Gain-adjustable low-noise amplifier and RF chip

Abstract

The present invention relates to the field of wireless communication technology, and provides a gain-adjustable low-noise amplifier and radio frequency chip, including a common input switching module, a first amplifier module, a second amplifier module, a first output matching module, a second output matching module, a first control module and a second control module; the input end of the common input switching module is used to receive a radio frequency signal, and the output end of the common input switching module is used to switch the radio frequency signal to the first amplifier module or the second amplifier module according to the first control module or the second control module; the first amplifier module and the second amplifier module respectively amplify the radio frequency signal, and output it through the first output matching module and the second output matching module respectively; the first control module is used to control the on-off of the first amplifier module to the ground, and the second control module is used to control the on-off of the second amplifier module to the ground. The present invention can achieve good isolation and performance indicators between input ports.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a gain-adjustable low-noise amplifier and a radio frequency chip. Background Art

[0002] With the update and iteration of electronic devices, their performance is constantly improving. In 4G and 5G networks, data transmission is completed through carrier channels. In the 5G era, due to the increase in spectrum resources and more advanced technologies, carrier aggregation (CA) has become one of the key technologies to achieve high-speed data transmission. Through carrier aggregation, operators can make full use of spectrum resources to provide higher data transmission rates and more stable network connections. The RF low noise amplifier (LNA), as the first-level active device of the RF front-end system, provides a channel for carrier aggregation. In order to meet the CA combination requirements between LNAs, there will be multiple LNAs that need to meet the same channel input. When CA combination is not performed, the input and output isolation between different LNAs must be guaranteed.

[0003] At present, in the design of multi-LNA with carrier aggregation CA function, in addition to the independent combination between each LNA, there is also a situation where the common port between multiple LNAs acts as a supplementary input to complete the CA combination. In terms of design, direct input switching may lead to input matching and sacrifices in gain and noise coefficient, which brings certain problems to the consistency of performance between ports, and this noise sacrifice cannot be perfected, resulting in poor RF performance indicators. Summary of the invention

[0004] In view of the above deficiencies in the prior art, the present invention proposes a gain-adjustable low-noise amplifier and a radio frequency chip to solve the problems of the existing gain-adjustable low-noise amplifier, such as the troublesome input port switching, poor gain and poor performance.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a gain-adjustable low-noise amplifier, comprising a common input switching module, a first amplifier module, a second amplifier module, a first output matching module, a second output matching module, a first control module, and a second control module;

[0007] The input end of the common input switching module is used to receive a radio frequency signal, and the output end of the common input switching module is used to switch the radio frequency signal to the first amplifier module or the second amplifier module according to the control signal sent by the first control module or the second control module; the first amplifier module and the second amplifier module respectively amplify the radio frequency signal and output it through the first output matching module and the second output matching module respectively;

[0008] The first control module is used to control the on-off of the first amplifier module to the ground, and the second control module is used to control the on-off of the second amplifier module to the ground;

[0009] The common input switching module includes a first capacitor, a second capacitor, a first inductor, a first resistor, a first MOS tube and a switch;

[0010] The first end of the first capacitor is used to receive the radio frequency signal, the second end of the first capacitor is respectively connected to the first end of the first resistor, the first end of the second capacitor and the gate of the first MOS tube, the second end of the second capacitor is respectively connected to the source of the first MOS tube and the first end of the first inductor, and the second end of the first inductor is grounded; the second end of the first resistor is respectively connected to the first amplifier module and the second amplifier module; the drain of the first MOS tube is connected to the control end of the switch, and the output end of the switch is connected to the input end of the first amplifier module or the input end of the second amplifier module.

[0011] Preferably, the first amplifier module includes a first amplifier circuit and a first bias circuit; the first amplifier circuit is used to amplify the radio frequency signal and output it to the first output matching module; the first bias circuit is used to provide a bias voltage for the first amplifier circuit; the first amplifier circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second resistor, a third resistor, a fourth resistor, a second inductor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor;

[0012] The first end of the third capacitor is used to receive the first radio frequency signal, and the second end of the third capacitor is respectively connected to the first end of the second resistor, the first end of the fourth capacitor and the gate of the second MOS tube; the second end of the second resistor is respectively connected to the first end of the first bias circuit, the first end of the third resistor and the second end of the first resistor; the second end of the first bias circuit is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the gate of the fourth MOS tube, the source of the fourth MOS tube is connected to the drain of the third MOS tube, and the drain of the fourth MOS tube serves as the output end of the first amplifier circuit;

[0013] The second end of the fourth capacitor is respectively connected to the source of the second MOS tube, the first end of the second inductor, the first end of the sixth capacitor and the source of the third MOS tube, and the second end of the second inductor is grounded; the second end of the third resistor is respectively connected to the first end of the fifth capacitor, the second end of the sixth capacitor and the gate of the third MOS tube; the second end of the fifth capacitor is used to receive the second RF signal.

[0014] Preferably, the first inductor and the second inductor are both adjustable inductors; and the fourth capacitor and the sixth capacitor are both adjustable capacitors.

[0015] Preferably, the second amplifier module includes a second amplifier circuit and a second bias circuit; the second amplifier circuit is used to amplify the radio frequency signal and output it to the second output matching module; the second bias circuit is used to provide a bias voltage for the second amplifier circuit; the second amplifier circuit includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a third inductor, a fifth MOS transistor, a sixth MOS transistor and a seventh MOS transistor;

[0016] The first end of the seventh capacitor is used to receive the third radio frequency signal, and the second end of the seventh capacitor is respectively connected to the first end of the fifth resistor, the first end of the eighth capacitor and the gate of the fifth MOS tube; the second end of the fifth resistor is connected to the first end of the second bias circuit; the second end of the second bias circuit is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the gate of the seventh MOS tube, the source of the seventh MOS tube is connected to the drain of the sixth MOS tube, and the drain of the seventh MOS tube serves as the output end of the second amplifier circuit;

[0017] The second end of the eighth capacitor is respectively connected to the source of the fifth MOS tube, the first end of the third inductor, the first end of the tenth capacitor and the source of the sixth MOS tube, and the second end of the third inductor is grounded; the first end of the sixth resistor is connected to the second end of the first resistor, and the second end of the sixth resistor is respectively connected to the first end of the ninth capacitor, the second end of the tenth capacitor and the gate of the sixth MOS tube; the second end of the ninth capacitor is used to receive a fourth RF signal.

[0018] Preferably, the third inductor is an adjustable inductor; and the eighth capacitor and the tenth capacitor are both adjustable capacitors.

[0019] Preferably, the first output matching module includes a first output matching circuit and a fourth inductor; the first end of the fourth inductor is connected to the input end of the first output matching circuit and serves as the input end of the first output matching module, the second end of the fourth inductor is used to connect to a power supply, and the output end of the first output matching circuit is used to output to a load.

[0020] Preferably, the second output matching module includes a second output matching circuit and a fifth inductor; the first end of the fifth inductor is connected to the input end of the second output matching circuit and serves as the input end of the second output matching module, the second end of the fifth inductor is used to connect to the power supply, and the output end of the second output matching circuit is used to output to the load.

[0021] In a second aspect, an embodiment of the present invention provides a radio frequency chip, comprising a gain-adjustable low-noise amplifier as described above.

[0022] Compared with the related art, in the embodiment of the present invention, the input end of the common input switching module is used to receive the radio frequency signal, and the output end of the common input switching module is used to switch the radio frequency signal to the first amplifier module or the second amplifier module according to the control signal sent by the first control module or the second control module; the first end of the first capacitor of the common input switching module is used to receive the radio frequency signal, the second end of the first capacitor is respectively connected to the first end of the first resistor, the first end of the second capacitor and the gate of the first MOS tube, the second end of the second capacitor is respectively connected to the source of the first MOS tube and the first end of the first inductor, and the second end of the first inductor is grounded; the second end of the first resistor is respectively connected to the first amplifier module and the second amplifier module; the drain of the first MOS tube is connected to the control end of the switch, and the output end of the switch is connected to the input end of the first amplifier module or the input end of the second amplifier module; the corresponding amplifier is switched and controlled by the switch, so that the full utilization of the spectrum of the radio frequency low noise amplifier LNA in the CA situation and the non-CA situation is met, and good isolation between the input ports is achieved. When the amplifier tube size and the source degeneration inductance of the common port are independently designed, the performance of the port can be fully adjusted so that both the input port of the low noise amplifier LNA itself and the radio frequency performance of the common port can meet the performance indicators of the operator in different application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0024] Figure 1 A circuit diagram of a gain-adjustable low-noise amplifier provided in an embodiment of the present invention.

[0025] Among them, 100, a gain-adjustable low-noise amplifier, 1, a common input switching module, 2, a first amplifier module, 21, a first amplifier circuit, 22, a first bias circuit, 3, a second amplifier module, 31, a second amplifier circuit, 32, a second bias circuit, 4, a first output matching module, 41, a first output matching circuit, 5, a second output matching module, 51, a second output matching circuit, 6, a first control module, and 7, a second control module. DETAILED DESCRIPTION

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] See also Figure 1 As shown, an embodiment of the present invention provides a gain-adjustable low-noise amplifier 100, including a common input switching module 1, a first amplifier module 2, a second amplifier module 3, a first output matching module 4, a second output matching module 5, a first control module 6 and a second control module 7.

[0031] The input end of the common input switching module 1 is used to receive a radio frequency signal, and the output end of the common input switching module 1 is used to switch the radio frequency signal to the first amplifier module 2 or the second amplifier module 3 according to the control signals sent by the first control module and the second control module; the first amplifier module 2 is connected to the second amplifier module 3, and the first amplifier module 2 and the second amplifier module 3 respectively amplify the radio frequency signal and output it through the first output matching module 4 and the second output matching module 5 respectively; the first control module 6 is used to control the on-off of the first amplifier module 2 to the ground, and the second control module 7 is used to control the on-off of the second amplifier module 3 to the ground. The common input switching module 1 is switched to the corresponding first amplifier module 2 and the second amplifier module 3 through the first control module 6 and the second control module 7. The signal is amplified through the first amplifier module 2 and the second amplifier module 3 respectively, and the output load is matched through the first output matching module 4 and the second output matching module 5.

[0032] Specifically, the common input switching module 1 includes a first capacitor CM1, a second capacitor CGSM, a first inductor LSM, a first resistor R1, a first MOS tube M1 and a switch SPDT; the first end of the first capacitor CM1 is used to receive the RF signal, the second end of the first capacitor CM1 is respectively connected to the first end of the first resistor R1, the first end of the second capacitor CGSM and the gate of the first MOS tube M1, the second end of the second capacitor CGSM is respectively connected to the source of the first MOS tube M1 and the first end of the first inductor LSM, and the second end of the first inductor LSM is grounded; the second end of the first resistor R1 is respectively connected to the first amplifier module 2 and the second amplifier module 3; the drain of the first MOS tube M1 is connected to the control end of the switch SPDT, and the first output end of the switch SPDT is connected to the input end of the first amplifier module 2 or the input end of the second amplifier module 3. By connecting the switch SPDT to the first amplifier module 2 and the second amplifier module 3, the first control module 6 is used to control the first amplifier module 2 to be turned on and off to the ground, and the second control module 7 is used to control the second amplifier module 3 to be turned on and off to the ground. When the CA mode needs to select the common input switching module 1 as the input port, turning on its unique first inductor LSM can have better RF performance, and the first control module 6 and the second control module 7 can be designed to solve the isolation problem caused by the common port of the low-noise amplifier 100 with different adjustable gains, and the selection logic of controlling the variable first inductor LSM can have good adjustment for the linearity and gain (Gain) of different gain gears and input matching.

[0033] Optionally, the amplifier module of the present invention is not only the first amplifier module 2 and the second amplifier module 3 , but may be multiple, and the connection mode of the first amplifier module 2 and the second amplifier module 3 is the same, and they all share a common input switching module 1 .

[0034] In this embodiment, the first amplifier module 2 includes a first amplifier circuit 21 and a first bias circuit 22; the first amplifier circuit 21 is used to amplify the RF signal and output it to the first output matching module 4; the first bias circuit 22 is used to provide a bias voltage for the first amplifier circuit 21.

[0035] In this embodiment, the first amplifier circuit 21 includes a third capacitor C11, a fourth capacitor CGS1, a fifth capacitor C12, a sixth capacitor CGS2, a second resistor R2, a third resistor R3, a fourth resistor R4, a second inductor LS1, a second MOS transistor M2, a third MOS transistor M3 and a fourth MOS transistor M4.

[0036] The first end of the third capacitor C11 is used to connect the first RF signal LNA1 IN1 The second end of the third capacitor C11 is respectively connected to the first end of the second resistor R2, the first end of the fourth capacitor CGS1 and the gate of the second MOS tube M2; the second end of the second resistor R2 is respectively connected to the first end of the first bias circuit 22, the first end of the third resistor R3 and the second end of the first resistor R1; the second end of the first bias circuit 22 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the gate of the fourth MOS tube M4, the source of the fourth MOS tube M4 is connected to the drain of the third MOS tube M3, and the drain of the fourth MOS tube M4 serves as the output end of the first amplifier circuit 21.

[0037] The second end of the fourth capacitor CGS1 is respectively connected to the source of the second MOS transistor M2, the first end of the second inductor LS1, the first end of the sixth capacitor CGS2 and the source of the third MOS transistor M3, and the second end of the second inductor LS1 is grounded; the second end of the third resistor R3 is respectively connected to the first end of the fifth capacitor C12, the second end of the sixth capacitor CGS2 and the gate of the third MOS transistor M3; the second end of the fifth capacitor C12 is used to connect the second RF signal LNA1 IN2 .

[0038] Specifically, the third MOS tube M3 and the fourth MOS tube M4 are used together to form a common source and common gate LNA architecture. The second resistor R2 and the third resistor R3 are connected through the first bias circuit 22 to provide voltage division power to the second MOS tube M2 and the third MOS tube M3 respectively. The fourth resistor R4 is used to power the fourth MOS tube M4, and the third capacitor C11 and the fifth capacitor C12 are used to respectively connect the first RF signal LNA1 to the first RF signal LNA2. IN1 and the second RF signal LNA1 IN2 The fourth capacitor CGS1 and the sixth capacitor CGS2 are respectively used to isolate the input DC signal of the first RF signal LNA1. IN1 and the second RF signal LNA1 IN2 The second inductor LS1 is used to adjust the input impedance and linearity of the source electrodes of the second MOS tube M2 and the third MOS tube M3.

[0039] In this embodiment, the first inductor LSM and the second inductor LS1 are both adjustable inductors; the fourth capacitor CGS1 and the sixth capacitor CGS2 are both adjustable capacitors.

[0040] In this embodiment, the second amplifier module 3 includes a second amplifier circuit 31 and a second bias circuit 32; the second amplifier circuit 31 is used to amplify the RF signal and output it to the second output matching module 5; the second bias circuit 32 is used to provide a bias voltage for the second amplifier circuit 31.

[0041] In this embodiment, the second amplifier circuit 31 includes a seventh capacitor C21, an eighth capacitor CGS3, a ninth capacitor C22, a tenth capacitor CGS4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third inductor LS2, a fifth MOS transistor M5, a sixth MOS transistor M6 and a seventh MOS transistor M7.

[0042] The first end of the seventh capacitor C21 is used to connect the third RF signal LNA2 IN1 The second end of the seventh capacitor C21 is respectively connected to the first end of the fifth resistor R5, the first end of the eighth capacitor CGS3 and the gate of the fifth MOS tube M5; the second end of the fifth resistor R5 is connected to the first end of the second bias circuit 32; the second end of the second bias circuit 32 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the gate of the seventh MOS tube M7, the source of the seventh MOS tube M7 is connected to the drain of the sixth MOS tube M6, and the drain of the seventh MOS tube M7 serves as the output end of the second amplifier circuit 31.

[0043] The second end of the eighth capacitor CGS3 is respectively connected to the source of the fifth MOS transistor M5, the first end of the third inductor LS2, the first end of the tenth capacitor CGS4 and the source of the sixth MOS transistor M6, and the second end of the third inductor LS2 is grounded; the first end of the sixth resistor R6 is connected to the second end of the first resistor R1, and the second end of the sixth resistor R6 is respectively connected to the first end of the ninth capacitor C22, the second end of the tenth capacitor CGS4 and the gate of the sixth MOS transistor M6; the second end of the ninth capacitor C22 is used to receive the fourth RF signal LNA2 IN2 .

[0044] Specifically, the sixth MOS tube M6 and the seventh MOS tube M7 are used together to form a common source and common gate LNA architecture. The fifth resistor R5 and the sixth resistor R6 are connected through the second bias circuit 32 to provide voltage division power to the fifth MOS tube M5 and the sixth MOS tube M6 respectively. The seventh resistor R7 is used to power the seventh MOS tube M7, and the seventh capacitor C21 and the ninth capacitor C22 are used to respectively provide the third RF signal LNA2 IN1 and the fourth RF signal LNA2 IN2 The eighth capacitor CGS3 and the tenth capacitor CGS4 are respectively used to isolate the input DC signal of the third RF signal LNA2. IN1 and the fourth RF signal LNA2 IN2 The third inductor LS2 is used to adjust the input impedance and linearity of the source electrodes of the fifth MOS tube M5 and the sixth MOS tube M6.

[0045] In this embodiment, the third inductor LS2 is an adjustable inductor; the eighth capacitor CGS3 and the tenth capacitor CGS4 are both adjustable capacitors.

[0046] In this embodiment, the first output matching module 4 includes a first output matching circuit 41 and a fourth inductor L01; the first end of the fourth inductor L01 is connected to the input end of the first output matching circuit 41 and serves as the input end of the first output matching module 4, the second end of the fourth inductor L01 is used to connect to the power supply VDD, and the output end of the first output matching circuit 41 is used to output to the load. The first output matching circuit 41 is connected to the fourth inductor L01 to adjust the output matching of the first amplifier circuit 21.

[0047] In this embodiment, the second output matching module 5 includes a second output matching circuit 51 and a fifth inductor L02; a first end of the fifth inductor L02 is connected to an input end of the second output matching circuit 51 and serves as an input end of the second output matching module 5, a second end of the fifth inductor L02 is used to connect to a power supply VDD, and an output end of the second output matching circuit 51 is used to output to a load. The second output matching circuit 51 is connected to the fifth inductor L02 to adjust the output matching of the second amplifier circuit 31.

[0048] Embodiment 2

[0049] The embodiment of the present invention provides a radio frequency chip, including the above-mentioned gain-adjustable low noise amplifier 100. The technical effect produced by the radio frequency chip is the same as that of the above-mentioned gain-adjustable low noise amplifier 100, which will not be described here.

[0050] It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent substitution of the present invention without departing from the spirit and scope of the present invention should be included within the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. A gain-adjustable low-noise amplifier, characterized in that: It includes a common input switching module, a first amplifier module, a second amplifier module, a first output matching module, a second output matching module, a first control module and a second control module; The input end of the common input switching module is used to receive a radio frequency signal, and the output end of the common input switching module is used to switch the radio frequency signal to the first amplifier module or the second amplifier module according to the control signal sent by the first control module or the second control module; the first amplifier module and the second amplifier module respectively amplify the radio frequency signal and output it through the first output matching module and the second output matching module respectively; The first control module is used to control the on-off of the first amplifier module to the ground, and the second control module is used to control the on-off of the second amplifier module to the ground; The common input switching module includes a first capacitor, a second capacitor, a first inductor, a first resistor, a first MOS tube and a switch; The first end of the first capacitor is used to receive the radio frequency signal, the second end of the first capacitor is respectively connected to the first end of the first resistor, the first end of the second capacitor and the gate of the first MOS tube, the second end of the second capacitor is respectively connected to the source of the first MOS tube and the first end of the first inductor, and the second end of the first inductor is grounded; the second end of the first resistor is respectively connected to the first amplifier module and the second amplifier module; the drain of the first MOS tube is connected to the control end of the switch, and the output end of the switch is connected to the input end of the first amplifier module or the input end of the second amplifier module; The first amplifier module includes a first amplifier circuit and a first bias circuit; the first amplifier circuit is used to amplify the radio frequency signal and output it to the first output matching module; The first bias circuit is used to provide a bias voltage for the first amplifier circuit; the first amplifier circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second resistor, a third resistor, a fourth resistor, a second inductor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor; The first end of the third capacitor is used to receive the first RF signal, and the second end of the third capacitor is respectively connected to the first end of the second resistor, the first end of the fourth capacitor and the gate of the second MOS tube; the second end of the second resistor is respectively connected to the first end of the first bias circuit, the first end of the third resistor and the second end of the first resistor; The second end of the first bias circuit is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the gate of the fourth MOS transistor, the source of the fourth MOS transistor is connected to the drain of the third MOS transistor, and the drain of the fourth MOS transistor serves as the output end of the first amplifier circuit; The second end of the fourth capacitor is respectively connected to the source of the second MOS transistor, the first end of the second inductor, the first end of the sixth capacitor and the source of the third MOS transistor, and the second end of the second inductor is grounded; the second end of the third resistor is respectively connected to the first end of the fifth capacitor, the second end of the sixth capacitor and the gate of the third MOS transistor; the second end of the fifth capacitor is used to receive the second RF signal; The second amplifier module includes a second amplifier circuit and a second bias circuit; the second amplifier circuit is used to amplify the radio frequency signal and output it to the second output matching module; The second bias circuit is used to provide a bias voltage for the second amplifier circuit; the second amplifier circuit includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a third inductor, a fifth MOS transistor, a sixth MOS transistor and a seventh MOS transistor; The first end of the seventh capacitor is used to receive the third radio frequency signal, and the second end of the seventh capacitor is respectively connected to the first end of the fifth resistor, the first end of the eighth capacitor and the gate of the fifth MOS tube; the second end of the fifth resistor is connected to the first end of the second bias circuit; the second end of the second bias circuit is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the gate of the seventh MOS tube, the source of the seventh MOS tube is connected to the drain of the sixth MOS tube, and the drain of the seventh MOS tube serves as the output end of the second amplifier circuit; The second end of the eighth capacitor is respectively connected to the source of the fifth MOS tube, the first end of the third inductor, the first end of the tenth capacitor and the source of the sixth MOS tube, and the second end of the third inductor is grounded; the first end of the sixth resistor is connected to the second end of the first resistor, and the second end of the sixth resistor is respectively connected to the first end of the ninth capacitor, the second end of the tenth capacitor and the gate of the sixth MOS tube; the second end of the ninth capacitor is used to receive a fourth RF signal.

2. The gain-adjustable low-noise amplifier according to claim 1, characterized in that: The first inductor and the second inductor are both adjustable inductors; the fourth capacitor and the sixth capacitor are both adjustable capacitors.

3. The gain-adjustable low-noise amplifier according to claim 1, characterized in that: The third inductor is an adjustable inductor; the eighth capacitor and the tenth capacitor are both adjustable capacitors.

4. The gain-adjustable low-noise amplifier according to claim 1, characterized in that: The first output matching module includes a first output matching circuit and a fourth inductor; a first end of the fourth inductor is connected to an input end of the first output matching circuit and serves as an input end of the first output matching module, a second end of the fourth inductor is used to connect to a power supply, and an output end of the first output matching circuit is used to output to a load.

5. The gain-adjustable low-noise amplifier according to claim 1, characterized in that: The second output matching module includes a second output matching circuit and a fifth inductor; a first end of the fifth inductor is connected to an input end of the second output matching circuit and serves as an input end of the second output matching module, a second end of the fifth inductor is used to connect to a power supply, and an output end of the second output matching circuit is used to output to a load.

6. A radio frequency chip, characterized in that: It comprises a gain-adjustable low-noise amplifier as described in any one of claims 1 to 5.

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