A radio frequency receiving switch circuit and a radio frequency front-end chip

Abstract

The application discloses a radio frequency receiving switch circuit, which comprises a compensation circuit in addition to a diversity receiving switch and a filter; wherein the first end of the diversity receiving switch is connected with an antenna, the second end of the diversity receiving switch is connected with the first end of the filter, the second end of the filter is connected with a radio frequency transceiver; the compensation circuit is connected with the filter, and by adjusting the compensation circuit, the impedance of the filter can be compensated to a target impedance when the impedance of the filter deviates from the target impedance, so that the situation that the diversity receiving switch is connected with one or more filters is adapted, the target impedance of each filter is ensured, and the transmission quality of signals is further stabilized. The application also discloses a radio frequency front-end chip, which has the above beneficial effects.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a radio frequency receiving switch circuit and a radio frequency front-end chip. Background Technology

[0002] Radio frequency (RF) front-end chips are a core component of mobile smart terminal products, mainly including power amplifiers, antenna switches, filters, duplexers, and low-noise amplifiers (LNAs). The RF receiver switch circuit is a crucial part of the RF front-end chip, primarily composed of diversity receiver switches and filters. The connection methods between diversity receiver switches and filters include one diversity receiver switch connected to one filter, and one diversity receiver switch connected to multiple filters. To ensure signal transmission quality, each filter impedance must maintain a standard impedance, such as 50Ω. This requirement is met when one diversity receiver switch is connected to one filter. However, for RF receiver switch circuits with one diversity receiver switch connected to multiple filters, when the frequency bands corresponding to each filter are simultaneously selected, the circuit formed between the filters will cause the impedance of each filter to deviate from the standard impedance, affecting signal transmission quality.

[0003] Ensuring the signal transmission quality of the RF receiver switching circuit is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide an RF receiver switch circuit and an RF front-end chip, which improves the signal transmission quality of the RF receiver switch circuit compared to the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides an RF receiving switch circuit, including a diversity receiving switch, a filter, and a compensation circuit;

[0006] The first terminal of the diversity receiving switch is connected to the antenna, the second terminal of the diversity receiving switch is connected to the first terminal of the filter, and the second terminal of the filter is connected to the radio frequency transceiver; the compensation circuit is connected to the filter and is used to compensate the impedance of the filter to the target impedance when the impedance of the filter deviates from the target impedance.

[0007] Optionally, the compensation circuit specifically includes a switch and a compensation resistor;

[0008] The first terminal of the switch is connected to the second terminal of the diversity receiving switch and the first terminal of the filter, the second terminal of the switch is connected to the first terminal of the compensation resistor, and the second terminal of the compensation resistor is grounded.

[0009] Optionally, the switch is specifically a miniature toggle switch.

[0010] Optionally, the switch is specifically an electronic switch.

[0011] Optionally, it may also include a first detection circuit and a first controller;

[0012] The first detection circuit is used to detect the circuit parameters of the filter; the first controller is connected to the control terminal of the first detection circuit and the electronic switch respectively, and is used to control the electronic switch to turn on so that the compensation resistor compensates for the impedance of the filter when it is determined from the circuit parameters that the impedance of the filter deviates from the target impedance.

[0013] Optionally, the compensation resistor is specifically a potentiometer.

[0014] Optionally, a second detection circuit and a second controller may also be included;

[0015] The second detection circuit is used to detect the circuit parameters of the filter; the second controller is connected to the control terminal of the second detection circuit and the potentiometer respectively, and is used to adjust the resistance value of the potentiometer so that the potentiometer compensates the impedance of the filter to the target impedance when it is determined from the circuit parameters that the impedance of the filter deviates from the target impedance.

[0016] Optionally, the target impedance is specifically 50Ω.

[0017] Optionally, the compensation circuit is specifically disposed on the packaging carrier board.

[0018] To address the aforementioned technical problems, the present invention also provides an RF front-end chip, comprising the RF receiver switch circuit described in any one of the above claims.

[0019] The radio frequency (RF) receiver switch circuit provided by this invention includes a compensation circuit in addition to a diversity receiver switch and a filter. The first terminal of the diversity receiver switch is connected to the antenna, the second terminal of the diversity receiver switch is connected to the first terminal of the filter, and the second terminal of the filter is connected to the RF transceiver. The compensation circuit is connected to the filter. By adjusting the compensation circuit, when the impedance of the filter deviates from the target impedance, the filter impedance is compensated to the target impedance, thereby adapting to the situation where the diversity receiver switch is connected to one or more filters, ensuring that each filter maintains the target impedance, and thus stabilizing the signal transmission quality. This invention also provides an RF front-end chip with the above-mentioned beneficial effects, which will not be elaborated further here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a radio frequency receiving switch circuit provided in an embodiment of the present invention;

[0022] Figure 2 A circuit diagram of a radio frequency receiving switch circuit provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a radio frequency front-end chip provided in an embodiment of the present invention. Detailed Implementation

[0024] The core of this invention is to provide an RF receiving switch circuit and an RF front-end chip, which improves the signal transmission quality of the RF receiving switch circuit compared to the prior art.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Figure 1 This is a schematic diagram of a radio frequency receiving switch circuit provided in an embodiment of the present invention.

[0027] like Figure 1 As shown, the radio frequency receiving switch circuit provided in this embodiment of the invention includes a diversity receiving switch K, filters (Band 1, Band 2, etc.) and a compensation circuit;

[0028] The first terminal of the diversity reception switch K is connected to the antenna, the second terminal of the diversity reception switch K is connected to the first terminal of the filter, and the second terminal of the filter is connected to the radio frequency transceiver. The compensation circuit is connected to the filter and is used to compensate the impedance of the filter to the target impedance when the impedance of the filter deviates from the target impedance.

[0029] In practice, the target impedance can be 50Ω.

[0030] Compensation circuits are not limited to components such as switches, resistors, inductors, and capacitors. The impedance of each filter is pre-calculated based on its internal circuitry, considering that a diversity receiver switch K selects multiple filter frequency bands. Corresponding circuits are then designed to compensate the impedance of each filter to the target impedance. When a diversity receiver switch K connects to two or more filters, the degree to which the impedance of each filter deviates from the target impedance varies depending on the number of filters selected. Therefore, the number of impedance compensation values ​​that the compensation circuit connected to each filter can provide depends on the number of filter selections.

[0031] During installation, the compensation circuit can be specifically set on the package carrier board.

[0032] The radio frequency receiving switch circuit provided in this embodiment of the invention uses a compensation circuit to compensate the impedance of the filter according to the pre-designed correspondence between different gating modes and different compensation methods, so that the impedance of the filter is maintained at the target impedance.

[0033] The radio frequency receiving switch circuit provided in this embodiment of the invention includes a compensation circuit in addition to a diversity receiving switch and a filter. The first terminal of the diversity receiving switch is connected to the antenna, the second terminal of the diversity receiving switch is connected to the first terminal of the filter, and the second terminal of the filter is connected to the radio frequency transceiver. The compensation circuit is connected to the filter. By adjusting the compensation circuit, when the impedance of the filter deviates from the target impedance, the impedance of the filter is compensated to the target impedance, thereby adapting to the situation where the diversity receiving switch is connected to one or more filters, ensuring that each filter maintains the target impedance, and thus stabilizing the signal transmission quality.

[0034] Figure 2 This is a circuit diagram of a radio frequency receiving switch circuit provided in an embodiment of the present invention.

[0035] Based on the above embodiments, in the radio frequency receiving switch circuit provided in the embodiments of the present invention, such as Figure 2 As shown, the compensation circuit specifically includes switches (S1, S2, etc.) and compensation resistors (R1, R2, etc.).

[0036] The first terminal of the switch is connected to the second terminal of the diversity receiving switch K and the first terminal of the filter. The second terminal of the switch is connected to the first terminal of the compensation resistor, and the second terminal of the compensation resistor is grounded.

[0037] In practice, a miniature toggle switch can be used.

[0038] Furthermore, the switch can also be an electronic switch. Based on this, the radio frequency receiving switch circuit provided in this embodiment of the invention may further include a first detection circuit and a first controller;

[0039] The first detection circuit is used to detect the circuit parameters of the filter; the first controller is connected to the control terminal of the first detection circuit and the electronic switch respectively, and is used to control the electronic switch to turn on so that the compensation resistor compensates for the impedance of the filter when the impedance of the filter deviates from the target impedance according to the circuit parameters.

[0040] The switch can be an electronic switch, such as a relay or MOSFET. A program to calculate the filter impedance based on circuit parameters (such as the current and voltage at the filter's front end) is pre-loaded into the first controller. When the RF receiving switch circuit is put into use, the first controller adjusts the on / off state of the switch in the compensation circuit in real time based on the filter-related circuit parameters detected by the first detection circuit, thereby flexibly compensating for the filter impedance.

[0041] The compensation resistor can specifically be a potentiometer. Furthermore, the RF receiving switch circuit provided in this embodiment of the invention may further include a second detection circuit and a second controller;

[0042] The second detection circuit is used to detect the circuit parameters of the filter; the second controller is connected to the control terminal of the second detection circuit and the potentiometer respectively, and is used to adjust the resistance value of the potentiometer so that the potentiometer compensates the impedance of the filter to the target impedance when the impedance of the filter deviates from the target impedance according to the circuit parameters.

[0043] The compensation circuit can use an adjustable potentiometer. A program to calculate the filter impedance based on circuit parameters (such as the current and voltage at the filter's front end) is pre-loaded into the second controller. When the RF receiving switch circuit is put into use, the second controller adjusts the on / off state of the switches in the compensation circuit in real time based on the filter-related circuit parameters detected by the second detection circuit, thereby flexibly compensating for the filter impedance.

[0044] In practical applications, the first controller and the second controller can coexist and their functions can be implemented by the same controller. Correspondingly, the first detection circuit and the second detection circuit can also be the same detection circuit.

[0045] The various embodiments corresponding to the radio frequency receiving switch circuit have been described in detail above. Based on this, the present invention also discloses a radio frequency front-end chip corresponding to the above-described radio frequency receiving switch circuit.

[0046] Figure 3 This is a schematic diagram of the structure of a radio frequency front-end chip provided in an embodiment of the present invention.

[0047] The radio frequency front-end chip provided in this embodiment of the invention includes any one of the radio frequency receiving switch circuits described above.

[0048] Furthermore, such as Figure 3As shown, the RF front-end chip mainly consists of a main block and a diversity block. The RF receiver switching circuit is located in the diversity block (e.g., ...). Figure 3 As shown in the dashed box, its input is connected to the diversity receivers (DRx L / M / H) of different frequency bands, its output is connected to the first end of the transceiver, the second end of the transceiver is connected to the primary frequency band module (Primary LB / MB / HB) of the main module used to connect the primary antenna module (Primary ANT L / M / H), the third end of the transceiver is connected to the communication module (including GPS, Wi-Fi, BT, etc.), and the other end of the communication module is connected to the communication network (GPS, WLAN, 2.4G, 5G, etc.).

[0049] The diversity receiving module may include multiple radio frequency receiving switch circuits. Each radio frequency receiving switch circuit consists of a diversity receiving switch K and one or more filters. According to the impedance deviation of the filter after each radio frequency receiving switch circuit is working, a compensation circuit is set in it to perform impedance compensation of different degrees on the filter.

[0050] Since the embodiments of the RF front-end chip section correspond to the embodiments of the RF receiver switch circuit section, please refer to the description of the embodiments of the RF receiver switch circuit section for the embodiments of the RF front-end chip section, which will not be repeated here.

[0051] The present invention has provided a detailed description of an RF receiving switch circuit and an RF front-end chip. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the RF front-end chip disclosed in the embodiments, since it corresponds to the RF receiving switch circuit disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the description of the RF receiving switch circuit. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0052] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A radio frequency receive switch circuit, characterized by The radio frequency receiving switch circuit comprises a diversity receiving switch, a filter, a compensation circuit, a first detection circuit and a first controller. The first end of the diversity receiving switch is connected with an antenna, the second end of the diversity receiving switch is connected with the first end of the filter, and the second end of the filter is connected with a radio frequency transceiver. The diversity receiving switch is connected with two or more filters. The number of impedance compensation values provided by the compensation circuit connected with each filter is determined according to the number of gating conditions of the filter. The compensation circuit specifically comprises a switch and a compensation resistor. The first end of the switch is connected with the second end of the diversity receiving switch and the first end of the filter, the second end of the switch is connected with the first end of the compensation resistor, and the second end of the compensation resistor is grounded. The switch is specifically an electronic switch. The first detection circuit is used for detecting a circuit parameter of the filter, and the first controller is connected with the first detection circuit and the control end of the electronic switch, respectively.

2. The radio frequency receive switch circuit of claim 1, wherein, When it is determined that the impedance of the filter deviates from the target impedance according to the circuit parameter, the first controller controls the electronic switch to be turned on so that the compensation resistor compensates the impedance of the filter.

3. The radio frequency receive switch circuit of claim 2, wherein, The compensation resistor is specifically a potentiometer. The radio frequency receiving switch circuit further comprises a second detection circuit and a second controller.

4. The radio frequency receive switch circuit of claim 1, wherein, The second detection circuit is used for detecting a circuit parameter of the filter, and the second controller is connected with the second detection circuit and the control end of the potentiometer, respectively.

5. The radio frequency receive switch circuit of claim 1, wherein, When it is determined that the impedance of the filter deviates from the target impedance according to the circuit parameter, the second controller adjusts the resistance value of the potentiometer so that the potentiometer compensates the impedance of the filter to the target impedance.

6. A radio frequency front-end chip, comprising: The target impedance is specifically 50Ω. The compensation circuit is specifically arranged on a packaging board. The radio frequency receiving switch circuit comprises the radio frequency receiving switch circuit according to any one of claims 1 to 5.

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