifier (LNA) having an output coupled to a first input. Some examples are configured where the first single-ended switch, the second single-ended switch, the first shunt switch, the second shunt switch, and the shunt capacitor are configured as a split-type T-switch.

[0023] Some such examples include multiple receive paths that can be reconfigured to support multiple communication bands of multiple communication standards, wherein a first receive path can be isolated from a second receive path among the multiple receive paths using a split-type T-switch. Some examples include antennas coupled to an LNA.

[0024] Some examples include control circuitry systems coupled to a first control input, a second control input, a third control input, and a fourth control input. In some such examples, the control circuitry system is configured to deselect the first and second control inputs while selecting the third and fourth control inputs to disconnect the first switch and the second input from the second output. In some such examples, the control circuitry system is configured to select the first and second control inputs while deselecting the third and fourth control inputs to close the first and second switches, while simultaneously disconnecting the first and second shunt switches to couple the first input to the second output.

[0025] Another example is a wireless communication device comprising: a switching circuit system including a first switch and a second switch, the first switch having a first input, a first output, and a first control input, and the second switch having a second input, a second output, and a second control input electrically coupled to the first output of the first switch. The switching circuit system further includes a third switch, a fourth switch, and a capacitor, the third switch having a third input, a third output, and a third control input, the fourth switch having a fourth input, a fourth output, and a fourth control input electrically coupled to the third output of the third switch, and the capacitor electrically having a first terminal electrically coupled to a first node between the first and second switches and a second terminal electrically coupled to a second node between the third and fourth switches. The switching circuit system further includes a fifth switch electrically coupled between the first and third control inputs and a sixth switch electrically coupled between the second and fourth control inputs.

[0026] Some example operations involve a switching circuit system coupled between a low-noise amplifier (LNA) and a mixer. Some example operations involve the LNA having a differential output, where a first input of a first switch and a third input of a third switch are configured to receive the differential signal output by the LNA. Some such example operations involve the LNA being a first LNA, where the mixer is coupled to a receiving circuit having a second LNA. Some example operations involve the LNA also being connected to a receiving path with another mixer different from the mixer described above. Some such example operations involve the first switch being a first transistor, the second switch being a second transistor, the third switch being a third transistor, the fourth switch being a fourth transistor, the fifth switch being a fifth transistor, and the sixth switch being a sixth transistor.

[0027] Another example is a wireless communication device including a switching circuit system comprising a first transistor having a first source, a first drain, and a first gate input. The switching circuit system also includes a second transistor having a second source electrically coupled to the first drain of the first transistor, wherein the second transistor has a second drain and a second gate. The switching circuit system further includes a third transistor having a third source, a third drain, and a third gate. The switching circuit system also includes a fourth transistor having a fourth source electrically coupled to the third drain of the third transistor, wherein the fourth transistor has a fourth drain and a fourth gate. The switching circuit system also includes a capacitor electrically grounded with a first terminal electrically coupled to a first node between the first drain and the second source, and the capacitor also has a second terminal electrically coupled to a second node between the third drain and the fourth source. The switching circuit system further includes a fifth transistor having a fifth source coupled to the third gate, a fifth drain coupled to the first gate, and a fifth gate. The switching circuit system also includes a sixth transistor having a sixth source coupled to the fourth gate, a sixth drain coupled to the second gate, and a sixth gate.

[0028] In some examples, the first, second, third, fourth, fifth, and sixth gates are electrically coupled to a control circuitry system that selects the switching state of the switching circuitry system. In some examples, the switching circuitry system is coupled between the LNA and the mixer.

[0029] Another example includes an apparatus comprising a first component for switching high-frequency signals and a second component for switching high-frequency electrical signals, and a shunt capacitor, wherein the apparatus is configured as a separate, split-type T-switch having one or more components for shunting parasitic capacitance leakage signals to increase isolation across the switch at high frequencies.

[0030] Other methods include using control inputs to control the operation of one or more switches in the receiver circuitry system described above. Another example includes instructions in a computer-readable storage medium for operating one or more T-switches to route received signals among multiple mixers or to isolate a received channel from one or more additional received channels in the device, as described above.

[0031] This invention is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used alone to define the scope of the claimed subject matter. The subject matter should be understood through reference to the appropriate portions of the entire specification of this patent, any or all of the accompanying drawings, and each claim.

[0032] The above, as well as other features and embodiments, will become more apparent from the following description, claims, and drawings. Attached Figure Description

[0033] The illustrative embodiments of this application are described in detail below with reference to the accompanying drawings:

[0034] Figure 1 An example environment including an electronic device with a wireless transceiver is shown, according to the example described herein, wherein the receiving path may include an implementation of a differential T-switch.

[0035] Figure 2 An example of a wireless transceiver with a transceiver unit according to the example described herein is shown, which may include an implementation of a differential T-switch.

[0036] Figure 3 The receive path of a wireless transceiver according to the example described herein is shown, which may include an implementation of a differential T-switch.

[0037] Figure 4A Aspects of a receiver switch matrix (RxSM) according to an example described herein are shown, which may include multiple implementations of differential t-type switches.

[0038] Figure 4B Aspects of an RxSM, which may include a differential T-type switch, are shown according to examples described herein.

[0039] Figure 5 This is a diagram of two receive paths coupled to a single mixer, which may include an implementation of a differential T-switch, based on the example described herein.

[0040] Figure 6 This is a block diagram of a differential T-switch based on some examples described in this article.

[0041] Figure 7A This is a schematic diagram of the implementation of a differential T-switch based on some examples described in this article.

[0042] Figure 7B This is a functional diagram of a differential T-switch with a first control setting based on some examples described in this article.

[0043] Figure 7C This is a functional diagram of a differential T-switch operating under a second control setting, based on some examples described in this document.

[0044] Figure 8 This is a block diagram of a single-ended T-switch based on some examples described in this article.

[0045] Figure 9 This is a schematic diagram of the implementation of a single-ended T-switch based on some examples described in this article.

[0046] Figure 10 This is a diagram of two receive paths coupled to a single mixer, which may include an implementation of a single-ended T-switch, based on the example described herein.

[0047] Figure 11A This is a flowchart illustrating the method according to the example described in this article.

[0048] Figure 11B This is a flowchart illustrating the method according to the example described in this article.

[0049] Figure 12 An example electronic device is shown according to the examples described herein, which includes a transceiver capable of implementing a T-switch. Detailed Implementation

[0050] Certain aspects and embodiments of this disclosure are provided below. It will be apparent to those skilled in the art that some of these aspects and embodiments can be applied independently, and some can be combined. Specific details are set forth in the following description for purposes of explanation, to provide a thorough understanding of embodiments of this application. However, it will be apparent that various embodiments may be practiced without these specific details. The accompanying drawings and specification are not intended to be limiting.

[0051] The following description provides only exemplary embodiments and is not intended to limit the scope, applicability, or configuration of this disclosure. Rather, the subsequent description of the exemplary embodiments will provide those skilled in the art with enabling descriptions for implementing exemplary embodiments. It should be understood that various changes may be made to the function and arrangement of the elements without departing from the spirit and scope of this application as set forth in the appended claims.

[0052] The demand for higher data rates and throughput has driven the development of wireless protocols such as the new 5G radio protocol, which specifies more frequency bands and wider modulation bandwidths. Simultaneously, wireless devices and transceivers can be designed to support previous communication standards, such as the 2G, 3G, and 4G standards corresponding to the 3GPP wireless communication standards. The additional frequency bands and wider bandwidths used for new communication standards increase the coexistence challenges between adjacent operating wireless protocols, especially where parasitic capacitances can make it difficult to isolate higher frequency signals. Transceivers supporting multiple generations of devices can use multiple input radio frequency (RF) ports, which will be connected via multiple communication channels (e.g., paths) using a receiver switch matrix (RxSM) for full configurability.

[0053] Some RxSM devices are designed to minimize the size and circuit area used, which can lead to interference and concurrency issues. For example, interference and concurrency problems can arise due to the limited isolation of multiplexed switches in compact designs. Some RxSM circuit designs that can improve isolation trade off between signal loss and switch isolation. This tradeoff limits the possible isolation in practical devices, especially for higher frequency communication paths within the device. The examples described herein improve the operation of communication circuits and devices with T-type switches that can improve isolation with a small increase in circuit area. The increased isolation can improve the performance of receiver switch matrix (RxSM) circuitry, wireless transceivers, wireless devices (e.g., mobile phones, tablet devices, wireless-capable desktop or personal computer devices, tablet computers, wearable devices, extended reality (XR) devices (such as virtual reality (VR), augmented reality (AR), and / or mixed reality (MR) devices), and / or other devices or device components with receive paths (where performance is affected by isolation and / or multiple receive paths are tightly integrated).

[0054] One example described in this paper includes an RxSM with a dual-switch t-type structure or a split-switch t-type structure, wherein there are complementary controlled switching shunts at the gates of the two main switches (e.g., which form a dual-switch or split-switch). The shunt path causes the signal to cancel itself out at a common node (e.g., across the differential signal path in a differential implementation, or across the signal path to a reference potential in a single-ended implementation), thereby greatly increasing isolation. The use of shunt capacitors addresses potential performance issues associated with the reliability of parallel switches and differential oscillation. Examples of both differential and single-ended implementations are described below.

[0055] The use of T-switch configurations in various designs can improve device operation by enabling additional functionality and enhancing communication performance. For example, in some devices, the use of the T-switch examples described herein can enable concurrent communication scenarios (e.g., device designs) that were previously prohibited, infeasible, or unavailable at a given device size due to interference and throughput degradation associated with a particular receive path structure. The example T-switch usage described herein can further enable flexibility in the combination of specific frequency bands and carrier aggregation in a device that would otherwise have performance issues. In such devices, T-switches can improve throughput in cases with marginal interference and signal degradation (where throughput is reduced due to signal errors). Further details and specific implementations are described below.

[0056] Figure 1An example environment 100 including electronic device 102 is shown. In environment 100, electronic device 102 communicates with base station 104 via wireless communication link 106 (wireless link 106). In such an example, electronic device 102 is depicted as a smartphone. However, electronic device 102 can be implemented as any suitable computing or other electronic device, such as a cellular base station, broadband router, access point, cellular or mobile phone, gaming device, navigation device, media device, laptop computer, desktop computer, tablet computer, server, network-connected storage (NAS) device, smart appliance, vehicle-based communication system, Internet of Things (IoT) device, etc.

[0057] Base station 104 communicates with electronic device 102 via wireless link 106, which can be implemented as any suitable type of wireless link. Although depicted as a base station tower of a cellular radio network, base station 104 can be represented or implemented as another device, such as a satellite, cable television headend, terrestrial television broadcasting tower, access point, peer-to-peer device, mesh network node, router, fiber optic cable, or other typical electronic device. Therefore, electronic device 102 can communicate with base station 104 or another device via a wired connection, a wireless connection, or a combination thereof.

[0058] Wireless link 106 may include a downlink for transmitting data or control information from base station 104 to electronic device 102, and an uplink for transmitting other data or control information from electronic device 102 to base station 104. Wireless link 106 may be implemented using any suitable communication protocol or standard, such as 3GPP LTE, 3GPP 5GNR, IEEE 802.11, IEEE 802.16, Bluetooth. TM wait.

[0059] Electronic device 102 includes processor 108 and computer-readable storage medium 110 (CRM 110). Processor 108 may include any type of processor, such as an application processor or a multi-core processor, configured to execute processor-executable instructions (e.g., code) stored in CRM 110. CRM 110 may include any suitable type of data storage medium, such as volatile memory (e.g., random access memory (RAM)), non-volatile memory (e.g., flash memory), optical media, magnetic media (e.g., magnetic disk or magnetic tape), etc. In the context of this disclosure, CRM 110 is implemented to store instructions 112, data 114, and other information of electronic device 102, and therefore does not include transiently propagated signals or carrier waves.

[0060] Electronic device 102 may also include an input / output port 116 (I / O port 116) or a display 118. I / O port 116 enables data exchange or interaction with other devices, networks, or users. I / O port 116 may include a serial port (e.g., a Universal Serial Bus (USB) port), a parallel port, an audio port, an infrared (IR) port, etc. Display 118 may be implemented as a screen or projection displaying graphics (e.g., one or more graphic images) of electronic device 102, such as for a user interface associated with an operating system, program, or application. Alternatively or additionally, display 118 may be implemented as a display port or virtual interface through which graphical content of electronic device 102 can be transmitted or displayed.

[0061] For communication purposes, electronic device 102 also includes a modem 120, a wireless transceiver 122, and at least one antenna 130. The wireless transceiver 122 provides connectivity to a given network and other electronic devices connected thereto using radio frequency (RF) wireless signals. Alternatively or additionally, electronic device 102 may include a wired transceiver, such as an Ethernet or fiber optic interface, for communication over a personal or local network, intranet, or the Internet. The wireless transceiver 122 can facilitate communication over any suitable type of wireless network, such as a wireless local area network (LAN) (WLAN) (such as Wi-Fi or Bluetooth), a peer-to-peer (P2P) network, a mesh network, a cellular network (e.g., 3GPP2, 4G LTE, 5G NR, or other cellular networks), a wireless wide area network (WWAN) (e.g., based on 3GPP2, 4G LTE, 5G NR, etc.), a navigation network (e.g., the Global Positioning System (GPS) of North America or another Satellite Positioning System (SPS)), and / or a wireless personal area network (WPAN). In the context of example environment 100, wireless transceiver 122 enables electronic device 102 to communicate with base station 104 and the network connected thereto. Other figures referenced herein may relate to other wireless networks.

[0062] Modem 120 (such as a baseband modem) can be implemented as a system-on-a-chip (SoC) that provides a digital communication interface for data, voice, messaging, and other applications of electronic device 102. Modem 120 may also include a baseband circuitry for performing high-rate sampling processes, which may include analog-to-digital conversion (ADC), digital-to-analog conversion (DAC), gain correction, skew correction, frequency conversion, etc. Modem 120 may also include logic for performing in-phase / quadrature (I / Q) operations, such as synthesis, encoding, modulation, demodulation, and decoding. More generally, modem 120 can be implemented as a digital signal processor (DSP) or processor configured to perform signal processing to support communication via one or more networks. Alternatively, ADC or DAC operations may be performed by a separate component or another illustrated component (such as wireless transceiver 122).

[0063] Wireless transceiver 122 may include circuitry, logic, and other hardware for transmitting or receiving wireless signals in at least one communication frequency band. In operation, wireless transceiver 122 may implement at least one radio frequency transceiver unit to process data and / or signals associated with data transmitted via antenna 130 from electronic device 102. Typically, wireless transceiver 122 may include filters, switches, amplifiers, etc., for routing and processing signals transmitted or received via antenna 130. Typically, wireless transceiver 122 includes multiple transceiver units (e.g., for different wireless protocols, such as WLAN and WWAN, or for supporting different frequency bands or combinations of frequency bands).

[0064] In one example, the filters, switches, amplifiers, mixers, etc., of the wireless transceiver 122 may include at least one single-ended amplifier, a switching circuit system, at least one transformer, at least one differential amplifier, and at least one mixer. In some implementations, the single-ended amplifier, which amplifies the signal strength, is coupled to antenna 130. Therefore, in addition to increasing signal strength, the single-ended amplifier can also couple wireless signals to or from antenna 130. In some implementations, the switching circuit system can switchably couple individual transformers from a set of transformers to the single-ended amplifier. This set of transformers provides physical or electrical isolation between the single-ended amplifier and other circuitry of the wireless transceiver 122. The set of transformers also regulates the signal propagating through it. The outputs of the transformers can be coupled to one or more mixers. To isolate different receiver paths using different transformers and amplifiers, a T-switch can be implemented between the transformer and the mixer as described herein. An example of a T-switch is described in detail below.

[0065] Before the signal is input to the mixer, some examples may use a differential amplifier at the output of the transformer. In such examples, the differential amplifier amplifies the strength of the propagating signal, similar to a single-ended amplifier. The wireless transceiver may also perform frequency conversion using a synthesized signal and a mixer. The mixer may include an up-converter and / or a down-converter that performs frequency conversion in a single conversion step or through multiple conversion steps. The wireless transceiver 122 may also include logic (not shown) for performing in-phase / quadrature (I / Q) operations, such as synthesis, encoding, modulation, demodulation, and decoding using a synthesized signal.

[0066] In some cases, components of the wireless transceiver 122 or its transceiver unit 126 are implemented as separate receiver and transmitter entities. Alternatively or concurrently, the wireless transceiver 122 may be implemented using multiple or different parts to achieve corresponding receive and transmit operations (e.g., using separate transmit and receive chains). References below... Figure 2 An example implementation of transceiver unit 126 is described. Furthermore, different wireless protocols such as WWAN and WLAN can be implemented on separate chips or as separate systems-on-chips (SoCs). Thus, blocks such as modem 120 and transceiver 122 can represent more than one modem 120 or transceiver implemented together on a separate chip or a separate SoC.

[0067] Figure 2 An example of a wireless transceiver 122 is shown. In some examples, Figure 2 The components shown may be for reference. Figure 1Examples of some components of the described electronic device 102. A wireless transceiver 122 is coupled to one or more modems among a plurality of modems 120-1 to 120-m, where “m” represents a positive integer. The wireless transceiver 122 includes one or more transceiver units 126-1 to 126-n, where “n” represents a positive integer. Each of the one or more transceiver units 126-1 to 126-n may be associated with a different wireless protocol or a different frequency band. For example, transceiver unit 126-1 may be associated with a WWAN wireless protocol (e.g., 4G LTE, 5G NR, or other WWAN wireless communication protocols) and configured to transmit or receive using a specific set of frequency bands. Transceiver unit 126-n may be associated with a WLAN wireless protocol such as Wi-Fi (e.g., in the 2.4 GHz Wi-Fi band or in the 5 GHz Wi-Fi band). Alternatively, transceiver unit 126-n can be associated with a different set of frequency bands of the WWAN wireless protocol compared to transceiver unit 126-1. As shown, different transceiver units 126-1 to 126-n can be connected to different antennas 130 and 131, respectively. Alternatively, some transceiver units 126-1 to 126-n can share antenna 130 (e.g., via frequency duplexing or time duplexing, and routed via a duplexer / diplexer or using other signal splitting techniques). Furthermore, additional antennas (not shown) may be present for other transceiver units, used as diversity antennas, or for multiple-input multiple-output (MIMO) applications.

[0068] As part of the wireless transceiver 122, each transceiver unit 126-1 to 126-n is coupled to an associated converter unit (CU) 124-1 to 124-n. As shown at converter unit 124-1, each converter unit 124 may include an analog-to-digital converter (ADC) 218 ​​or a digital-to-analog converter (DAC) 250. As illustrated, transceiver unit 126-1 is coupled to modem 120-1 (e.g., via converter unit 124-1), and transceiver unit 126-n is coupled to modem 120-m. However, multiple transceiver units 126 may be coupled to the same modem 120. Although Figure 2Only certain components are explicitly shown, but wireless transceiver 122 may include other components not shown. Furthermore, converter units 124-1 to 124-n may be separable from wireless transceiver 122, such as by being part of modem 120. Modems 120-1 to 120-m may communicate with each other via communication pins (e.g., implementing a general-purpose input / output (GPIO) scheme). Data received and processed via modems 120-1 to 120-m may be passed to other parts of electronic device 102 (e.g., application processor, DSP, audio processor, etc.) for further processing.

[0069] Transceiver unit 126-1 includes a receiver 252 (or receive chain or receive path) and a transmitter 254 (or transmit chain). In some implementations, transceiver unit 126-1 may include a transmitter 254 (or transmit chain) without a receiver 252 (or receive chain), or vice versa. Receiver 252 includes a low-noise amplifier 204 (LNA 204) for downconversion, a filter 206, and a mixer 208. Transmitter 254 includes a power amplifier 256 (PA 256) for upconversion, a filter 258, and a mixer 260. However, transceiver unit 126-1 may include other components, such as additional amplifiers or multiple mixers, which may be located anywhere along the depicted receive and transmit chains. These example components may at least partially implement the radio frequency front-end (RFFE) of the associated electronics 102. Receiver 252 is coupled between the antenna and ADC 218, for example, via the low-noise amplifier 204 and the mixer 208, respectively. Transmitter 254 is coupled between the antenna and DAC 250, for example, via power amplifier 256 and mixer 260, respectively.

[0070] Therefore, as shown for receiver 252 of transceiver unit 126-1, the antenna is coupled to low-noise amplifier 204, and low-noise amplifier 204 is coupled to filter 206. Filter 206 is coupled to mixer 208, and mixer 208 is coupled to ADC 218. ADC 218 is coupled to modem 120-1, or is part of modem 120-1. Example signal reception operation of receiver 252 and antenna including transceiver unit 126-1 is described below. In some implementations, different transceiver units are associated with different wireless communication technologies (such as WWAN or WLAN). Alternatively or concurrently, different transceiver units can provide parallel processing capabilities for the same wireless communication technology.

[0071] As part of the signal transmission operation, the baseband digital signal is provided to a digital-to-analog converter 250 (DAC 250). DAC 250 converts the digital signal into an analog signal provided by mixer 260. Mixer 260 performs frequency conversion on the analog signal to upconvert from one frequency to a higher frequency, such as upconverting from the baseband frequency to an intermediate frequency (IF) or radio frequency (RF). Mixer 260 can perform upconversion in a single conversion step or through multiple conversion steps. Therefore, mixer 260 performs upconversion on the analog signal to generate an upconverted signal and provides the upconverted signal to filter 258. Filter 258 filters the upconverted signal by attenuating certain frequency ranges (e.g., a low-pass filter or a band-pass filter) to produce a filtered signal with one or more attenuation bands. Filter 258 provides the filtered signal to power amplifier 256.

[0072] Similarly, as part of the signal reception operation, the baseband digital signal received via the system described above can be processed and output for further processing 262 via an analog-to-digital converter (ADC 218) and (multiple) modems 120. As an example signal reception operation, antenna 130 can receive signals processed via an LNA and filter 206. Mixer 208 downconverts the analog signal from an IF or RF signal to a baseband signal. The ADC 218 then processes the baseband signal to generate a digital signal provided to (multiple) modems 120, which is then output for further processing 262. Similar operations can be performed using any number of antennas (such as antenna 131) and any number of TRX units 126, as well as corresponding CUs 124 and modems 120.

[0073] Power amplifier 256 amplifies the filtered signal to produce an amplified signal with a power level suitable for transmission. Amplifier 256 provides the amplified signal to antenna 130.

[0074] Figure 3 This is a schematic diagram illustrating another example of a wireless transceiver section, which is shown as a receive path 352 (e.g., in receiver 252 of transceiver 122). Figure 3 The wireless transceiver section includes an alternative receiver path 352. From left to right, the circuitry 304 (e.g., the input to an RxSM) leads to at least one antenna, such as... Figure 1 and Figure 2Antenna 130. Circuit system 304 is coupled to amplifier 306, which may be a single-ended low-noise amplifier. Amplifier 306 is coupled to transformer 310 via switching circuit system 308. Although path 352 shows a single path, additional paths using a portion of receiver path 352 may also exist as part of a larger circuit (e.g., receiver circuit 400 and / or switch matrix, as described below), where the active path is controlled by one or more switches (e.g., switches such as those in switching circuit system 308). Transformers or balun circuit elements may be used in the above locations to convert signals from single-ended to differential. As described below, in a device where the T-switch is single-ended and combined with the input from a single-ended LNA to the output of the single-ended T-switch, the transformer may be omitted. Such an example relates to... Figures 8 to 10 A more detailed description follows. Transformer 310 is coupled to switching circuit system 600, which can be a T-switch as described in various implementations below. Therefore, switching circuit system 600 is coupled to circuit system 360, which may include an amplifier or other such circuit system, and circuit system 360 is coupled to mixer 390. In some examples, circuit system 360 is optional and may be omitted. Although Figure 3 Not shown, but multiple distinct receiver paths, including receiver path 352 and other receiver paths, may include a single shared mixer 390. Switching circuitry system 600 can be configured to increase isolation between receiver path 352 and other receiver paths coupled to mixer 390 to improve the performance of the transceiver including receiver path 350. Mixer 390 is coupled to filter 392 via output 394. Output 394 of filter 392 leads to an analog-to-digital converter (ADC), such as... Figure 2 The analog-to-digital converter 132-1.

[0075] As shown in the figure, transformer 310 converts a single-ended signal into a differential signal in receive path 352. Using transformer 310, a portion of receive path 352 on the left side of transformer 310 is a single-ended portion, while another portion on the right side of transformer 310 is a differential portion. In receive paths different from receive path 352 (e.g., for different frequencies or standard communication implementations), the components in the different receive paths correspond to the corresponding frequency bands and are configured to process signals of the corresponding frequency bands. Depending on a given design, different paths may be similar to receive path 352 or have different configurations.

[0076] Figure 4AVarious aspects of the receiver circuit 400 are illustrated. The receiver circuit 400 may include multiple implementations of differential T-type switches with a receiver circuit switch matrix (RxSM). The receiver circuit 400 may be part of a wireless transceiver implementation and may include multiple receive paths to handle communications in multiple different communication frequency bands. As shown, for illustrative purposes only, the receiver circuit 400 is divided into four parts or quadrants, shown as the upper left quadrant of the first frequency band packet input circuit system 419, the lower left quadrant of the second frequency band packet input circuit system 469, the upper right quadrant of the first frequency band packet downlink connection circuit system 420, and the lower right quadrant of the second frequency band packet downlink connection circuit system 470. Different frequency band packets may be constructed around isolating certain groups of communication frequency bands (e.g., low frequency bands, mid-high frequency bands, etc.), but can still be configured for communication between packets. As shown, the input of the receiving circuit 400 can be received and fed into amplifiers in input circuit systems (e.g., circuit systems 419 and 469) in different ways, and can also be routed to different transformers in connecting circuit systems 420 and 470 in different ways. Connecting circuit system 420 or connecting circuit system 470 routes the signal to a downlink channel (DLP) or downlink path (e.g., a receive path) via transformers and mixers, depending on the specific frequency band or type of communication signal being processed.

[0077] Receiver circuit 400 is an example with a specific receive path, but a receiver circuit may include additional paths and circuitry for additional frequency band groups. As described herein, certain frequency band groups (particularly for lower frequency band groups) may not have isolation issues. In such cases, the T-switch described herein can be implemented for certain higher frequencies in some examples, where the T-switch sufficiently improves isolation, justifying the trade-off in increased circuit size and complexity. In some examples, the described T-switch can be used for both higher and lower frequencies. In some examples, each such different frequency path using a T-switch can be implemented in a single receiver circuit switch matrix, such that, according to the aspects described herein, a single circuit may include one or more T-switches.

[0078] The receiving path of the receiving circuit 400 includes a first receiving path 401 and a second receiving path 451. Figure 4BThe second receive path 451 and the region where the first receive path 401 and the second receive path 451 are combined to connect to the mixer 490 are emphasized. Therefore, as shown, the first receive path 401 begins at the first band packet input circuitry 419 and can be switched to connect to the second band packet downlink path connection circuitry 470. The second receive path 451 begins at the second band packet input circuitry 469 and, as shown, is configured to connect to the second band packet downlink path connection circuitry 470. Figure 4A As shown, the first input portions of these two paths include switching circuitry systems to allow connection to other portions of the downlink path connection circuitry systems. In the path configuration shown, the first receive path 401 includes switching circuitry system 600-1, and the second receive path 451 includes switching circuitry system 600-2. After the switching circuitry system of each path, the paths are merged, and both include a mixer 490. The mixer 490 is connected via the switching circuitry systems to a specific path among the multiple receive paths of the receive circuitry 400. When one of the two paths 401 and 451 is in use, switching circuitry systems 600-1 and 600-2 allow the two paths 402 and 451 to be isolated from each other. For example, when the first receive path 401 is in use, switching circuitry system 600-1 can be configured to transmit data to mixer 490, and switching circuitry system 600-2 can be configured to isolate the input portion of the second receive path 451 from mixer 490. Accordingly, when the second receive path 451 is in use, the switching circuit system 600-2 can be configured to pass a signal to the mixer 490, and the switch 600-1 can be configured to isolate any signal received at the input portion of the first receive path 401 from the mixer 490. Furthermore, as shown, the switching circuit system described herein can be used not only to isolate a path from a shared mixer (e.g., mixer 490 shared by the first receive path 401 and the second receive path 451), but also to select between two different mixers on a path (e.g., mixer 491 and mixer 490 for the first receive path 401). As shown in the figure, switching circuit system 600-1 and switching circuit system 600-3 can be used in the first receiving path 401 to determine whether a signal along the first receiving path is sent to mixer 490 (e.g., where circuit system 600-1 is closed and circuit system 600-3 is open) or sent to mixer 491 (e.g., where circuit system 600-3 is closed and circuit system 600-1 is open).

[0079] Figure 5This diagram illustrates an example implementation of two receive paths 401 and 451 coupled to the same mixer 490, which may include an implementation of a differential T-switch. As shown in the figure, Figure 5 The two paths 401 and 451 are Figure 4A and Figure 4B The implementation of the first receiving path 401 and the second receiving path 451. For example... Figure 4A , Figure 4B and Figure 5 As shown, receiving paths 401 and 451 are similar, but have different components to handle different frequency bands or types of RF signals. The first receiving path 401 includes a receiving input 402 that receives signals from an antenna (e.g., antenna 130 or any other such antenna). In some examples, paths 401 and 451 include a signal conditioning circuitry. In other examples, such a signal conditioning circuitry may include filters and other circuitry elements. The signal from the receiving input 402 is then fed to a low-noise amplifier 406. Figure 4A and Figure 4B In some of the examples shown, a switch may be included before the amplifier in some receiving paths (e.g., before amplifier 406). Similarly, different receiving paths may have different switching circuitry systems at the output of amplifier 406, such as switching circuitry system 408, to guide the signal from receiving input 402 based on the current communication standard and the signal band associated with the input signal. Switching circuitry system 408 has a first switching connection (e.g., input) and a second switching connection (e.g., output). The second switching connection is coupled to the input of transformer 410, and the first switching connection is coupled to LNA 406. Transformer 410 (e.g., it may be a balun) changes the input signal from a single-ended signal (e.g., between the communication path and a reference potential) to a differential signal at the output of transformer 410. In some examples, capacitor circuitry system 412 is included. In other examples, capacitor circuitry system 412 may be integrated with the switching circuitry system of the path (e.g., switching circuitry system 600-1 or switching circuitry system 600-2). In some examples, capacitor circuit system 412 may include a capacitor bank, or any other capacitive element configurable for receiving and processing (e.g., for tuning, matching, etc.) a specific signal by which the first receiving path 401 is specifically set. In some examples, the capacitor bank may be a set of selectable capacitors. In other examples, the capacitor bank is a tunable capacitive element. Switching circuit system 600-1 is an implementation of a T-switch as detailed below. The control input settings of switching circuit system 600-1 (e.g., control input at...) Figure 5(Not shown in the diagram), switching circuit system 6001 connects the received signal to mixer 490 or isolates the first receiving path 401 from mixer 490. Similarly, as shown with respect to mixer 491, switching circuit system 600-1 can be used in conjunction with switching circuit system 600-3 to direct the received signal from the output of transformer 410 to mixer 490 or mixer 491. In a receiver circuit such as 400 (e.g., which may include multiple paths, such as...), the receiving circuit 400 can be used to direct the received signal from the output of transformer 410 to mixer 490 or mixer 491. Figure 5 In receiving circuits such as the path shown, different combinations of T-type switches can be used as part of enhanced isolation or as the direction of the received signal along a selected branch (e.g., between mixer 491 and mixer 490) that is part of the receiving path.

[0080] The second receiving path 451 is shown as a mirror image of the first receiving path 401 with a shared mixer 490. As described above, the switching and specific component characteristics may differ from the circuit element characteristics of the first receiving path 401 in order to configure the receiving path to process specific signals of a specific frequency band or a certain communication protocol. As shown, the second receiving path 451 includes a receiver input 452, a circuit system 454, an amplifier 456, a switching circuit system 458, a transformer 460, and a capacitor circuit system 462, which operate similarly to the corresponding elements of the first receiving path 401 described above. The switching circuit system 600-2 includes a separate implementation of a T-switch for connecting or isolating the second receiving path 451 to the mixer 490, as a complement to the switching circuit system 600-1. Figure 6 and Figure 7A Details of a T-type switch that can be used in switching circuit systems 600-1 and 600-2 are shown. Figure 7B and Figure 7C The operation of switches (e.g., switch circuit system 600-1 and switch circuit system 600-2) connecting or isolating paths (e.g., connecting or isolating path 401 or path 451 from mixer 490) is illustrated.

[0081] Figure 6 This is a block diagram of a switching circuit system 600. As shown, the switching circuit system 600 is a split-type differential T-switch according to some examples described herein. Figure 5 In some implementations of receive path 401 and receive path 451, each instance of switch circuit system 600-1 and switch circuit system 600-2 is Figure 6 A copy of the switching circuit system 600. In other examples, a specific implementation of the switching circuit system (e.g., a specific transistor, circuit elements with specific design values, etc.) can be used as an implementation of a T-switch in different devices. Figure 6In the T-shaped switch block diagram of the switch circuit system 600 shown, the first differential switch 610 and the second differential switch 620 can be considered as a dual switch or a split switch, wherein switch 610 forms the upper left side of the T-shaped structure and switch 620 forms the upper right side of the T-shaped structure. The first shunt capacitor 650 forms the base of the T-shaped structure.

[0082] The first differential switch 610 has a first differential input 609, a first differential output 611, and a control input 614. The first differential input 609 has a first input 607 and a second input 608. The first differential output 611 has a first output 612 and a second output 613. Similarly, the second differential switch 620 has a second differential input 619, a second differential output 621, and a control input 624. The second differential input 619 has a first input 617 and a second input 618, and the second differential output 621 has a first output 622 and a second output 623. The first differential input 609 serves as the input to the T-type switching circuit system 600, and the second differential output 621 serves as the output of the switching circuit system 600. Between the two differential switches 610 and 620 (which can also be considered as the two ends of a split switch), the first differential output 611 is coupled to the second differential input 619. The connection is configured such that a matched first output 612 of the first differential output 611 is coupled to a first input 617 of the second differential input 619. Similarly, a second output 613 of the first differential output 611 is coupled to a second input 618 of the second differential input 619.

[0083] Control inputs 614 and 624 provide control signals to the first differential switch 610 and the second differential switch 620 to place the switching circuit system 600 in an open or closed position. These control inputs 614 and 624, as well as any additional control inputs described herein, can receive signals from a control circuit system. The control circuit system may be part of the microprocessor 1212, or any other such processing circuit system of the electronic device 1202 described below, or any similar device having a processing circuit system configured to send control signals to the switching circuit system. In the closed position, the switching circuit system 600 is designed to pass a signal from the first differential input 609 to the second differential output 621. In the open position, the switching circuit system 600 is designed to prevent any signal at the first differential input 609 from being passed out of the second differential output 621 (e.g., isolating input 609 from output 621). Partial isolation comes from the individual differential switches providing isolation; therefore, when a disconnect signal is received at control input 614, the first differential switch 610 attempts to isolate the first differential input 609 from the first differential output 611. The second differential switch 620 isolates the second differential input 619 from the second differential output 621. When isolation is effective, linking multiple switches together can increase overall isolation.

[0084] In some physical implementations of differential switches, the physical structure and characteristics vary based on the frequency of the signal processed by the switch. As described in more detail below, parasitic capacitance is an inherent part of the physical construction of some differential switch elements, and this parasitic capacitance can reduce the effectiveness of the switch at higher frequencies. In such implementations, the first differential switch 610 and the second differential switch 620, operating independently without capacitor 650, the first shunt switch 630, and the second shunt switch 640, can provide effective isolation at lower frequencies. In some implementations, the first differential switch 610 and the second differential switch, operating independently, cannot provide effective isolation at higher frequencies. In some devices, such as receiver circuit 400, differential switches may be required even for higher frequency receiver paths due to cost, size, or other implementation factors.

[0085] To address the aforementioned issues, a shunt capacitor 650 can be added as part of the switching circuit system 600 to increase the isolation between the first differential input 609 and the second differential output 621, even when the isolation between the inputs and outputs of the individual differential switches 610 and 620 is insufficient. Furthermore, in some aspects, a first shunt switch and a second shunt switch 640 can be provided to further increase the isolation between the first differential input 609 and the second differential output 621.

[0086] The first shunt switch 630 has an input 631, an output 632, and a control input 633. The second shunt switch 640 has an input 641, an output 642, and a control input 643. The shunt switch 630 is coupled to the differential switch 610 across the differential control input 614. The shunt switch 640 is coupled to the differential switch 620 across the control input 624. As described below, the shunt switches 630 and 640 receive and shunt leaked signals across the control inputs (e.g., at the gate of the transistor described below) to increase isolation between paths. In some examples, the complete structure of the switching circuit system 600 can then be described as follows.

[0087] The switching circuit system 600 can be considered as a wireless communication device with a first differential switch 610, which has a first differential input 609, a first differential output 611 and a first control input 614.

[0088] The switching circuit system 600 also includes a second differential switch 620, which has a second differential input 619, a second differential output 621, and a second control input 624 connected to the first differential output 611.

[0089] The switching circuit system 600 includes a shunt capacitor 650 coupled between a first output 612 and a second output 613 of the first differential output 611. Similarly, a shunt capacitor 610 is coupled between a first input 617 and a second input 618 of the second differential input 619.

[0090] The switching circuit system 600 includes a first shunt switch 630, which has a third control input 633, a third input 631, and a third output 632. The third input 631 and the second output 632 are coupled across a control input 614 of a differential switch 610.

[0091] The switching circuit system 600 also includes a second shunt switch 640, which has a fourth control input 643, a fourth input 641, and a fourth output 642. The fourth input 641 and the fourth output 642 are coupled across the control input 624 of the differential switch 620.

[0092] During operation, the first differential input 609 can receive signals from other parts of the receiving path (e.g., from a transformer such as transformer 410 or transformer 460), and the second differential output 621 can be coupled to a mixer (e.g., mixer 490) or other such receiving path elements. The switching circuit system 600 operates to connect or isolate signals along the receiving path of a specific implementation of the switching circuit system (e.g., switching circuit system 600-1 and switching circuit system 600-2), of which a particular implementation is part. In each implementation of the switching circuit system 600, when the first differential switch 610 and the second differential switch 620 are set to the closed setting, control input 633 is used to set the first shunt switch 630 to the open setting, and control input 643 is used to set the second shunt switch 640 to the open setting. Conversely, when the first differential switch 610 and the second differential switch 620 are set to the open setting, various control inputs are used to set the first shunt switch 630 and the first shunt switch 640 to the closed setting. At higher frequencies, leakage signals from the first input 607 of the first differential input 609 to the first output 612 of the first differential output 611 are available at the first input of the control input 614. Similarly, leakage signals from the second input 608 of input 609 to the second output 613 of output 611 are available at the second input of the control input 614. A shunt switch 630 can be connected across the leakage differential signals so that these signals largely cancel each other out. The same operation can be used with a shunt switch 640 to eliminate any residual leakage current remaining at the control input 624 of the differential switch 620. When shunt switches 630 and 640 are configured for closed-loop operation, a shunt capacitor 650 and shunt switches 630 and 640 operate to increase the isolation of the switching circuit system 600 by canceling out the signals across the first differential switch 610. As described above, the physical properties of the materials used to implement the switching circuit system 600 may result in less effective physical isolation due to parasitic electrical effects. The significance of isolation can be increased by eliminating signals, including any signals transmitted via parasitic electrical components.

[0093] Furthermore, for some implementations of the switching circuit system 600 in the surrounding circuitry along with other capacitor circuit systems, capacitor 650 can be designed in conjunction with the capacitor circuit system between the first differential input 609 and the transformer (e.g., capacitor circuit system 412 and transformer 410 or capacitor circuit system 462 and transformer 460) for an efficient implementation of the switching circuit system 600 in a given receive path. This efficiency is due to capacitor 650 being connected in parallel with previous capacitor circuit systems in the same receive path. The structure of the switching circuit system 600 allows capacitor 650 to have a dual function: improving isolation as a shunt circuit when the switching circuit system 600 is configured for isolation, and supplementing capacitor circuit system 462 when the switching circuit system 600 is configured to transmit signals. In some examples, the size of the capacitor circuit systems (e.g., capacitor circuit systems 412 or 462) in the receive path can therefore be reduced by the same or similar amount as the size of capacitor 650, thereby effectively utilizing space in the device including the switching circuit system 600 and improving the isolation performance of the receive channel including the switching circuit system 600.

[0094] The aforementioned structure of the switching circuit system 600 improves isolation performance compared to direct (e.g., dual or multiple) switching without a combined shunt (which only results in a few dB of isolation at high frequencies of signal harmonics), while balancing the trade-off between switching losses and isolation, which ultimately limits isolation, such as at higher frequencies. The capacitor 650 works in conjunction with the shunt switch to improve isolation and address the reliability issues of the shunt switch. Particularly for differential embodiments, differential oscillation may exceed permissible limits, and the inclusion of the capacitor 650 can address the design problem of differential oscillation exceeding permissible limits. Furthermore, the capacitor 650 addresses reliability issues in a way that high-Vt devices do not, as high-Vt devices add additional parasitic effects and further degrade performance. In contrast, the use of shunt capacitors such as capacitor 650 can complement the design and be incorporated as part of the tuning capacitor bank for signal lines (e.g., capacitor circuit systems 412 or 462). Shunt capacitors can also provide additional shunt paths between two signal lines or between a signal line and a reference potential (e.g., ground) to attenuate harmonics at higher frequencies without the reliability issues associated with the aforementioned differential oscillation. For various implementations, such as inclusion in receiver circuits like receiver circuit 400, the use of the T-switch described herein can thus enable different receiver path ports and band sharing for the downlink path, reducing associated circuit area usage. The T-switch can also enable concurrent scenarios previously prohibited or unusable due to interference and throughput degradation associated with specific receiver path configurations. Therefore, the T-switch provides flexibility for specific band and carrier aggregation combinations for devices that would otherwise suffer performance problems. The T-switch can also improve throughput in cases with marginal interference and signal degradation (where throughput is reduced due to signal errors).

[0095] While the use of one or more shunt switches can address reliability issues and improve performance, as mentioned above, some examples can be achieved without shunt switches. Figure 6 Such an example would include differential switches 610 and 620 with capacitor 650 in the same configuration, but would omit shunt switches 630 and 640 (e.g., where the input and output connections of switches 630 and 640 are disconnected, so only the connection between the first and second inputs of the differential path between the two differential switches is capacitor 650). Such an implementation reduces complexity and area usage, while slightly reducing isolation. Such an example T-switch can be used to improve the device in implementations where reliability is addressed elsewhere in the circuit or within the device. Below Figure 7A The corresponding implementation without a shunt switch will exclude transistors 730 and 740, and will also eliminate the control input 731 coupled to the gate of these transistors.

[0096] Figure 7A This is a schematic diagram illustrating an example implementation of a differential T-type switch, shown as a switching circuit system 700, according to some examples described herein. As shown, the switching circuit system 700 can be an implementation of the switching circuit system 600. Comparing the switching circuit system 700 to the switching circuit system 600, the first transistor 710 and the second transistor 715 correspond to the first differential switch 610. The fourth transistor 720 and the fifth transistor 725 correspond to the second differential switch 620. The third transistor 730 corresponds to the first shunt switch 630, the sixth transistor 740 corresponds to the second shunt switch 640, and the capacitor 750 corresponds to the capacitor 650. Figure 7A In the implementation shown, each transistor can be implemented as an N-type metal-oxide-semiconductor field-effect transistor (MOSFET), as illustrated in the included transistor diagram. In other implementations, different transistors and fabrication techniques (e.g., P-type or others) may be used. The transistors act as switches controlled by signals received at the gate of each transistor.

[0097] The input to the switching circuit system 700 is a differential input 709 spanning the sources of the first transistor 710 and the second transistor 715 (e.g., the first input 707 of the differential input 709 is the source of the first transistor 710, and the second input 708 of the differential input 709 is the source of the second transistor 716). Similarly, the differential output 721 spans the drains of the fourth transistor 720 and the fifth transistor 725 (e.g., the first input 722 of the differential output 721 is the drain of the fourth transistor 720, and the second input 723 of the differential output 721 is the drain of the fifth transistor 725).

[0098] The above description of the switching circuit system 600 can be used to further describe the switching circuit system 700 as follows. The switching circuit system 700 is configured such that the first differential switch 610 includes a first transistor 710 and a second transistor 715. The first input 607 of the first differential input 609 includes the source of the first transistor 710. The second input 608 of the first differential input 609 includes the source of the second transistor 715. The first input 612 of the first differential output 611 includes the drain of the first transistor 710. The second output 613 of the first differential output 611 includes the drain of the second transistor 715. A first control input 614 corresponds to control input 713 and control input 714, and includes the gate of the first transistor 710 and the gate of the second transistor 720.

[0099] The switching circuit system 600 can also be implemented using the switching circuit system 700, wherein the first shunt switch 630 includes a third transistor 730 having a drain coupled to the gate of the first transistor 710 and a source coupled to the gate of the second transistor 715. The second control input 633 and the third control input 643 correspond to control input 731, which includes the gate of the third transistor 730 and is coupled to the gate of the sixth transistor 740.

[0100] The switching circuit system 600 can also be implemented using the switching circuit system 700, wherein the second differential switch 620 includes a fourth transistor 720 and a fifth transistor 725. The first input 617 of the second differential input 619 includes the source of the fourth transistor 720. The second input 618 of the second differential input 619 includes the source of the fifth transistor 725. The first input 722 of the second differential output 721 includes the drain of the fourth transistor 720. The second input 723 of the second differential output 721 includes the drain of the fifth transistor 725. The fourth control input 624 corresponds to control inputs 733 and 734. When the switching circuit system 600 is implemented as the switching circuit system 700, the fourth control input 633 includes the gate of the fourth transistor 720 and the gate of the fifth transistor 725.

[0101] The switching circuit system 600 can also be implemented using the switching circuit system 700, wherein the second shunt switch 640 includes a sixth transistor 740 having a drain coupled to the gate of a fourth transistor 720 and a source coupled to the gate of a fifth transistor 725. Then, a third control input 643 corresponds to a control input 731 bonded to a control input 633, which also includes the gate of the sixth transistor 740.

[0102] In some examples, control inputs 713, 714, 733, and 734 are the corresponding gates of the first transistor 710, the second transistor 715, the fourth transistor 720, and the fifth transistor 725. The gates of the third transistor 730 and the sixth transistor 740 are bonded together and connected to control input 731. Figure 7B and Figure 7CAs shown, the switching circuit system therefore operates under control inputs 713, 714, 733, and 734 in the opposite signal states to control input 731, such that when transistors 730 and 740 are off, transistors 710, 715, 720, and 725 are on, and when transistors 730 and 740 are on, transistors 710, 715, 720, and 725 are off. While specific examples of drain, gate, and source connections have been described above, other implementations with different transistor types (e.g., p-type or n-type transistors) may have different terminal connections, such that, alternatively, the aforementioned source or drain (e.g., terminal) connections can be adjusted to achieve the same function corresponding to a particular transistor type.

[0103] Figure 7B This is a functional diagram of a differential T-switch with a first control setting based on some examples described herein. Figure 7B In the first control setting shown, the switching circuit system 700 is configured for an off setting (e.g., minimizing the output signal 791 transmitted from input 709 to output 721 when input signal 790 is present). In the first control setting, the first differential switch is in an off setting 783, and the second differential switch is in an off setting 785, while the shunt switch is in a closed state 784. The first differential switch off setting 783 corresponds to the cutoff voltage of transistors 710 and 715 at control inputs 713 and 714. The second differential switch off setting 785 corresponds to the cutoff voltage of transistors 720 and 725 at control inputs 733 and 734. The shunt switch closed state 784 corresponds to the on setting at control input 731, which is bonded to the gates of both transistors 730 and 740.

[0104] As described herein, "high frequency" refers to the frequency at which a parasitic signal path carries a signal sufficient to interfere with the operation of the device (e.g., a frequency with a large parasitic effect or that affects the device's functionality). In some examples, a high frequency threshold may occur when the output signal across the parasitic signal path in the switch is greater than a threshold when the switch is in the open position, or when the signal transmitted across the parasitic signal path when the switch is in the open position is greater than a threshold percentage or threshold fraction of the signal transmitted across the non-parasitic path when the switch is in the closed position. Similarly, low frequency, as described herein, is the frequency at which a parasitic signal path has a small effect on the operation of the device. Therefore, the high and low frequencies described herein are device-specific based on the characteristics of the components in the device, particularly the parasitic values ​​of a given component arranged in a particular device. For low frequencies (e.g., frequencies where the parasitic effect is small relative to the circuit element), the input signal 790 is isolated by being disconnected by a differential switch. However, at high frequencies (e.g., once the parasitic value increases due to the circuit characteristics at a given frequency due to the physical capacitor performance), the parasitic capacitance across transistors 710, 715, 720, and 725 (e.g., parasitic signal path 799) allows a large high-frequency input signal 790 to pass through the switching circuit system 700 to create a large output signal 791, where isolation increases performance. By including a closed path for the shunt switch in the shunt switch closed configuration, the high-frequency signal in the parasitic capacitance is directed through a differential path, so that the signal is largely canceled out on the three shunt paths, rather than being transmitted as part of the output signal 791. When the shunt switch is in the closed state 784, any signal along the parasitic signal path 799 is reduced at the gates of the first and second switches, thereby significantly reducing leakage. The added shunt path provides significant isolation even at high frequencies, where the output signal 791 has a correspondingly lower amplitude (e.g., ideally 0 for complete isolation). In a single-ended embodiment, the parasitic signal path is attached from the gate of the transistor to a reference potential (e.g., ground) to provide similar signal cancellation for the corresponding parasitic signal path.

[0105] Figure 7C This is a functional diagram of a differential T-switch operating under a second control setting, based on some examples described herein. Figure 7CIn the second control configuration shown, the switching circuit system 700 is configured for a closed configuration (e.g., transmitting the input signal 790 as output signal 792 from input 709 to output 721). In the second control configuration, the first differential switch is in a closed configuration 786, and the second differential switch is in a closed configuration 788, while the shunt switch is in an open configuration 787. The first differential open / close configuration 786 corresponds to the on-state voltages of transistors 710 and 715 under control inputs 713 and 714. The second differential open / close configuration 788 corresponds to the on-state voltages of transistors 720 and 725 under control inputs 733 and 734. The shunt switch closed configuration corresponds to the offset at control input 731 bonded to the gates of both transistors 730 and 740. The capacitor path 779 and the parasitic capacitance across the shunt switch when it is in an open configuration can sometimes affect the input signal 790. This effect can cause the output signal 792 to differ from the case where the input signal 790 is transmitted via a closed transmission line in certain situations. The implementation of the switching circuit system 700 (e.g., as an implementation of the receiving circuit 400) can eliminate (e.g., compensate) any degradation in signal quality caused by the switching circuit system 700. Similarly, when the switching circuit system 700 is used as described above... Figure 7B When operating in the first control setting described herein, any associated signal quality degradation at output signal 792 can be offset by increased isolation, thereby improving signal quality along other receiving paths through increased isolation.

[0106] Switching circuit system 600 and switching circuit system 700 can be implemented as standalone wireless devices, or within the context of a larger wireless device, to improve device performance by increasing isolation between signal paths (e.g., reception paths). In some implementations, this includes, for example... Figure 6 First differential switch 610, second differential switch 620, shunt capacitor 650, first shunt switch 630 and second shunt switch 640 or Figure 7AThe T-switch (e.g., switch circuit system 600 or switch circuit system 700) of the corresponding transient element is part of the first receive path of the receive switch matrix (RxSM). In other examples, these may be part of a system-on-chip (SoC) transceiver, a transceiver unit with transmit and receive paths, an RF front-end module, a mobile phone with a touchscreen, a wireless device with an antenna, or any other such device. In addition to the T-switch circuit system elements described above, some such devices may include a mixer (e.g., a mixer of the RxSM) coupled to a second differential output 621 or output 721 of the second differential switch 620. Such devices may also include a second receive path (e.g., a second receive path of the RxSM) in which the second differential output of the second differential switch is coupled to the output of the second receive path, and in which the first receive path also includes a low-noise amplifier (LNA) whose output is coupled to a first differential input, such as input 609 or input 709.

[0107] Some such examples may also include a transformer having a transformer differential output coupled to a first differential input (such as input 609 or input 709), similar to the examples above. Figures 3 to 5 The system described herein. Some such examples may also include capacitor banks, such as capacitor circuit system 412 or capacitor circuit system 462, coupled across the transformer differential output (e.g., and inputs, such as input 609 or input 709 of a switching circuit system).

[0108] Various such examples may include multiple receive paths that can be reconfigured to support multiple communication bands of multiple communication protocols or standards, wherein a first receive path may be isolated from a second receive path in multiple receive channels using a split differential T-switch.

[0109] The switching circuit system can operate as described above, wherein the control circuit system is coupled to the control input. In one example, the control circuit system is configured to deselect the first and second control inputs while selecting the third and fourth control inputs to disconnect the first differential switch 610 and the second differential switch 620, and simultaneously close the first shunt switch 630 and the second shunt switch 640 to isolate the first differential input 609 from the second differential output 621. In some such examples, the control circuit system is configured to select the first control input 614 and the second control input 624 while deselecting the third control input 633 and the fourth control input 643 to close the first and second differential switches, and simultaneously disconnect the first and second shunt switches to couple the first differential input 609 to the second differential output 621.

[0110] As described above, transformers (such as transformer 410 and / or transformer 460, and other transformers in the RxSM) can be used to implement a single-ended portion of the receiver path separated from the differential portion of the receiver path by the transformer. In some examples, unlike using the differential portion of the receiver path, the single-ended portion of the receiver path may have the isolation issues described above (e.g., switching circuit systems 408 and 458, or a receiver path without a differential portion). In such a path, a single-ended version of the aforementioned switching circuit system can be implemented. The following... Figure 8 and Figure 9 Describe single-ended versions of switching circuit system 600 and switching circuit system 700, wherein a reference potential (e.g., ground) plane exists along with the signal path instead of the differential signal path.

[0111] In some respects, the above-described structure can be used with a single shunt switch, or it can be used without a shunt switch. Such an example can be used when capacitor 650, or capacitor 650 having one of the shunt switches shown (e.g., switch 630 or switch 640), provides sufficient isolation across the switching circuit system 600 (e.g., between the first differential input 608 and the second differential output 621). One such aspect is a device comprising: a first differential switch having a first input and a second input, a first output and a second output, and a control input; a second differential switch having a first input and a second input coupled to the respective first and second outputs of the first differential switch, the second differential switch also having a first output and a second output, and a control input; and a shunt capacitor coupled between the first and second outputs of the first differential switch, the shunt capacitor also coupled between the first and second inputs of the second differential switch. An additional such aspect may have a single shunt switch positioned at the first or second differential switch to improve isolation when the device is configured to be in an open setting. Another such aspect could be… Figure 7A The switching circuit system 700, however, removes either or both of the third transistor, the sixth transistor 740, to create a structure with less isolation, but with less area and power usage due to the fewer number of transistors.

[0112] Figure 8A block diagram of a single-ended T-switch, based on some examples described herein, is shown as a switching circuit system 800. In the switching circuit system 800, the second input of the differential signal path (e.g., the second input 608 of input 609 and the second output 623 of the second output 621) is replaced by a reference potential 899. The reference potential 899 may be ground or any other such reference potential. The transmission path of the switching circuit system 800 begins at input 809, travels between the first switch 810 and the second switch 820 on a path from output 811 to input 819, and ends at output 821, where this path will be connected to other circuit systems depending on the specific implementation. As described above with respect to the differential embodiment, the first switch 810 is controlled by control input 814, and the second switch 820 is controlled by control input 824. Due to parasitic capacitance limiting isolation at higher frequencies, shunt capacitor 850, shunt switch 830, and shunt switch 840 are included across signal path 898 to reference potential 899. Shunt switch 830 is connected to signal path 898 at input 831 and to reference potential at output 832, with its operating settings managed by the voltage at control input 833. Shunt switch 840 is connected to signal path 898 at input 841 and to reference potential at output 842, with its operating settings managed by the voltage at control input 843. As with the differential implementation, when the first and second shunt switches 840 are closed as part of a disconnect control setting of circuit system 800, the first switch 810 and the second switch 820 are open to isolate output 821 from input 809. When the first and second shunt switches 840 are open as part of a second control setting of circuit system 800, the first switch 810 and the second switch 820 are closed to provide a signal transmission path between input 809 and output 821 in a second closure control setting.

[0113] As mentioned above... Figure 6 and Figure 7A As described in the differential example, some implementations of a single-ended T-switch can eliminate the need for a shunt switch. Such an example would simply remove shunt switches 830 and 840, thereby disconnecting the connection between the corresponding input and output. Figure 9 The corresponding implementation will exclude the third transistor 930, the fourth transistor 940, and the control input 931. As described above, Figure 9 The implementation of this technology can reduce the size and complexity of switching circuit systems, while also slightly reducing isolation and potential reliability issues that might otherwise need to be addressed in some device designs.

[0114] Figure 9This is a schematic diagram of the implementation of a single-ended T-switch based on some examples described herein. Circuit system 900 is an implementation of switch circuit system 800, wherein a first switch 810 is implemented using a first transistor 910, a second switch 820 is implemented using a second transistor 920, a first shunt switch 830 is implemented using a third transistor 930, and a second shunt switch 840 is implemented using a fourth transistor 940. In circuit system 900, the source of the first transistor 910 is input 909, the gate of the first transistor is control input 913, and the drain of the first transistor 920 is coupled to the source of the second transistor 920. The gate of the second transistor is control input 923, and the drain of the second capacitor 920 is output 921. One end of capacitor 950 is coupled to the drain of the first transistor 910 and the source of the second transistor 920, while the other end of capacitor 950 is coupled to a reference potential 999. The drain of the third transistor 930 is coupled to the gate of the first transistor 910, and the source of the third transistor 930 is coupled to a reference potential 999. Similarly, the drain of the fourth transistor 940 is coupled to the gate of the second transistor 920, and the source of the fourth transistor 940 is coupled to a reference potential 999. The gates of the third transistor 930 and the fourth transistor 940 are coupled together and connected to a control input 931.

[0115] When the switching circuit system 900 is configured by the control circuit system to transmit a signal from input 909 to output 921, the voltages at control inputs 913 and 923 are set to turn on (e.g., enable) the first transistor 910 and the second transistor 920, while the voltage at control input 931 is set to turn off (e.g., disable) the third transistor 930 and the fourth transistor 940. This switching configuration creates a signal path from input 909 to output 921 to transmit the signal along the receiving path.

[0116] When the switching circuit system 900 is configured by the control circuit system to isolate the output 921 from the input 909, the voltages at control inputs 913 and 923 are set to turn off the first transistor 910 and the second transistor 920, while the voltage at control input 931 is set to turn on the third transistor 930 and the fourth transistor 940. This setup impedes signals along the signal path; however, as mentioned above, at high frequencies, the parasitic capacitances of the first transistor 910 and the second transistor 920 can still leak significant signals from the input 909 to the output 921 without additional circuitry. The combination of capacitor 950 and the conduction of the third transistor 930 and the fourth transistor 940 can eliminate the signal leakage through the first transistor 910 and transistor 920 by directing most of the signal to the reference potential 999 and causing some of the leaked signals to cancel each other out. For high frequencies, signal cancellation significantly increases the isolation at the output 921 compared to a circuit without shunt transistors 930 and 940 or capacitor 950. Although the added circuitry may degrade the performance of the closed position, this degradation can be eliminated through circuit design and compensated for by reducing signal leakage to other receiving paths.

[0117] In some respects, the above-described structure can also be used with a single shunt switch, or without a shunt switch, as described above for the differential aspect. One such aspect is a device comprising a first switch similar to switch 810, connected to a second switch similar to switch 820, wherein a capacitor couples the signal path between the two switches to a reference potential. In such an aspect, either the first shunt switch 830, the second shunt switch 840, or both are absent. Another such aspect may be similar to... Figure 9 The switching circuit system 900, but either the third transistor 930 or the fourth transistor 940, or both, are not present in the structure.

[0118] Figure 10 This diagram illustrates two receive paths coupled to a single mixer, which may include a single-ended implementation of a T-switch. The first receive path 1001 includes a receive input 1002 that receives a signal from an antenna (e.g., antenna 130 or any other such antenna). In some examples, the circuitry 1004 is a signal conditioning circuitry (e.g., and may include filters and other circuitry), and the signal from the receive input 1002 is then input to a low-noise amplifier 1006. In some examples, some form of switching may be included before the amplifier. The switching circuitry 800-1 is as described above. Figure 8 The implementation of the T-switch detailed in the text can also be implemented as follows: Figure 9The circuit system 900 (e.g., a single-ended T-switch example). Switching circuit system 800-1 connects the received signal to mixer 1090 or isolates the first receiving path 1001 from mixer 1090, depending on the control input settings of switching circuit system 800-1. Similarly, as shown with respect to mixer 1091, switching circuit system 800-1 can be used in conjunction with switching circuit system 800-3 to direct the received signal to mixer 1090 or mixer 1091. As described above, in receiving circuits such as receiving circuit 400, different combinations of T-switch implementations can be used both as part of improved isolation and as direction of the received signal along a selected branch (e.g., between mixer 1091 and mixer 1090) that is part of the receiving path. The receiving path in the receiving circuit 400 may include multiple instances of a split-type T-switch for routing signals between mixers arranged in different ways, including routing signals from a single path to different mixers and routing signals from multiple paths to a single mixer, while isolating other paths to reduce interference to the selected signal.

[0119] The second receive path 1051 is shown as a mirror image of the first receive path 1001 with a shared mixer 1090. In other examples, in addition to the mixer 1090 shown, the receive path 1051 may optionally be connected to one or more additional separate mixers. As described above, the switching and specific component characteristics may differ from the circuit element characteristics of the circuit elements of the first receive path 401 in order to configure the receive path to process a specific signal of a specific frequency band or RF signal type. As shown, the second receive path 1051 includes a receiver input 1052, a circuit system 1054, and an amplifier 1056, which operates similarly to the corresponding component of the first receive path 1001 described above. The switching circuit system 800-2 then includes a separate implementation of a T-switch to connect or isolate the second receive path 1051 from the mixer 1090, as a complement to the switching circuit system 800-1. Figure 8 and Figure 9 Details of the T-type switch that can be used in switching circuit systems 800-1, 800-3 and 800-2 are shown.

[0120] Figure 11A This is a flowchart illustrating an example of a method 1100 for switching, redirecting, or otherwise routing signals in a wireless communication device or apparatus. Method 1100 is described in the form of a set of blocks specifying operations that can be performed. However, the operations are not necessarily limited to... Figure 11A The order shown or described herein is not fixed, as operations can be implemented in an alternative order or in a fully or partially overlapping manner. Furthermore, more, fewer, and / or different operations can be implemented to perform method 1100 or alternative methods.

[0121] In block 1102, method 1100 includes the operation of receiving a signal at an input of a wireless communication device, the wireless communication device comprising: a first differential switch having a first differential input, a first differential output, and a first control input; a second differential switch having a second differential input, a second differential output, and a second control input connected to the first differential output to form the input; a shunt capacitor coupled between a first input of the first differential output and a second input of the first differential output, wherein the shunt capacitor is also coupled between the first input of the second differential input and the second input of the second differential input; a first shunt switch having a third control input, a third input, and a third output, wherein the third input and the third output are coupled across the first control input; and a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input and the fourth output are coupled across the second control input.

[0122] In block 1104, method 1100 includes the operation of receiving one or more control signals at a first control input, a second control input, a third control input, and a fourth control input.

[0123] In block 1106, method 1100 includes operations for managing the transmission and / or isolation of signals based on one or more control signals. As described above, managing transmission may involve configuring circuit elements of a T-switch such that the switching element closes and the shunt element opens, and managing isolation may involve configuring circuit elements of a T-switch such that the shunt element closes and the switching element opens. In some examples, where multiple switches are used to manage multiple paths, a split T-switch may be configured to isolate a first signal from a second path, while a second split T-switch may be configured to transmit another signal on the second path. In other implementations, any such configuration, setup, and operations for managing signals may be used, either according to or in addition to the operations described in method 1100, including configurations with multiple signal paths, multiple switches, additional elements, or other such configurations.

[0124] Figure 11B This is a flowchart illustrating an example of a method 1150 for switching, redirecting, or otherwise routing signals in a wireless communication device or apparatus. Method 1150 is described in the form of a set of blocks specifying operations that can be performed. However, the operations are not necessarily limited to... Figure 11B The order shown or described herein is not necessarily the same, as operations can be implemented in an alternative order or in a fully or partially overlapping manner. Furthermore, more, fewer, and / or different operations can be implemented to perform method 1150 or alternative methods.

[0125] In block 1152, method 1150 includes controlling a switching circuitry system in a first mode to isolate the inputs of the switching circuitry system from its outputs. This control can be performed using a first control signal from a control circuitry system of a device (such as processor 108 of electronic device 102 or microprocessor 1212 of electronic device 1202, or any other such control circuitry system in electronic device 1202 or 102). The first control signal is configured to select an off configuration for a first switch and an off configuration for a second switch. In some aspects, the first switch has an input, an output, and a control input for the first control signal, and the second switch has an output for the control signal, an input coupled to the output of the first switch, and a control input. The first and second switches can be any in-path switch described herein, such as... Figure 6 Switches 610 and 620 Figure 8 Switches 810 and 820, or Figure 7A and Figure 9 The switch is implemented as a transistor. A first control signal is also configured to select a closed configuration for both the first and second shunt switches. In some aspects, the first shunt switch is configured to shunt a parasitic transmission path signal from the first switch when the first switch is in an open configuration and the second shunt switch is in a closed configuration, and the second shunt switch is configured to shunt a parasitic transmission path signal from the second switch when the second switch is in an open configuration and the second shunt switch is in a closed configuration. The shunt switch can be any shunt switch described herein, such as... Figure 6 First shunt switch 630 and second shunt switch 640 Figure 8 First shunt switch 830 and second shunt switch 840, or Figure 9 and Figure 7A The implementation shown is a shunt switch using a transistor.

[0126] In block 1154, method 1150 includes controlling a switching circuit system in a second mode using a second control signal to connect the input of the switching circuit system to the output of the switching circuit system. The second control signal is configured to: select a closed configuration for a first switch and a closed configuration for a second switch; and select an open configuration for both a first shunt switch and a second shunt switch. For example, such operation can be used in devices implementing receiver switch matrix (RxSM) circuitry, such as... Figure 4A and Figure 4BThe illustrated RxSM circuit. In this illustrated circuit, a switching circuit system (e.g., circuit systems 600-1, 600-2, 600-3, etc.) can operate according to method 1150 to connect a given path to the mixer or isolate a given path from the mixer and the associated output elements of the RxSM. In some such examples, a first mode isolates the input of a first path of the RxSM from the first mixer, and a second mode connects the input to the first mixer via the switching circuit system. In some such examples, the first mode connects the input to the second mixer via a second switching circuit system, and the second mode isolates the input from the second mixer using the second switching circuit system. In other examples, a control circuit system uses the operation of method 1150 described above to select other such configurations within the available paths.

[0127] Other illustrative aspects of this disclosure include:

[0128] Aspect 1. A wireless communication device, comprising: a first differential switch having a first input and a second input, a first output and a second output, and a control input; a second differential switch having a first input and a second input coupled to the respective first output and second output of the first differential switch, the second differential switch further having a first output and a second output, and a control input; a shunt capacitor coupled between the first output and the second output of the first differential switch, the shunt capacitor further coupled between the first input and the second input of the second differential switch; a first shunt switch having a control input, an input, and an output, the input and the output coupled to the control input of the first differential switch; and a second shunt switch having a control input, an input, and an output, the input and the output coupled to the control input of the second differential switch.

[0129] Aspect 2. The wireless communication device according to Aspect 1, wherein the first differential switch includes a first transistor and a second transistor; wherein the first input of the first differential switch includes a first terminal of the first transistor; wherein the second input of the first differential switch includes a first terminal of the second transistor; wherein the first output of the first differential switch includes a second terminal of the first transistor; wherein the second output of the first differential switch includes a second terminal of the second transistor; and wherein the control input of the first differential switch includes the gate of the first transistor and the gate of the second transistor.

[0130] Aspect 3. The wireless communication device according to Aspect 2, wherein the first shunt switch includes a third transistor having a drain coupled to the gate of the first transistor and a source coupled to the gate of the second transistor, and wherein the control input of the first shunt switch includes the gate of the third transistor.

[0131] Aspect 4. The wireless communication device according to Aspect 3, wherein the second differential switch includes a fourth transistor and a fifth transistor; wherein the first input of the second differential switch includes a first terminal of the fourth transistor; wherein the second input of the second differential switch includes a first terminal of the fifth transistor; wherein the first output of the second differential switch includes a second terminal of the fourth transistor; wherein the second output of the second differential switch includes a second terminal of the fifth transistor; and wherein the control input of the second differential switch includes the gate of the fourth transistor and the gate of the fifth transistor.

[0132] Aspect 5. The wireless communication device according to aspect 4, wherein the second shunt switch includes a sixth transistor having a drain coupled to the gate of a fourth transistor and a source coupled to the gate of a fifth transistor, and wherein the control input of the second shunt switch further includes the gate of the sixth transistor.

[0133] Aspect 6. A wireless communication device according to any one of Aspects 1 to 5, wherein the first differential switch, the second differential switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of a receiving circuit.

[0134] Aspect 7. The wireless communication device according to aspect 6 further includes: a first mixer of the receiving circuit coupled to a second differential switch; and a second receiving path of the receiving circuit coupled to the first mixer.

[0135] Aspect 7A. The wireless communication device according to aspect 7, wherein the second receiving path includes a switching circuit system, the switching circuit system including outputs coupled to the first mixer and the second differential switch.

[0136] Aspect 8. The wireless communication device according to aspect 7 further includes a transformer having a transformer differential output coupled to a first input and a second input of a first differential switch.

[0137] Aspect 8A. The wireless communication device according to aspect 8 further includes a switching circuit system comprising a first switch connection and a second switch connection, wherein the second switch connection is coupled to the input of a transformer, and wherein the first switch connection is coupled to a low-noise amplifier.

[0138] Aspect 9. The wireless communication device according to aspect 8 further includes a capacitor bank with differential output coupling across the transformer.

[0139] Aspect 10. The wireless communication device according to aspect 8 further includes a second mixer coupled to the differential output of the transformer via a switching circuit system.

[0140] Aspect 11. A wireless communication device according to any one of Aspects 1 to 7, wherein the first differential switch, the second differential switch, the first shunt switch, the second shunt switch and the shunt capacitor are configured as separate differential T-type switches.

[0141] Aspect 12. The wireless communication apparatus according to aspect 11 further includes multiple receiving paths configured to support multiple communication frequency bands, wherein a split differential T-switch is configured to isolate a first receiving path from a second receiving path among the multiple receiving paths.

[0142] Aspect 13. The wireless communication device according to aspect 7 further includes an antenna coupled to the first receiving path.

[0143] Aspect 14. The wireless communication device according to any one of Aspects 1 to 13 further includes a control circuit system coupled to the control input of the first differential switch, the control input of the second differential switch, the control input of the first shunt switch, and the control input of the second shunt switch.

[0144] Aspect 15. The wireless communication device according to aspect 14, wherein the control circuit system is configured to deselect the control input of the first differential switch and the control input of the second differential switch, while selecting the control input of the first shunt switch and the control input of the second shunt switch, so as to disconnect the first differential switch and the second differential switch and close the first shunt switch and the second shunt switch, so as to isolate the first input and the second input of the first differential switch from the first output and the second output of the second differential switch.

[0145] Aspect 16. The wireless communication device according to aspect 14, wherein the control circuit system is configured to select the control input of the first differential switch and the control input of the second differential switch, while deselecting the control input of the first shunt switch and the control input of the second shunt switch, so as to close the first differential switch and the second differential switch and open the first shunt switch and the second shunt switch.

[0146] Aspect 17. The wireless communication device according to aspect 15 further includes a modem coupled to the control circuit system.

[0147] Aspect 18. A wireless communication device comprising: a first switch having a first input, a first output, and a first control input; a second switch having a second input, a second output, and a second control input connected to the first output; a shunt capacitor coupled between the first output and a reference potential, wherein the shunt capacitor is also coupled between the second input and the reference potential; a first shunt switch having a third control input, a third input, and a third output, wherein the third input is coupled to the first control input, and the third output is coupled to the reference potential; and a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input is coupled to the second control input, and the fourth output is coupled to the reference potential.

[0148] Aspect 19. The wireless communication device according to aspect 18, wherein the first switch is a first single-ended switch, wherein the second switch is a second single-ended switch, and wherein the first switch, the second switch, the shunt capacitor, the first shunt switch and the second shunt switch are part of a first receiving path of a receiving circuit.

[0149] Aspect 20. The wireless communication device according to aspects 18 to 19, wherein the first switch includes a first transistor, a first input is a first terminal of the first transistor, a first output is a second terminal of the first transistor, and a first control input is the gate of the first transistor.

[0150] Aspect 21. A wireless communication device according to any one of aspects 18 to 20, wherein the second switch includes a second transistor, wherein the second input is a first terminal of the second transistor, the second output is a second terminal of the second transistor, and the second control input is the gate of the second transistor.

[0151] Aspect 22. A wireless communication device according to aspect 21, wherein the second shunt switch includes a fourth transistor having a drain coupled to the gate of the second transistor and a source coupled to a reference potential, and wherein the fourth control input further includes the gate of the fourth transistor.

[0152] Aspect 23. A wireless communication device according to any one of Aspects 20 to 22, wherein the first single-ended switch, the second single-ended switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of a receiving circuit.

[0153] Aspect 24. The wireless communication apparatus according to aspect 23 further includes: a first mixer of a receiving circuit coupled to a second output of a second single-ended switch; a second receiving path of the receiving circuit; wherein the second output of the second single-ended switch is coupled to the output of the second receiving path; and wherein the first receiving path further includes a low-noise amplifier (LNA) having an output coupled to a first input.

[0154] Aspect 25. The wireless communication device according to aspect 24, wherein the first single-ended switch, the second single-ended switch, the first shunt switch, the second shunt switch and the shunt capacitor are configured as separate T-type switches.

[0155] Aspect 26. The wireless communication apparatus according to any one of aspects 18 to 25 further includes multiple receiving paths reconfigurable to support multiple communication frequency bands for multiple communication standards, wherein a first receiving path can be isolated from a second receiving path among the multiple receiving paths using a split T-switch.

[0156] Aspect 27. The wireless communication device according to aspect 24 further includes an antenna coupled to the LNA.

[0157] Aspect 28. The wireless communication device according to any one of aspects 18 to 27 further includes a control circuit system coupled to the first control input, the second control input, the third control input, and the fourth control input.

[0158] Aspect 29. The wireless communication device according to aspect 28, wherein the control circuit system is configured to deselect the first control input and the second control input, while selecting the third control input and the fourth control input, to disconnect the first switch and disconnect the second input from the second output.

[0159] Aspect 30. The wireless communication device according to aspect 28, wherein the control circuit system is configured to select a first control input and a second control input while deselecting a third control input and a fourth control input to close the first switch and the second switch while opening the first shunt switch and the second shunt switch to couple the first input to the second output.

[0160] Aspect 31. The wireless communication device according to any one of aspects 28 to 30 further includes a modem coupled to the control circuitry system.

[0161] Aspect 32. A wireless communication device comprising: a switching circuit system including: a first switch having a first input, a first output, and a first control input; a second switch having a second input, a second output, and a second control input electrically coupled to the first output of the first switch; a third switch having a third input, a third output, and a third control input; a fourth switch having a fourth input, a fourth output, and a fourth control input electrically coupled to the third output of the third switch; a capacitor electrically grounded having a first terminal electrically coupled to a first node between the first switch and the second switch and a second terminal electrically coupled to a second node between the third switch and the fourth switch; a fifth switch electrically coupled between the first control input and the third control input; and a sixth switch electrically coupled between the second control input and the fourth control input.

[0162] Aspect 33. The wireless communication device according to aspect 32, wherein a switching circuit system is coupled between a low-noise amplifier (LNA) and a mixer.

[0163] Aspect 34. A wireless communication device according to aspect 33, wherein the LNA has a differential output, and a first input of a first switch and a third input of a third switch are configured to receive a differential signal output by the LNA.

[0164] Aspect 35. A wireless communication apparatus according to aspect 33, wherein the LNA is a first LNA, and wherein a mixer is coupled to a receiving circuit having a second LNA.

[0165] Aspect 36. The wireless communication apparatus according to aspect 33, wherein the LNA is also connected to a receiving path having another mixer that is different from the mixer.

[0166] Aspect 37. A wireless communication device according to any one of Aspects 32 to 36, wherein the first switch is a first transistor, the second switch is a second transistor, the third switch is a third transistor, the fourth switch is a fourth transistor, the fifth switch is a fifth transistor, and the sixth switch is a sixth transistor.

[0167] Aspect 38. A wireless communication device comprising: a switching circuit system including: a first transistor having a first source, a first drain, and a first gate input; a second transistor having a second source electrically coupled to the first drain of the first transistor, wherein the second transistor has a second drain and a second gate; a third transistor having a third source, a third drain, and a third gate; a fourth transistor having a fourth source electrically coupled to the third drain of the third transistor, wherein the fourth transistor has a fourth drain and a fourth gate; a capacitor electrically grounded having a first terminal electrically coupled to a first node between the first drain and the second source, and the capacitor further having a second terminal electrically coupled to a second node between the third drain and the fourth source; a fifth transistor having a fifth source coupled to the third gate, a fifth drain coupled to the first gate, and a fifth gate; and a sixth transistor having a sixth source coupled to the fourth gate, a sixth drain coupled to the second gate, and a sixth gate.

[0168] Aspect 39. The wireless communication device according to aspect 38, wherein the first gate, the second gate, the third gate, the fourth gate, the fifth gate and the sixth gate are electrically coupled to a control circuit system, the control circuit system selecting a switching state for a switching circuit system.

[0169] Aspect 40. The wireless communication device according to aspects 38 to 39, wherein a switching circuit system is coupled between the LNA and the mixer.

[0170] Aspect 41. A wireless communication device according to aspect 40, wherein the switching circuit system wherein the LNA has a differential output, and the first input of the first switch and the third input of the third switch are configured to receive the differential signal output by the LNA.

[0171] Aspect 42. A wireless communication device according to aspect 40, wherein the LNA is a first LNA, and wherein the mixer is coupled to a receiving circuit having a second LNA.

[0172] Aspect 43. The wireless communication device according to aspect 40, wherein the LNA is also connected to a receiving path having another mixer that is different from the mixer.

[0173] Aspect 44. A method for switching signals in a wireless communication device, the method comprising: receiving signals at an input of the wireless communication device, the wireless communication device comprising: a first differential switch having a first differential input, a first differential output, and a first control input; a second differential switch having a second differential input, a second differential output, and a second control input connected to the first differential output to form the input; a shunt capacitor coupled between a first terminal and a second terminal of the first differential output, wherein the shunt capacitor is also coupled between a first terminal and a second terminal of the second differential input; a first shunt switch having a third control input, a third input, and a third output, wherein the third input and the third output are coupled across the first control input; and a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input and the fourth output are coupled across the second control input; receiving one or more control signals at the first control input, the second control input, the third control input, and the fourth control input; and managing the transmission of the signals based on the one or more control signals.

[0174] Aspect 45. A method of operating a wireless communication device using a control circuit system according to any aspect thereof.

[0175] Aspect 46. A computer-readable storage medium including instructions that, when executed by a control circuitry system of a device, cause the device to control a T-switch in a receiver circuit according to any aspect described herein.

[0176] Aspect 47. An apparatus comprising components for performing operations according to any aspect described herein.

[0177] Aspect 48. An apparatus comprising: a component for controlling a switching circuit system of a circuit in a first mode using a first control signal to isolate the input of the switching circuit system from the output of the switching circuit system; the first control signal being configured to: select an open configuration for a first component of the switch and a second component of the switch; and select a closed configuration for a third component and a fourth component of the switch, the first component of the switch being configured to shunt parasitic transmission path signals from the first component of the switch in the open configuration, and the fourth component of the switch being configured to shunt parasitic transmission path signals from the second component of the switch in the open configuration; and a component for controlling the switching circuit system of the circuit in a second mode using a second control signal to connect the input of the switching circuit system to the output of the switching circuit system.

[0178] Aspect 49. A method comprising: controlling a switching circuit system of a circuit in a first mode using a first control signal to isolate the input of the switching circuit system from the output of the switching circuit system, the first control signal being configured to: select an open configuration for a first switch and a select open configuration for a second switch, the first switch having an input, an output, and a control input for the first control signal, and the second switch having an output for the first control signal, an input coupled to the output of the first switch, and a control input; and selecting a closed configuration for a first shunt switch and a second shunt switch, the first shunt switch being configured to shunt a parasitic transmission path signal from the first switch when the first switch is in an open configuration and the first shunt switch is in a closed configuration, and the second shunt switch being configured to shunt a parasitic transmission path signal from the second switch when the second switch is in an open configuration and the second shunt switch is in a closed configuration; and controlling the switching circuit system of the circuit in a second mode using a second control signal to connect the input of the switching circuit system to the output of the switching circuit system, the second control signal being configured to: select a closed configuration for the first switch and a select closed configuration for the second switch; and select an open configuration for the first shunt switch and the second shunt switch.

[0179] Aspect 50. The method of claim 33, wherein the circuit is a receiver switch matrix (RxSM) circuit.

[0180] Aspect 51. The method of claim 34, wherein the first mode isolates the input of the first path of the RxSM from the first mixer; and wherein the second mode connects the input to the first mixer via a switching circuit system.

[0181] Aspect 52. The method of claim 35, wherein the first mode connects the input to the second mixer via a second switching circuit system; and wherein the second mode isolates the input from the second mixer using the second switching circuit system.

[0182] Aspect 53. A wireless communication device comprising: a first differential switch having a first input and a second input, a first output and a second output, and a control input; a second differential switch having a first input and a second input coupled to the respective first output and second output of the first differential switch, the second differential switch further having a first output and a second output, and a control input; and a shunt capacitor coupled between the first output and the second output of the first differential switch, the shunt capacitor also being coupled between the first input and the second input of the second differential switch.

[0183] Aspect 54. A wireless communication device according to aspect 53, wherein the first differential switch includes a first transistor and a second transistor; wherein a first input of the first differential switch includes a first terminal of the first transistor; wherein a second input of the first differential switch includes a first terminal of the second transistor; wherein a first output of the first differential switch includes a second terminal of the first transistor; wherein a second output of the first differential switch includes a second terminal of the second transistor; and wherein a control input of the first differential switch includes the gate of the first transistor and the gate of the second transistor.

[0184] Aspect 55. A wireless communication device according to aspects 53 to 54, wherein the second differential switch includes a fourth transistor and a fifth transistor; wherein a first input of the second differential switch includes a first terminal of the fourth transistor; wherein a second input of the second differential switch includes a first terminal of the fifth transistor; wherein a first output of the second differential switch includes a second terminal of the fourth transistor; wherein a second output of the second differential switch includes a second terminal of the fifth transistor; and wherein a control input of the second differential switch includes the gate of the fourth transistor and the gate of the fifth transistor.

[0185] Aspect 56. A wireless communication device according to any one of aspects 53 to 55, wherein the first differential switch, the second differential switch, and the shunt capacitor are part of a first receiving path of a receiving circuit.

[0186] Aspect 57. The wireless communication apparatus according to aspect 56 further includes: a first mixer of the receiving circuit coupled to a second differential switch; and a second receiving path of the receiving circuit coupled to the first mixer.

[0187] Aspect 58. The wireless communication device according to aspect 57 further includes a transformer having a transformer differential output coupled to a first input and a second input of a first differential switch.

[0188] Aspect 59. The wireless communication device according to aspect 58 further includes a capacitor bank that is differentially coupled across the transformer output.

[0189] Aspect 60. The wireless communication device according to aspect 58 further includes a second mixer coupled to the differential output of the transformer via a switching circuit system.

[0190] Aspect 61. A wireless communication device according to any one of aspects 53 to 60, wherein the first differential switch, the second differential switch and the shunt capacitor are configured as a separate differential T-type switch.

[0191] Aspect 62. The wireless communication device according to aspect 61 further includes multiple receiving paths configured to support multiple communication frequency bands, wherein a split differential T-switch is configured to isolate a first receiving path from a second receiving path among the multiple receiving paths.

[0192] Aspect 63. The wireless communication apparatus according to any one of aspects 60 to 62 further includes an antenna coupled to the first receiving path.

[0193] Aspect 64. The wireless communication device according to any one of aspects 53 to 63 further includes a control circuit system coupled to the control input of the first differential switch and the control input of the second differential switch.

[0194] Aspect 65. A wireless communication device according to aspect 64, wherein the control circuit system is configured to deselect the control input of the first differential switch and the control input of the second differential switch to disconnect the first differential switch and the second differential switch to isolate the first differential input from the second differential output.

[0195] Aspect 66. The wireless communication device according to aspect 64, wherein the control circuit system is configured to select the control input of the first differential switch and the control input of the second differential switch to close the first differential switch and the second differential switch.

[0196] Aspect 67. The wireless communication apparatus according to any one of aspects 64 to 66 further includes a modem coupled to the control circuitry system.

[0197] Aspect 68. A wireless communication device comprising: a first switch having a first input, a first output, and a first control input; a second switch having a second input, a second output, and a second control input connected to the first output; and a shunt capacitor coupled between the first output and a reference potential, wherein the shunt capacitor is also coupled between the second input and the reference potential.

[0198] Aspect 69. A wireless communication device according to aspect 68, wherein the first switch is a first single-ended switch, wherein the second switch is a second single-ended switch, and wherein the first switch, the second switch, and the shunt capacitor are part of a first receiving path of a receiving circuit.

[0199] Aspect 70. The wireless communication device according to aspects 68 to 69, wherein the first switch includes a first transistor, a first input is a first terminal of the first transistor, a first output is a second terminal of the first transistor, and a first control input is the gate of the first transistor.

[0200] Aspect 71. A wireless communication device according to any one of aspects 68 to 70, wherein the second switch includes a second transistor, wherein the second input is a first terminal of the second transistor, the second output is a second terminal of the second transistor, and the second control input is the gate of the second transistor.

[0201] Aspect 72. A wireless communication device according to any one of aspects 68 to 71, wherein the first single-ended switch, the second single-ended switch, and the shunt capacitor are part of a first receiving path of a receiving circuit.

[0202] Aspect 73. The wireless communication apparatus according to aspect 72 further includes: a first mixer of a receiving circuit coupled to a second output of a second single-ended switch; a second receiving path of the receiving circuit; wherein the second output of the second single-ended switch is coupled to the output of the second receiving path; and wherein the first receiving path further includes a low-noise amplifier (LNA) having an output coupled to a first input.

[0203] Aspect 74. The wireless communication device according to aspect 73, wherein the first single-ended switch, the second single-ended switch and the shunt capacitor are configured as a separate T-type switch.

[0204] Aspect 75. A wireless communication apparatus according to any one of aspects 68 to 74 further includes multiple receiving paths reconfigurable to support multiple communication frequency bands for multiple communication standards, wherein a first receiving path can be isolated from a second receiving path among the multiple receiving paths using a split T-switch.

[0205] Aspect 76. The wireless communication device according to aspect 75 further includes an antenna coupled to the first receiving path.

[0206] Aspect 77. The wireless communication device according to any one of aspects 68 to 76 further includes a control circuit system coupled to the first control input, the second control input, the third control input, and the fourth control input.

[0207] Aspect 78. A wireless communication device according to aspect 77, wherein the control circuit system is configured to deselect a first control input and a second control input, while selecting a third control input and a fourth control input, to disconnect a first switch and disconnect a second input from a second output.

[0208] Aspect 79. A wireless communication device according to aspect 78, wherein the control circuit system is configured to select a first control input and a second control input while deselecting a third control input and a fourth control input to close the first switch and the second switch to couple the first input to the second output.

[0209] Aspect 80. The wireless communication apparatus according to aspects 78 to 79 further includes a modem coupled to the control circuitry system.

[0210] Figure 12 An example electronic device 1202 is illustrated, which includes a transceiver 1206 that can implement a T-switch according to the example described herein. For example, IC 1210 can act as a control circuitry system for sending control signals to the inputs of one or more T-switches implemented in transceiver 1206 according to any of switch circuitry systems 600, 700, 800, or 900. As shown, in addition to integrated circuit 1210, electronic device 1202 also includes an antenna 1204, transceiver 1206, and user input / output (I / O) interface 1208. Illustrated examples of integrated circuit 1210 or its core include a microprocessor 1212, a graphics processing unit (GPU) 1214, a memory array 1216, and a modem 1218. Each component is operatively coupled to another component, such as GPU 1214, which is operatively coupled to user I / O interface 1208.

[0211] Electronic device 1202 can be a mobile or battery-powered device or a stationary device designed to be powered by the power grid. Examples of electronic device 1202 include server computers, network switches or routers, data center blades, personal computers, desktop computers, laptops or notebook computers, tablet computers, smartphones, entertainment devices, or wearable electronic devices such as smartwatches, smart glasses, or clothing. Electronic device 1202 can also be a device or part thereof with embedded electronics. Examples of electronic device 1202 with embedded electronics include passenger vehicles, industrial equipment, refrigerators or other household appliances, drones or other unmanned aerial vehicles (UAVs), or power tools.

[0212] For a wirelessly capable electronic device, electronic device 1202 includes an antenna 1204 coupled to transceiver 1206 to enable the reception or transmission of one or more wireless signals. Integrated circuit 1210 may be coupled to transceiver 1206 to enable integrated circuit 1210 to access received wireless signals or provide wireless signals for transmission via antenna 1204. The illustrated electronic device 1202 also includes at least one user I / O interface 1208. Examples of user I / O interfaces 1208 include a keyboard, mouse, microphone, touchscreen, camera, accelerometer, haptic mechanism, speaker, display screen, or projector. Transceiver 1206 may correspond to, for example, wireless transceiver 122 (e.g., Figure 1 and Figure 2 (of), and may include a receiving path or receiving circuit with a T-type switch according to the example described herein (e.g., receiving circuit 400).

[0213] Integrated circuit 1210 may include one or more instances of, for example, microprocessor 1212, GPU 1214, memory array 1216, modem 1218, etc. Microprocessor 1212 may be used as a central processing unit (CPU) or other general-purpose processor. Some microprocessors include different parts, such as multiple processing cores, which can be individually powered on or off. GPU 1214 may be particularly well-suited for processing visually relevant data for display, such as video data images. If the visually relevant data is not rendered or otherwise processed, GPU 1214 may be completely or partially powered off. Memory array 1216 stores data from microprocessor 1212 or GPU 1214. Examples of memory types for memory array 1216 include random access memory (RAM), such as dynamic RAM (DRAM) or static RAM (SRAM); flash memory; etc. If a program does not access the data stored in the memory, memory array 1216 may be powered off entirely or block by block. Modem 1218 demodulates signals to extract encoded information or modulates signals to encode information into signals. If there is no information to decode from inbound communications or to encode for outbound communications, modem 1218 can remain idle to reduce power consumption. Integrated circuit 1210 may include additional or alternative components to the shown components, such as I / O interfaces, sensors (such as accelerometers), another part of a transceiver or receiver chain, custom or hard-coded processors (such as application-specific integrated circuits (ASICs)), etc.

[0214] Integrated circuit 1210 may also include a system-on-a-chip (SoC). A SoC can integrate a sufficient number of components of different types to enable the SoC to primarily use a single chip to provide computing functions as a laptop, mobile phone, or other electronic device. The components of the SoC or integrated circuit 1210 are typically referred to as cores or circuit blocks. In addition... Figure 12 In addition to those shown, examples of cores or circuit blocks include voltage regulators, main memory or cache memory blocks, memory controllers, general-purpose processors, cryptographic processors, video or image processors, vector processors, radios, interface or communication subsystems, wireless controllers, or display controllers. Any of these cores or circuit blocks (such as a central processing unit or multimedia processor) may also include multiple internal cores or circuit blocks.

[0215] Specific details are provided in the foregoing description to provide a thorough understanding of the embodiments and examples provided herein. However, those skilled in the art will understand that these embodiments can be practiced without these specific details. For clarity, in some instances, the technology may be presented as comprising individual functional blocks, including devices, device components, steps, or routines in a method embodied in software or a combination of hardware and software. Components other than those shown in the figures and / or described herein may be used. For example, circuits, systems, networks, processes, and other components may be shown as components in block diagram form to avoid obscuring the embodiments with unnecessarily detailed information. In other instances, well-known circuits, processes, algorithms, structures, and techniques may be shown without unnecessarily detailed information to avoid obscuring the embodiments.

[0216] The above can be described as individual embodiments of a process or method as shown in a flowchart, diagrammatic flowchart, data flow diagram, structural diagram, or block diagram. While a flowchart can describe operations as a continuous process, many operations can be performed in parallel or simultaneously. Furthermore, the order of operations can be rearranged. A process terminates when its operations are completed, but there may be other steps not included in the diagram. A process can correspond to a method, function, procedure, subroutine, etc. When a process corresponds to a function, its termination can correspond to the function returning to the calling function or the main function.

[0217] The processes and methods described in the examples above can be implemented using computer-executable instructions stored in or otherwise accessible from a computer-readable medium. Such instructions may include, for example, instructions and data that cause or otherwise configure a general-purpose computer, special-purpose computer, or processing device to perform a specific function or group of functions. Parts of the computer resources used may be accessible via a network. The computer-executable instructions may be, for example, binary files, intermediate format instructions such as assembly language, firmware, or source code. Examples of computer-readable media that may be used to store instructions, information used, and / or information created during the methods according to the examples include hard disks or optical disks, flash memory, USB devices provided with non-volatile memory, network storage devices, etc.

[0218] Devices implementing the processes and methods disclosed herein may include hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof, and may take any of a variety of form factors. When implemented as software, firmware, middleware, or microcode, program code or code segments (e.g., computer program products) for performing the necessary tasks may be stored on a computer-readable or machine-readable medium. Multiple processors may perform the necessary tasks. Typical examples of form factors include laptops, smartphones, mobile phones, tablet devices or other small personal computers, personal digital assistants, rack-mounted devices, standalone devices, etc. The functionality described herein may also be embodied in peripheral devices or add-in cards. For example, such functionality may also be implemented on a circuit board between different chips or different processes executed in a single device.

[0219] Instructions, media for transmitting such instructions, computing resources for executing such instructions, and other structures for supporting such computing resources are example means for providing the functionality described in this disclosure.

[0220] In the foregoing description, various aspects of this application have been described with reference to specific embodiments thereof; however, those skilled in the art will recognize that this application is not limited thereto. Therefore, while illustrative embodiments of this application have been described in detail herein, it should be understood that the concepts of the invention may be embodied and used differently in other ways, and the appended claims are intended to be construed as including such variations, unless limited by prior art. Various features and aspects of the above applications may be used individually or in combination. Furthermore, embodiments may be used in any number of environments beyond those described herein without departing from the broader spirit and scope of this specification. Therefore, the specification and drawings should be considered illustrative rather than restrictive. For illustrative purposes, the methods are described in a particular order. It should be understood that in alternative embodiments, the methods may be performed in a different order than described.

[0221] Those skilled in the art will understand that the less than (“<”) and greater than (“>”) symbols or terms used herein may be replaced with less than or equal to (“≤”) and greater than or equal to (“≥”) without departing from the scope of this specification.

[0222] When a component is described as being “configured” to perform certain operations, such configuration can be achieved, for example, by designing electronic circuits or other hardware to perform the operations, programming programmable electronic circuits (e.g., microprocessors or other suitable electronic circuits) to perform the operations, or any combination thereof.

[0223] The phrase “coupled to” means any component that is physically connected directly or indirectly to another component, and / or any component that communicates directly or indirectly with another component (e.g., connected to another component via a wired or wireless connection and / or other suitable communication interface).

[0224] The language of claims stating "at least one of the set" and / or "one or more of the set," or other languages, indicates that one or more members of the set (in any combination) satisfy the claim. For example, the language of claims stating "at least one of A and B" or "at least one of A or B" indicates A, B, or A and B. In another example, the language of claims stating "at least one of A, B, and C" or "at least one of A, B, or C" indicates A, B, C, or A and B, or A and C, or B and C, or A and B and C. The language "at least one of the set" and / or "one or more of the set" does not limit the set to items listed in the set. For example, the language of claims stating "at least one of A and B" or "at least one of A or B" can indicate A, B, or A and B, and may also include items not listed in the set A and B.

[0225] Unless the context otherwise requires, the use of the word “or” herein can be interpreted as the use of an inclusive “or”, or a term that allows the inclusion or application of one or more items related to “or” (e.g., the phrase “A or B” can be interpreted as allowing only “A”, only “B”, or both “A” and “B”). Furthermore, items represented in the figures and terminology discussed herein may represent one or more items or terms, and therefore may be used interchangeably to refer to single or multiple forms of items and terms in this written description. Finally, while the subject matter has been described in language specific to structural features or methodological operations, it should be understood that the subject matter as defined in the appended claims is not necessarily limited to the specific features or operations described above, including not necessarily limited to the organization of arrangement features or the order of performing operations.

[0226] As used herein, the term "determine" encompasses a variety of actions. For example, "determine" can include calculating, processing, deriving, investigating, searching (e.g., looking in a table, database, or other data structure), confirming, etc. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), etc. Additionally, "determine" can include resolving, selecting, picking, establishing, etc.

[0227] The various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the examples disclosed herein can be implemented as electronic hardware, computer software, firmware, or a combination thereof. To clearly illustrate this interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps have been described above in general terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the system as a whole. Skilled artisans can implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as deviating from the scope of this application.

[0228] The techniques described herein can also be implemented as electronic hardware, computer software, firmware, or any combination thereof. Such techniques can be implemented in any device across a variety of devices, such as general-purpose computers, wireless communication handsets, or multi-purpose integrated circuit devices, including applications in wireless communication handsets and other devices. Any feature described as a module or component can be implemented together in an integrated logic device or separately as a discrete but interoperable logic device. If implemented in software, the technology can be implemented at least in part by a computer-readable data storage medium comprising program code including instructions that, when executed, perform one or more of the methods, algorithms, and / or operations described above. The computer-readable data storage medium can form part of a computer program product, which may include packaging materials. The computer-readable medium can include memory or data storage media, such as random access memory (RAM) (such as synchronous dynamic random access memory (SDRAM)), read-only memory (ROM), non-volatile random access memory (NVRAM), electrically erasable programmable read-only memory (EEPROM), flash memory, magnetic or optical data storage media, etc. Alternatively or concurrently, the technology may be implemented at least in part by a computer-readable communication medium that carries or transmits program code in the form of instructions or data structures and can be accessed, read and / or executed by a computer, such as for propagating signals or waves.

[0229] The program code can be executed by a processor, which may include one or more processors, such as one or more digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field-programmable arrays (FPGAs), or other equivalent integrated or discrete logic circuit systems. Such a processor can be configured to perform any of the techniques described in this disclosure. A general-purpose processor may be a microprocessor; however, alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration. Therefore, the term "processor" as used herein can refer to any of the foregoing structures, any combination of the foregoing structures, or any other structure or means suitable for implementing the techniques described herein.

Claims

1. A wireless communication device, comprising: The first differential switch has a first input and a second input, a first output and a second output, and a control input; The second differential switch has a first input and a second input coupled to the corresponding first output and second output of the first differential switch, and the second differential switch also has a first output, a second output, and a control input; A shunt capacitor is coupled between the first output and the second output of the first differential switch, and the shunt capacitor is also coupled between the first input and the second input of the second differential switch; A first shunt switch has a control input, an input, and an output, the input and the output being coupled to the control input of the first differential switch; as well as The second shunt switch has a control input, an input, and an output, the input and the output being coupled to the control input of the second differential switch; The first differential switch, the second differential switch, the first shunt switch, the second shunt switch, and the shunt capacitor are configured as a split-type differential T-switch.

2. The wireless communication device according to claim 1, wherein the first differential switch comprises a first transistor and a second transistor; The first input of the first differential switch includes the first terminal of the first transistor; The second input of the first differential switch includes the first terminal of the second transistor; The first output of the first differential switch includes the second terminal of the first transistor; The second output of the first differential switch includes the second terminal of the second transistor; and The control input of the first differential switch includes the gate of the first transistor and the gate of the second transistor.

3. The wireless communication device of claim 2, wherein the first shunt switch includes a third transistor having a drain coupled to the gate of the first transistor and a source coupled to the gate of the second transistor, and wherein the control input of the first shunt switch includes the gate of the third transistor.

4. The wireless communication device according to claim 3, wherein the second differential switch comprises a fourth transistor and a fifth transistor; The first input of the second differential switch includes the first terminal of the fourth transistor; The second input of the second differential switch includes the first terminal of the fifth transistor; The first output of the second differential switch includes the second terminal of the fourth transistor; The second output of the second differential switch includes the second terminal of the fifth transistor; and The control input of the second differential switch includes the gate of the fourth transistor and the gate of the fifth transistor.

5. The wireless communication device of claim 4, wherein the second shunt switch includes a sixth transistor having a drain coupled to the gate of the fourth transistor and a source coupled to the gate of the fifth transistor, and wherein the control input of the second shunt switch further includes the gate of the sixth transistor.

6. The wireless communication device according to claim 1, wherein the first differential switch, the second differential switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of the receiving circuit.

7. The wireless communication device according to claim 6, further comprising: The first mixer of the receiving circuit is coupled to the second differential switch; as well as The receiving circuit has a second receiving path, which is coupled to the first mixer.

8. The wireless communication device of claim 7, wherein the second receiving path includes a switching circuit system, the switching circuit system including an output coupled to the first mixer and the second differential switch.

9. The wireless communication device of claim 7 further includes a transformer having a transformer differential output coupled to the first input and the second input of the first differential switch.

10. The wireless communication device of claim 9 further includes a switching circuit system comprising a first switch connection and a second switch connection, wherein the second switch connection is coupled to the input of the transformer, and wherein the first switch connection is coupled to a low-noise amplifier.

11. The wireless communication device of claim 9, further comprising a capacitor bank differentially coupled across the transformer output.

12. The wireless communication device of claim 9, further comprising a second mixer coupled to the differential output of the transformer via a switching circuit system.

13. The wireless communication device of claim 1, further comprising a plurality of receiving paths configured to support a plurality of communication frequency bands, wherein the split differential T-switch is configured to isolate a first receiving path from a second receiving path among the plurality of receiving paths.

14. The wireless communication device of claim 7, further comprising an antenna coupled to the first receiving path.

15. The wireless communication device according to claim 1, further comprising a control circuit system coupled to the control input of the first differential switch, the control input of the second differential switch, the control input of the first shunt switch, and the control input of the second shunt switch.

16. The wireless communication device of claim 15, wherein the control circuit system is configured to deselect the control input of the first differential switch and the control input of the second differential switch, while selecting the control input of the first shunt switch and the control input of the second shunt switch, to disconnect the first differential switch and the second differential switch and close the first shunt switch and the second shunt switch, thereby isolating the first input and the second input of the first differential switch from the first output and the second output of the second differential switch.

17. The wireless communication device of claim 15, wherein the control circuit system is configured to select the control input of the first differential switch and the control input of the second differential switch, while deselecting the control input of the first shunt switch and the control input of the second shunt switch, to close the first differential switch and the second differential switch and open the first shunt switch and the second shunt switch.

18. A wireless communication device, comprising: The first switch has a first input, a first output, and a first control input; The second switch has a second input, a second output, and a second control input connected to the first output; A shunt capacitor is coupled between the first output and a reference potential, wherein the shunt capacitor is also coupled between the second input and the reference potential; A first shunt switch has a third control input, a third input, and a third output, wherein the third input is coupled to the first control input, and the third output is coupled to the reference potential; as well as The second shunt switch has a fourth control input, a fourth input, and a fourth output, wherein the fourth input is coupled to the second control input, and the fourth output is coupled to the reference potential; The first switch, the second switch, the first shunt switch, the second shunt switch, and the shunt capacitor are configured as a split-type T-switch.

19. The wireless communication device of claim 18, wherein the first switch is a first single-ended switch, wherein the second switch is a second single-ended switch, and wherein the first switch, the second switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of a receiving circuit.

20. The wireless communication device of claim 19, wherein the first switch comprises a first transistor, the first input is a first terminal of the first transistor, the first output is a second terminal of the first transistor, and the first control input is the gate of the first transistor; The second switch includes a second transistor, wherein the second input is a first terminal of the second transistor, the second output is a second terminal of the second transistor, and the second control input is the gate of the second transistor.

21. The wireless communication device of claim 20, wherein the first shunt switch includes a third transistor, the third input is a second terminal of the third transistor, the third output is a first terminal of the second transistor, and the third control input is the gate of the third transistor; The second shunt switch is a fourth transistor, the fourth input is the second terminal of the fourth transistor, the fourth output is the first terminal of the fourth transistor, and the fourth control input is the gate of the fourth transistor.

22. The wireless communication device of claim 18, wherein the first switch, the second switch, the shunt capacitor, the first shunt switch, and the second shunt switch are part of a first receiving path of a receiving circuit, and the wireless communication device further comprises: The first mixer of the receiving circuit is coupled to the second output of the second switch; as well as The second receiving path of the receiving circuit, wherein the second receiving path includes the first mixer; and The first receiving path further includes a low-noise amplifier (LNA) having an output coupled to the first input of the first switch.

23. The wireless communication device of claim 22, further comprising an antenna coupled to the LNA.

24. The wireless communication device of claim 19 further includes a control circuit system coupled to the first control input, the second control input, the third control input, and the fourth control input.

25. The wireless communication device of claim 24, wherein the control circuit system is configured to select the first control input and the second control input while deselecting the third control input and the fourth control input to close the first single-ended switch and the second single-ended switch and open the first shunt switch and the second shunt switch to couple the first input to the second output.

26. The wireless communication device of claim 25 further includes a modem coupled to the control circuit system.

27. A wireless communication device, comprising: A switching circuit system for a split-type T-switch includes: The first switch has a first input, a first output, and a first control input; The second switch has a second input, a second output, and a second control input electrically coupled to the first output of the first switch; The third switch has a third input, a third output, and a third control input; A fourth switch having a fourth input, a fourth output, and a fourth control input electrically coupled to the third output of the third switch; A capacitor having a first terminal electrically coupled to the first output and a second terminal electrically coupled to the third output; A fifth switch, electrically coupled between the first control input and the third control input; and The sixth switch is electrically coupled between the second control input and the fourth control input.

28. The wireless communication device of claim 27, wherein the switching circuit system is coupled between the low-noise amplifier (LNA) and the mixer.

29. The wireless communication device of claim 28, wherein the LNA is further connected to a receive path having another mixer different from the mixer.

30. The wireless communication device of claim 28, wherein the first switch is a first transistor, the second switch is a second transistor, the third switch is a third transistor, the fourth switch is a fourth transistor, the fifth switch is a fifth transistor, and the sixth switch is a sixth transistor.

31. A wireless communication device, comprising: A switching circuit system for a split-type T-switch includes: The first transistor has a first source, a first drain, and a first gate; The second transistor has a second source electrically coupled to the first drain of the first transistor, wherein the second transistor has a second drain and a second gate. The third transistor has a third source, a third drain, and a third gate; A fourth transistor having a fourth source electrically coupled to the third drain of the third transistor, wherein the fourth transistor has a fourth drain and a fourth gate; A capacitor having a first terminal electrically coupled to the first drain, and the capacitor also having a second terminal electrically coupled to the third drain; The fifth transistor has a fifth source coupled to the third gate, a fifth drain coupled to the first gate, and a fifth gate; and The sixth transistor has a sixth source coupled to the fourth gate, a sixth drain coupled to the second gate, and a sixth gate.

32. The wireless communication device of claim 31, wherein the first gate, the second gate, the third gate, the fourth gate, the fifth gate and the sixth gate are electrically coupled to a control circuit system, the control circuit system selecting a switching state for the switching circuit system.

33. A method for routing signals, comprising: A switching circuit system for a split-type T-switch is controlled in a first mode using a first control signal to isolate the input of the switching circuit system from the output of the switching circuit system. The first control signal is configured as follows: With respect to a first switch select-off configuration and a second switch select-off configuration, the first switch has an input, an output, and a control input for the first control signal, and the second switch has an output for the first control signal, an input coupled to the output of the first switch, and a control input; as well as With regard to the first shunt switch and the second shunt switch, the first shunt switch is configured to shunt the parasitic transmission path signal from the first switch when the first switch is in the open configuration and the first shunt switch is in the closed configuration, and the second shunt switch is configured to shunt the parasitic transmission path signal from the second switch when the second switch is in the open configuration and the second shunt switch is in the closed configuration. as well as The switching circuit system of the circuit is controlled in a second mode using a second control signal to connect the input of the switching circuit system to the output of the switching circuit system, wherein the second control signal is configured to: For the first switch, a closed configuration is selected; and for the second switch, a closed configuration is selected; and Select the disconnect configuration for both the first shunt switch and the second shunt switch.

34. The method of claim 33, wherein the circuit is a receiver switch matrix (RxSM) circuit.

35. The method of claim 34, wherein the first mode isolates the input of the first path of the RxSM from the first mixer; and The second mode connects the input of the first path to the first mixer via the switching circuit system.

36. The method according to claim 35, wherein, The circuit further includes a second switching circuit system, and the first mode connects the input of the first path to the second mixer via the second switching circuit system; and The second mode uses the second switching circuit system to isolate the input of the first path from the second mixer.

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