Transmitter (TX) hopping with switching devices
By using switch devices to selectively couple transmit chains and power supplies, the apparatus enables efficient Tx hopping across multiple frequency bands, addressing path loss and hardware cost challenges in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2023/118970
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-15
- Publication Date
- 2025-03-20
AI Technical Summary
Existing wireless communication systems face challenges in efficiently implementing transmitter (Tx) hopping across multiple frequency bands due to limitations in switch devices and power supply management, leading to increased path loss and hardware costs.
The implementation of an apparatus with switch devices that selectively couple transmit chains and power supplies to a signal amplifier, allowing for Tx hopping across multiple bands while minimizing hardware costs by using single-pole, double-throw (SPDT) switches and shared power supplies.
This solution enables efficient Tx hopping across multiple frequency bands, reducing path loss and improving throughput, while also reducing hardware costs by allowing Tx hopping with a single PA and shared PLLs.
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Figure CN2023118970_20032025_PF_FP_ABST
Abstract
Description
TRANSMITTER (TX) HOPPING WITH SWITCHING DEVICESBACKGROUND
[0001] Field of the Disclosure
[0002] Certain aspects of the present disclosure generally relate to electronic components and, more particularly, to techniques for transmitter (Tx) hopping.
[0003] Description of Related Art
[0004] Electronic devices include computing devices such as desktop computers, notebook computers, tablet computers, smartphones, wearable devices like a smartwatch, internet servers, and so forth. These various electronic devices provide information, entertainment, social interaction, security, safety, productivity, transportation, manufacturing, and other services to human users. These various electronic devices depend on wireless communications for many of their functions. Wireless communication systems and devices are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems (e.g., a Long Term Evolution (LTE) system or a New Radio (NR) system) . Wireless devices may include a transceiver for processing signals for reception or transmission. A transceiver may include one or more receive chains and one or more transmit chains. The one or more transmit chains may include one or more oscillators and one or more amplifiers, for example. In some implementations, the one or more oscillators may include a phase-locked loop (PLL) with a voltage-controlled oscillator (VCO) for generating an oscillating signal, which may be used for signal processing during signal transmission and reception.SUMMARY
[0005] The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims which follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled “Detailed Description, ” one will understand how the features of this disclosure provide the advantages described herein.
[0006] Certain aspects of the present disclosure are directed towards an apparatus for wireless communication. The apparatus generally includes: a first amplifier; a first switch device coupled to a first transmit chain, a second transmit chain, and a signal input of the first amplifier; a first power supply; a second power supply; and a second switch device coupled to an output of the first power supply, an output of the second power supply, and a supply input of the first amplifier.
[0007] Certain aspects of the present disclosure are directed towards a method for wireless communication. The method generally includes: selectively coupling, via a first switch device, a first transmit chain or a second transmit chain to a signal input of a first amplifier; selectively coupling, via a second switch device, an output of a first power supply or an output of a second power supply to a supply input of the first amplifier; and amplifying, via the first amplifier, a first transmission signal from one of the first transmit chain and the second transmit chain using power from one of the first power supply and the second power supply.
[0008] Certain aspects of the present disclosure are directed towards an apparatus for wireless communication. The apparatus generally includes: means for amplifying; means for selectively coupling a first transmit chain or a second transmit chain to a signal input of the means for amplifying; and means for selectively coupling an output of a first power supply or an output of a second power supply to a supply input of the means for amplifying, wherein the means for amplifying is configured to amplify a transmission signal from the first transmit chain or the second transmit chain using power from the first power supply or the second power supply.
[0009] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.BRIEF DESCRIPTION OF THE DRAWINGS
[0010] So that the manner in which the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects.
[0011] FIG. 1 is a diagram of an example wireless communications network, in which aspects of the present disclosure may be practiced.
[0012] FIG. 2 is a block diagram of an example access point (AP) and example user terminals, in which aspects of the present disclosure may be practiced.
[0013] FIG. 3 is a block diagram of an example transceiver front end, in which aspects of the present disclosure may be practiced.
[0014] FIG. 4A illustrates an example wireless device implemented without transmitter (Tx) hopping.
[0015] FIG. 4B illustrates an example wireless device implemented with Tx hopping.
[0016] FIGs. 5A and 5B illustrate a wireless device implemented with dual Tx hopping.
[0017] FIGs. 6A and 6B illustrate a wireless device having power supplies for amplifiers.
[0018] FIGs. 7A and 7B illustrates a wireless device implemented with Tx hopping using single-pole, double-throw (SPDT) switches, in accordance with certain aspects of the present disclosure.
[0019] FIG. 8 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
[0020] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation.DETAILED DESCRIPTION
[0021] Certain aspects of the present disclosure are directed towards a wireless device with switches to implement transmitter (Tx) hopping for multiple bands. The device may include a power amplifier (PA) for transmission on a first frequency band. A switching device may be used to selectively couple an input of the PA to one of multiple Tx chains, and a switching device may be used to selectively couple a supply input of the PA to the output of one of multiple power supplies. The Tx chains may be shared by one or more other PAs for transmission on a second frequency band. The switching devices may facilitate Tx hopping for the second band, as described in more detail herein.
[0022] EXAMPLE WIRELESS COMMUNICATIONS
[0023] FIG. 1 illustrates a wireless communications system 100 with access points 110 and user terminals 120, in which aspects of the present disclosure may be practiced. For simplicity, only one access point 110 is shown in FIG. 1. An access point (AP) is generally a fixed station that communicates with the user terminals and may also be referred to as a base station (BS) , an evolved Node B (eNB) , a next generation Node B (gNB) , or some other terminology. A user terminal (UT) may be fixed or mobile and may also be referred to as a mobile station (MS) , an access terminal, user equipment (UE) , a station (STA) , a client, a wireless device, or some other terminology. A user terminal may be a wireless device, such as a cellular phone, a personal digital assistant (PDA) , a handheld device, a wireless modem, a laptop computer, a tablet, a personal computer, etc.
[0024] Access point 110 may communicate with one or more user terminals 120 at any given moment on the downlink and uplink. The downlink (i.e., forward link) is the communication link from the access point to the user terminals, and the uplink (i.e., reverse link) is the communication link from the user terminals to the access point. A user terminal may also communicate peer-to-peer with another user terminal. A system controller 130 couples to and provides coordination and control for the access points.
[0025] Wireless communications system 100 employs multiple transmit and multiple receive antennas for data transmission on the downlink and uplink. Access point 110 may be equipped with a number Nap of antennas to achieve transmit diversity for downlink transmissions and / or receive diversity for uplink transmissions. A set Nu of selected user terminals 120 may receive downlink transmissions and transmit uplink transmissions. Each selected user terminal transmits user-specific data to and / or receives user-specific data from the access point. In general, each selected user terminal may be equipped with one or multiple antennas (i.e., Nut ≥1) . The Nu selected user terminals can have the same or different number of antennas.
[0026] Wireless communications system 100 may be a time division duplex (TDD) system or a frequency division duplex (FDD) system. For a TDD system, the downlink and uplink share the same frequency band. For an FDD system, the downlink and uplink use different frequency bands. Wireless communications system 100 may also utilize a single carrier or multiple carriers for transmission. Each user terminal 120 may be equipped with a single antenna (e.g., to keep costs down) or multiple antennas (e.g., where the additional cost can be supported) . In some aspects, one or more of the access points 110 and user terminals 120 may include switches to implement transmitter (Tx) hopping, as described in more detail herein.
[0027] FIG. 2 shows a block diagram of access point 110 and two user terminals 120m and 120x in the wireless communications system 100. Access point 110 is equipped with Nap antennas 224a through 224ap. User terminal 120m is equipped with Nut, m antennas 252ma through 252mu, and user terminal 120x is equipped with Nut, x antennas 252xa through 252xu. Access point 110 is a transmitting entity for the downlink and a receiving entity for the uplink. Each user terminal 120 is a transmitting entity for the uplink and a receiving entity for the downlink. As used herein, a “transmitting entity” is an independently operated apparatus or device capable of transmitting data via a frequency channel, and a “receiving entity” is an independently operated apparatus or device capable of receiving data via a frequency channel. In the following description, the subscript “dn” denotes the downlink, the subscript “up” denotes the uplink, Nup user terminals are selected for simultaneous transmission on the uplink, Ndn user terminals are selected for simultaneous transmission on the downlink, Nup may or may not be equal to Ndn, and Nup and Ndn may be static values or can change for each scheduling interval. Beam-steering, beamforming, or some other spatial processing technique may be used at the access point and / or user terminal.
[0028] On the uplink, at each user terminal 120 selected for uplink transmission, a TX data processor 288 receives traffic data from a data source 286 and control data from a controller 280. TX data processor 288 processes (e.g., encodes, interleaves, and modulates) the traffic data {dup} for the user terminal based on the coding and modulation schemes associated with the rate selected for the user terminal and provides a data symbol stream {sup} for one of the Nut, m antennas. A transceiver front end (TX / RX) 254 (also known as a radio frequency front end (RFFE) ) receives and processes (e.g., converts to analog, amplifies, filters, and frequency upconverts) a respective symbol stream to generate an uplink signal. The transceiver front end 254 may also route the uplink signal to one of the Nut, m antennas for transmit diversity via an RF switch, for example. The controller 280 may control the routing within the transceiver front end 254. Memory 282 may store data and program codes for the user terminal 120 and may interface with the controller 280.
[0029] A number Nup of user terminals 120 may be scheduled for simultaneous transmission on the uplink. Each of these user terminals transmits its set of processed symbol streams on the uplink to the access point.
[0030] At access point 110, Nap antennas 224a through 224ap receive the uplink signals from all Nup user terminals transmitting on the uplink. For receive diversity, a transceiver front end 222 may select signals received from one of the antennas 224 for processing. The signals received from multiple antennas 224 may be combined for enhanced receive diversity. The access point’s transceiver front end 222 also performs processing complementary to that performed by the user terminal’s transceiver front end 254 and provides a recovered uplink data symbol stream. The recovered uplink data symbol stream is an estimate of a data symbol stream {sup} transmitted by a user terminal. An RX data processor 242 processes (e.g., demodulates, deinterleaves, and decodes) the recovered uplink data symbol stream in accordance with the rate used for that stream to obtain decoded data. Decoded data for each user terminal or access terminal may be provided to a data sink (e.g., data sink 244, data sink 272m, or data sink 272x) for storage and / or a controller for further processing.
[0031] On the downlink, at access point 110, a TX data processor 210 receives traffic data from a data source 208 for Ndn user terminals scheduled for downlink transmission, control data from a controller 230 and possibly other data from a scheduler 234. The various types of data may be sent on different transport channels. TX data processor 210 processes (e.g., encodes, interleaves, and modulates) the traffic data for each user terminal based on the rate selected for that user terminal. TX data processor 210 may provide a downlink data symbol streams for one of more of the Ndn user terminals to be transmitted from one of the Nap antennas. The transceiver front end 222 receives and processes (e.g., converts to analog, amplifies, filters, and frequency upconverts) the symbol stream to generate a downlink signal. The transceiver front end 222 may also route the downlink signal to one or more of the Nap antennas 224 for transmit diversity via an RF switch, for example. The controller 230 may control the routing within the transceiver front end 222. Memory 232 may store data and program codes for the access point 110 and may interface with the controller 230.
[0032] At each user terminal 120, Nut, m antennas 252 receive the downlink signals from access point 110. For receive diversity at the user terminal 120, the transceiver front end 254 may select signals received from one or more of the antennas 252 for processing. The signals received from multiple antennas 252 may be combined for enhanced receive diversity. The user terminal’s transceiver front end 254 also performs processing complementary to that performed by the access point’s transceiver front end 222 and provides a recovered downlink data symbol stream. An RX data processor 270 processes (e.g., demodulates, deinterleaves, and decodes) the recovered downlink data symbol stream to obtain decoded data for the user terminal. In some aspects, the transceiver front end 222 or 254 may include switches to implement Tx hopping, as described in more detail herein.
[0033] FIG. 3 is a block diagram of an example transceiver front end 300, such as transceiver front ends 222, 254 in FIG. 2, in which aspects of the present disclosure may be practiced. The transceiver front end 300 includes a transmit (TX) path 302 (also known as a “transmit chain” ) for transmitting signals via one or more antennas and a receive (RX) path 304 (also known as a “receive chain” ) for receiving signals via the antennas. When the TX path 302 and the RX path 304 share an antenna 303, the paths may be connected with the antenna via an interface 306, which may include any of various suitable radio frequency (RF) devices, such as a switch, a duplexer, a diplexer, a multiplexer, and the like.
[0034] Receiving in-phase (I) or quadrature (Q) baseband analog signals from a digital-to-analog converter (DAC) 308, the TX path 302 may include a baseband filter (BBF) 310, a mixer 312, a driver amplifier (DA) 314, and a power amplifier (PA) 316. The BBF 310, the mixer 312, and the DA 314 may be included in a radio frequency integrated circuit (RFIC) . In some cases, the PA 316 may be external to the RFIC.
[0035] The BBF 310 filters the baseband signals received from the DAC 308, and the mixer 312 mixes the filtered baseband signals with a transmit local oscillator (LO) signal to convert the baseband signal of interest to a different frequency (e.g., upconvert from baseband to RF) . This frequency-conversion process produces the sum and difference frequencies of the LO frequency and the frequency of the signal of interest. The sum and difference frequencies are referred to as the “beat frequencies. ” The beat frequencies are typically in the RF range, such that the signals output by the mixer 312 are typically RF signals, which may be amplified by the DA 314 and / or by the PA 316 before transmission by the antenna 303. While one mixer 312 is illustrated, several mixers may be used to upconvert the filtered baseband signals to one or more intermediate frequencies and to thereafter upconvert the intermediate frequency (IF) signals to a frequency for transmission.
[0036] In some cases, the DA 314 and / or the PA 316 may be selectively coupled to different transmit chains and power supplies, facilitating Tx hopping for different bands, as described in more detail herein.
[0037] The RX path 304 includes a low noise amplifier (LNA) 322, a mixer 324, and a baseband filter (BBF) 326. The LNA 322, the mixer 324, and the BBF 326 may be included in a radio frequency integrated circuit (RFIC) , which may or may not be the same RFIC that includes the TX path components. RF signals received via the antenna 303 may be amplified by the LNA 322, and the mixer 324 mixes the amplified RF signals with a received local oscillator (LO) signal to convert the RF signal of interest to a different baseband frequency (i.e., downconvert) . The baseband signals output by the mixer 324 may be filtered by the BBF 326 before being converted by an analog-to-digital converter (ADC) 328 to digital I and / or Q signals for digital signal processing.
[0038] Certain transceivers may employ frequency synthesizers with a variable-frequency oscillator (e.g., a voltage-controlled oscillator (VCO) or a digitally controlled oscillator (DCO) ) to generate a stable, tunable LO with a particular tuning range. Thus, the transmit LO frequency may be produced by a TX frequency synthesizer 318, which may be buffered or amplified by amplifier 320 before being mixed with the baseband signals in the mixer 312. Similarly, the receive LO frequency may be produced by an RX frequency synthesizer 330, which may be buffered or amplified by amplifier 332 before being mixed with the RF signals in the mixer 324. In some cases, a single frequency synthesizer may be used for both the TX path 302 and the RX path 304.
[0039] EXAMPLE TECHNIQUES FOR TRANSMITTER HOPPING
[0040] Tx hopping generally refers to switching (e.g., hopping) between different transmitters (e.g., transmit chains) for signal communication, as described in more detail herein. Transmitter (Tx) hopping reduces inserted path loss of a wireless device when switching from one transmit antenna to another. Tx hopping may be implemented for any suitable communication technology, such as standalone (SA) , uplink carrier aggregation (ULCA) , uplink (UL) multiple-input multiple-output (MIMO) , dual connectivity (DC) , or dual-subscriber identity module (SIM) dual-active (DSDA) technologies, which may include one or two activated Tx chains (e.g., transmit paths 302) .
[0041] FIG. 4A illustrates an example wireless device 400 implemented without Tx hopping. FIG. 4A shows a first configuration of the wireless device 400 prior to antenna switching (without Tx hopping) and a second configuration of the wireless device 400 after antenna switching (without Tx hopping) . The wireless device 400 may include a transceiver 412 (e.g., a transceiver integrated circuit (IC) ) with a Tx chain (Tx0) for a standalone (SA) band. Tx0 may be coupled to a transmit portion of a low noise amplifier (LNA) and power amplifier (PA) module including duplexers (LPAMIDs) 402 for signal transmission through a switching device 404. An LPAMID may include an LNA (e.g., LNA 322 of FIG. 3) , a PA (e.g., PA 316 of FIG. 3) and one or more duplexers (e.g., as part of interface 306) between the LNA and PA. LPAMID 402 may include a first PA (labeled “1st PA” ) . As shown, the switching device 404 may selectively couple one of antenna 0 (ANT0) , antenna 1 (ANT1) , antenna 2 (ANT2) , and antenna 3 (ANT3) to one of LPAMID 402, diversity receiver (DRx) module 1 (labeled “DRx Module #1” ) , DRx module 2 (labeled “DRx Module #2” ) , and DRx module 3 (labeled “DRx Module #3” ) . LPAMID 402 may be used for signal transmission and primary reception (PRx) , DRx module 1 may be used for diversity reception (DRx) , DRx module 2 may be used for primary reception for MIMO, and DRX module 3 may be used for diversity reception for MIMO. As shown, the PA of LPAMID 402 may be used to transmit a signal via ANT0. The switching device 404 may be reconfigured to transmit a signal via ANT2, in some aspects. Without Tx hopping, switching transmission from ANT0 to ANT2 may result in an increased path loss due to an increased routing distance and losses associated with the switching device 404.
[0042] FIG. 4B illustrates an example wireless device 450 implemented with Tx hopping. FIG. 4B shows a first configuration of the wireless device 400 prior to Tx hopping and a second configuration of the wireless device 400 after Tx hopping. As shown, the wireless device 450 may also include LPAMID 406. The transceiver 412 may include another Tx chain (Tx1) . Tx0 may be coupled to LPAMID 402, and Tx1 may be coupled to LPAMID 406. LPAMID 406 may include a second PA (labeled “2nd PA” ) . As shown, the PA of LPAMID 402 may be used for signal transmission via ANT0 through a switching device 408. To transmit via ANT2, Tx1 may be used. For example, Tx1 may be used to transmit a signal via LPAMID 406, through another switching device 410 and via ANT2. With Tx hopping, 1-2 dB (e.g., for mid-high band (MHB) ) or 2-3 dB (e.g., for ultra-high band (UHB) ) of path loss may be saved (e.g., by using Tx1 for transmission on ANT2 as described with respect to FIG. 4B as compared to using Tx0 for transmission on ANT2 as described with respect to FIG. 4A) . Moreover, increased throughput (e.g., up to 50%throughput improvement) may be obtained (e.g., for weak network coverage) based on 2-3 dB gain on the new Tx path by using Tx hopping. As shown, MIMO PRx is implemented with LPAMID 406, and MIMO DRx is implemented with DRx Module #2 (e.g., instead of DRx Module #3 in FIG. 4A) .
[0043] FIGs. 5A and 5B illustrate a wireless device 500 implemented with dual Tx hopping. Tx hopping may be implemented with two Tx chains. Two activated Tx chains (e.g., Tx0 and Tx1) may be used concurrently for various smartphone and other wireless device designs. FIG. 5A shows a first configuration of the wireless device 500 prior to Tx hopping and FIG. 5B shows a second configuration of the wireless device 500 after Tx hopping.
[0044] As shown, the wireless device 500 may include LPAMID 502 (e.g., including a third PA, labeled “3rd PA” ) coupled to Tx1 and LPAMID 504 (e.g., including a fourth PA, labeled “4th PA” ) coupled to Tx0. A transmit signal from Tx1 may be amplified via the PA of LPAMID 502 for transmission via antenna 4 (ANT4) or antenna 5 (ANT5) through switch 506, as shown. A transmit signal from Tx0 may be amplified via the PA of LPAMID 504 for transmission via antenna 6 (ANT6) or antenna 7 (ANT7) through switching device 508, as shown. ANT0, ANT1, ANT2, ANT3 may be used for transmission using a first frequency band (e.g., MHB) , and ANT4, ANT5, ANT6, ANT7 may be used for transmission using a second frequency band (e.g., UHB) . As shown in FIG. 5A, Tx0 coupled to LPAMID 402 may share the same PLL 530 in the transceiver 412 as Tx0 coupled to LPAMID 504. Similarly, Tx1 coupled to LPAMID 406 may share the same PLL 532 in the transceiver 412 as Tx1 coupled to LPAMID 502. Upon Tx hopping from Tx0 to Tx1 for MHB (e.g., hopping from transmission via ANT0 to ANT2) as shown, Tx hopping should also occur from Tx1 to Tx0 for UHB (e.g., hopping from transmission via ANT4 to ANT 6) because Tx0 coupled to LPAMID 402 and LPAMID 504 only has a single PLL 530 and Tx1 coupled to LPAMID 406 and LPAMID 502 only has a single PLL, in this case. Thus, transmission on MHB and UHB cannot occur simultaneously using the same Tx chain.
[0045] FIGs. 6A and 6B illustrate a wireless device 600 having power supplies for the LPAMIDs. FIG. 6A shows a first configuration of the wireless device 600 prior to Tx hopping and FIG. 6B shows a second configuration of the wireless device 600 after Tx hopping. As shown, ANT0 or ANT1 may be used for transmission on low band (LB) . Transmit circuitry for some bands (e.g., LB) may be implemented with only a single PA without Tx hopping. For instance, wireless device 600 may only use LPAMID 402 (e.g., coupled to Tx0) for LB transmission. Any other band (e.g., MHB) combined with LB may also not support Tx hopping. For example, when Tx0 is being used for LB transmission, MHB transmission should be performed using Tx1 and should not be switched to Tx0 since the PLL for Tx0 is being used for LB transmission. Moreover, a power supply conflict may be present. As shown, power supply 602 may be used to supply power for the PAs of LPAMIDs 402, 504 coupled to Tx0, and power supply 604 may be used to supply power for the PA of LPAMID 502. Each power supply may only be able to supply power to one LPAMID at a time. Thus, while power supply 602 is supplying power to LPAMID 402 for signal transmission, LPAMID 504 should not be used. Thus, Tx chain and power supply conflicts (e.g., represented by “X” and labeled “Tx Chain Conflict” in FIG. 6) exist that prevent Tx hopping for MHB during LB transmission.
[0046] FIGs. 7A and 7B illustrate a wireless device 700 implemented with Tx hopping using single-pole, double-throw (SPDT) switches, in accordance with certain aspects of the present disclosure. FIG. 7A shows a first configuration of the wireless device 700 prior to Tx hopping and FIG. 7B shows a second configuration of the wireless device 700 after Tx hopping. As shown, an SPDT switch 702 may be coupled to LPAMID 402, Tx0, and Tx1. The SPDT switch 702 may have a pole terminal coupled to an input of LPAMID 402, a first throw terminal coupled to Tx0, and a second throw terminal coupled to Tx1. Thus, the SPDT switch 702 selectively couples one of Tx0 and Tx1 to the input of LPAMID 402. The wireless device 700 may also include an SPDT switch 704. The SPDT switch 704 may include a pole terminal coupled to a supply input of LPAMID 402, a first throw terminal coupled to an output of power supply 602, and a second throw terminal coupled to an output of power supply 604. The SPDT switch 704 selectively couples one of the outputs of the power supplies 602, 604 to the supply input of LPAMID 402. With the SPDT switches 702, 704, Tx hopping may be implemented for multiple bands (e.g., LB and MHB) , even with circuitry for one of the bands (e.g., LB) having only one PA and sharing PLLs, saving hardware cost.
[0047] As shown in FIG. 7A, before Tx hopping, the SPDT switch 702 may be configured to couple Tx0 to the input of LPAMID 402, and SPDT switch 704 may be configured to couple the output of power supply 602 to the supply input of LPAMID 402. Thus, the PA of LPAMID 402 may amplify a transmission signal from Tx0 using power from the power supply 602 for transmission via ANT0. Moreover, the PA of LPAMID 502 may amplify a transmission signal from Tx1 using power from the power supply 604 for transmission via ANT4.
[0048] As shown in FIG. 7B, after Tx hopping, the SPDT switch 702 may be configured to couple Tx1 to the input of LPAMID 402, and SPDT switch 704 may be configured to couple the output of power supply 604 to the supply input of LPAMID 402. Thus, the PA of LPAMID 402 may amplify a transmission signal from Tx1 using power from the power supply 604 for transmission via ANT0. Moreover, the PA of LPAMID 504 may amplify a transmission signal from Tx0 using power from the power supply 602 for transmission via ANT6. In this manner, Tx hopping may occur for both LB and MHB with only a single PA for LB transmission and with sharing of PLLs as described herein. Thus, hardware cost may be saved by using one LB PA (e.g., LPAMID) .
[0049] FIG. 8 is a flow diagram illustrating example operations 800 for wireless communication. The operations 800 may be performed, for example, by a wireless device, such as the wireless device 700.
[0050] At block 802, the wireless device selectively couples, via a first switch device (e.g., switch 702) , a first transmit chain (e.g., Tx0) or a second transmit chain (e.g., Tx1) to a signal input of a first amplifier (e.g., PA of LPAMID 402) . At block 804, the wireless device selectively couples, via a second switch device (e.g., switch 704) , an output of a first power supply (e.g., power supply 602) or an output of a second power supply (e.g., power supply 604) to a supply input of the first amplifier. At block 806, the wireless device amplifies, via the first amplifier, a first transmission signal from one of the first transmit chain and the second transmit chain using power from one of the first power supply and the second power supply.
[0051] In some aspects, the wireless device amplifies, via a second amplifier (e.g., PA of LPAMID 504) , a second transmission signal from another one of the first transmit chain and the second transmit chain using power from another one of the first power supply and the second power supply (e.g., a different transmit chain and a different power supply than that used in block 806) . In some aspects, a supply input of the second amplifier may be coupled to the output of the first power supply. In some cases, a supply input of a third amplifier (e.g., PA of LPAMID 502) may be coupled to the output of the second power supply.
[0052] In some aspects, the first transmission signal is amplified via the first amplifier for transmission for a first band (e.g., LB) . The second transmission signal may be amplified via the second amplifier for transmission for a second band (e.g., MHB) . The first amplifier may be the only amplifier used to amplify signals for transmission for the first band. In some aspects, the wireless device may selectively couple, via a third switch device (e.g., switching device 408) , an output of the first amplifier to a first antenna (e.g., ANT0) or a second antenna (e.g., ANT1) .
[0053] Certain aspects of the present disclosure provide a low-cost LB design to enable Tx hopping. Tx hopping may be enabled for MHB or UHB when used in combination with LB (e.g., implemented with only a single PA) . MHB / UHB Tx hopping from Tx1 to Tx0 may be enabled while LB Tx hopping from Tx0 to Tx1 is performed. As described, the Tx chain and power supply used for LB transmission may be swapped. Thus, certain aspects use two SPDT switches and one LB PA to enable Tx hopping when used with another band, saving hardware costs. The design described herein may be used for LB applications that only have a single LB PA (e.g., including a PA of any integrated RFFE module, such as a power amplifier front-end (PAF) , LNA and PA front-end (LPAF) , PA module including duplexers (PAMID) , or LPAMID) , although the techniques described herein may be applied for any suitable application and / or band combinations. For example, the techniques described herein may support Tx hopping for MHB / UHB transmission with one PA in combination with transmission on another band using two SPDT switches to provide a low-cost design and improve Tx performance (e.g., enabling Tx hopping) .
[0054] EXAMPLE ASPECTS
[0055] In addition to the various aspects described above, specific combinations of aspects are within the scope of the disclosure, some of which are detailed below:
[0056] Aspect 1: An apparatus for wireless communication, comprising: a first amplifier; a first switch device coupled to a first transmit chain, a second transmit chain, and a signal input of the first amplifier; a first power supply; a second power supply; and a second switch device coupled to an output of the first power supply, an output of the second power supply, and a supply input of the first amplifier.
[0057] Aspect 2: The apparatus of Aspect 1, further comprising: a second amplifier having an input coupled to the first transmit chain; and a third amplifier having an input coupled to the second transmit chain.
[0058] Aspect 3: The apparatus of Aspect 2, wherein: a supply input of the second amplifier is coupled to the output of the first power supply; and a supply input of the third amplifier is coupled to the output of the second power supply.
[0059] Aspect 4: The apparatus of Aspect 2 or 3, further comprising: a third switch device coupled to an output of the second amplifier, a first antenna, and a second antenna; and a fourth switch device coupled to an output of the third amplifier, a third antenna, and a fourth antenna.
[0060] Aspect 5: The apparatus according to any of Aspects 2–4, wherein: the first amplifier is configured to amplify signals for transmission for a first band; and the second amplifier and the third amplifier are configured to amplify signals for transmission for a second band.
[0061] Aspect 6: The apparatus of Aspect 5, wherein the first amplifier is the only amplifier of the apparatus configured to amplify signals for transmission for the first band.
[0062] Aspect 7: The apparatus according to any of Aspects 1–6, wherein the first switch device comprises a single-pole, double-throw (SPDT) switch having a pole terminal coupled to the signal input of the first amplifier, a first throw terminal coupled to the first transmit chain, and a second throw terminal coupled to the second transmit chain.
[0063] Aspect 8: The apparatus according to any of Aspects 1–7, wherein the second switch device comprises a single-pole, double-throw (SPDT) switch having a pole terminal coupled to the supply input of the first amplifier, a first throw terminal coupled to the output of the first power supply, and a second throw terminal coupled to the output of the second power supply.
[0064] Aspect 9: The apparatus according to any of Aspects 1–8, wherein the first amplifier is configured to amplify a transmission signal from the first transmit chain or the second transmit chain for transmission via an antenna.
[0065] Aspect 10: The apparatus of Aspect 9, wherein the first amplifier is configured to amplify the transmission signal using power from the first power supply or the second power supply.
[0066] Aspect 11: The apparatus according to any of Aspects 1–10, further comprising a third switch device coupled to an output of the first amplifier, a first antenna, and a second antenna.
[0067] Aspect 12: The apparatus according to any of Aspects 1–11, wherein: the first transmit chain comprises a first phase-locked loop (PLL) ; and the second transmit chain comprises a second PLL.
[0068] Aspect 13: The apparatus according to any of Aspects 1–12, further comprising a transceiver integrated circuit (IC) comprising the first transmit chain and the second transmit chain.
[0069] Aspect 14: A method for wireless communication, comprising: selectively coupling, via a first switch device, a first transmit chain or a second transmit chain to a signal input of a first amplifier; selectively coupling, via a second switch device, an output of a first power supply or an output of a second power supply to a supply input of the first amplifier; and amplifying, via the first amplifier, a first transmission signal from one of the first transmit chain and the second transmit chain using power from one of the first power supply and the second power supply.
[0070] Aspect 15: The method of Aspect 14, further comprising amplifying, via a second amplifier, a second transmission signal from another one of the first transmit chain and the second transmit chain using power from another one of the first power supply and the second power supply.
[0071] Aspect 16: The method of Aspect 15, wherein: a supply input of the second amplifier is coupled to the output of the first power supply; and a supply input of a third amplifier is coupled to the output of the second power supply.
[0072] Aspect 17: The method of Aspect 15 or 16, wherein: the first transmission signal is amplified via the first amplifier for transmission for a first band; and the second transmission signal is amplified via the second amplifier for transmission for a second band.
[0073] Aspect 18: The method of Aspect 17, wherein the first amplifier is the only amplifier used to amplify signals for transmission for the first band.
[0074] Aspect 19: The method according to any of Aspects 14–18, further comprising selectively coupling, via a third switch device, an output of the first amplifier to a first antenna or a second antenna.
[0075] Aspect 20: An apparatus for wireless communication, comprising: means for amplifying; means for selectively coupling a first transmit chain or a second transmit chain to a signal input of the means for amplifying; and means for selectively coupling an output of a first power supply or an output of a second power supply to a supply input of the means for amplifying, wherein the means for amplifying is configured to amplify a transmission signal from the first transmit chain or the second transmit chain using power from the first power supply or the second power supply.
[0076] ADDITIONAL CONSIDERATIONS
[0077] Within the present disclosure, the word “exemplary” is used to mean “serving as an example, instance, or illustration. ” Any implementation or aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects of the disclosure. Likewise, the term “aspects” does not require that all aspects of the disclosure include the discussed feature, advantage, or mode of operation. The term “coupled” is used herein to refer to the direct or indirect coupling between two objects. For example, if object A physically touches object B and object B touches object C, then objects A and C may still be considered coupled to one another-even if objects A and C do not directly physically touch each other. For instance, a first object may be coupled to a second object even though the first object is never directly physically in contact with the second object. The terms “circuit” and “circuitry” are used broadly and intended to include both hardware implementations of electrical devices and conductors that, when connected and configured, enable the performance of the functions described in the present disclosure, without limitation as to the type of electronic circuits.
[0078] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) , and the like. Also, “determining” may include resolving, selecting, choosing, establishing, and the like.
[0079] The apparatus and methods described in the detailed description are illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements” ) . The various operations or methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component (s) and / or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor. Generally, where there are operations illustrated in figures, those operations may have corresponding counterpart means-plus-function components with similar numbering.
[0080] One or more of the components, steps, features, and / or functions illustrated herein may be rearranged and / or combined into a single component, step, feature, or function or embodied in several components, steps, or functions. Additional elements, components, steps, and / or functions may also be added without departing from features disclosed herein. The apparatus, devices, and / or components illustrated herein may be configured to perform one or more of the methods, features, or steps described herein.
[0081] It is to be understood that the specific order or hierarchy of steps in the methods disclosed is an illustration of exemplary processes. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the methods may be rearranged. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented unless specifically recited therein.
[0082] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” Unless specifically stated otherwise, the term “some” refers to one or more. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover at least: a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) . All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. § 112 (f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for. ” For example, means for selectively coupling may include a switching device, such as the switching device 702 or switching device 704. Means for amplifying may include an amplifier, such as a PA of LPAMID 402.
[0083] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.
Claims
1.An apparatus for wireless communication, comprising:a first amplifier;a first switch device coupled to a first transmit chain, a second transmit chain, and a signal input of the first amplifier;a first power supply;a second power supply; anda second switch device coupled to an output of the first power supply, an output of the second power supply, and a supply input of the first amplifier.2.The apparatus of claim 1, further comprising:a second amplifier having an input coupled to the first transmit chain; anda third amplifier having an input coupled to the second transmit chain.3.The apparatus of claim 2, wherein:a supply input of the second amplifier is coupled to the output of the first power supply; anda supply input of the third amplifier is coupled to the output of the second power supply.4.The apparatus of claim 2, further comprising:a third switch device coupled to an output of the second amplifier, a first antenna, and a second antenna; anda fourth switch device coupled to an output of the third amplifier, a third antenna, and a fourth antenna.5.The apparatus of claim 2, wherein:the first amplifier is configured to amplify signals for transmission for a first band; andthe second amplifier and the third amplifier are configured to amplify signals for transmission for a second band.6.The apparatus of claim 5, wherein the first amplifier is the only amplifier of the apparatus configured to amplify signals for transmission for the first band.7.The apparatus of claim 1, wherein the first switch device comprises a single-pole, double-throw (SPDT) switch having a pole terminal coupled to the signal input of the first amplifier, a first throw terminal coupled to the first transmit chain, and a second throw terminal coupled to the second transmit chain.8.The apparatus of claim 1, wherein the second switch device comprises a single-pole, double-throw (SPDT) switch having a pole terminal coupled to the supply input of the first amplifier, a first throw terminal coupled to the output of the first power supply, and a second throw terminal coupled to the output of the second power supply.9.The apparatus of claim 1, wherein the first amplifier is configured to amplify a transmission signal from the first transmit chain or the second transmit chain for transmission via an antenna.10.The apparatus of claim 9, wherein the first amplifier is configured to amplify the transmission signal using power from the first power supply or the second power supply.11.The apparatus of claim 1, further comprising a third switch device coupled to an output of the first amplifier, a first antenna, and a second antenna.12.The apparatus of claim 1, wherein:the first transmit chain comprises a first phase-locked loop (PLL) ; andthe second transmit chain comprises a second PLL.13.The apparatus of claim 1, further comprising a transceiver integrated circuit (IC) comprising the first transmit chain and the second transmit chain.14.A method for wireless communication, comprising:selectively coupling, via a first switch device, a first transmit chain or a second transmit chain to a signal input of a first amplifier;selectively coupling, via a second switch device, an output of a first power supply or an output of a second power supply to a supply input of the first amplifier; andamplifying, via the first amplifier, a first transmission signal from one of the first transmit chain and the second transmit chain using power from one of the first power supply and the second power supply.15.The method of claim 14, further comprising amplifying, via a second amplifier, a second transmission signal from another one of the first transmit chain and the second transmit chain using power from another one of the first power supply and the second power supply.16.The method of claim 15, wherein:a supply input of the second amplifier is coupled to the output of the first power supply; anda supply input of a third amplifier is coupled to the output of the second power supply.17.The method of claim 15, wherein:the first transmission signal is amplified via the first amplifier for transmission for a first band; andthe second transmission signal is amplified via the second amplifier for transmission for a second band.18.The method of claim 17, wherein the first amplifier is the only amplifier used to amplify signals for transmission for the first band.19.The method of claim 14, further comprising selectively coupling, via a third switch device, an output of the first amplifier to a first antenna or a second antenna.20.An apparatus for wireless communication, comprising:means for amplifying;means for selectively coupling a first transmit chain or a second transmit chain to a signal input of the means for amplifying; andmeans for selectively coupling an output of a first power supply or an output of a second power supply to a supply input of the means for amplifying, wherein the means for amplifying is configured to amplify a transmission signal from the first transmit chain or the second transmit chain using power from the first power supply or the second power supply.
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