Adjustable bidirectional amplifier

Abstract

The invention discloses an adjustable bidirectional amplifier. A first composite radio frequency port RF1, a first single-pole double-throw switch circuit, a second single-pole single-throw switch circuit, a first single-pole single-throw switch circuit, a third single-pole single-throw switch circuit, a first receiving external port RF5, a second receiving external port RF6, a second composite radio frequency port RF2 of the adjustable bidirectional amplifier form a receiving link; a second composite radio frequency port RF2, a second single-pole double-throw switch circuit, a first transmitting external port RF3, a second transmitting external port RF4, a power amplifier circuit, a first single-pole double-throw switch circuit and a first composite radio frequency port RF1 of the adjustable bidirectional amplifier form a transmitting link. When the adjustable bidirectional amplifier is used, the gain of a transmitting link and the gain of a receiving link can be set according to the needs of a user, and the isolation degree is good.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency communications, and in particular to an adjustable bidirectional amplifier. Background Art

[0002] Existing phased array systems involve two independent links: the transmit link and the receive link. The transmit link involves multiple cascaded power amplifiers, and the receive link involves multiple cascaded low-noise amplifiers. The transmit and receive links require external transmit and receive switches, which increases the complexity of the system link design and significantly increases the size of the equipment. Bidirectional amplifiers that integrate switches and amplifiers can effectively solve this problem.

[0003] However, existing bidirectional amplifiers have fixed amplification performance for both the transmit and receive links, which is not user-friendly. First, this may result in excessive gain, causing system instability. Second, there are many limitations on their use. If a bidirectional amplifier at a certain level only needs to amplify transmit and not receive, a receive bypass circuit must be added to the system. This bypass circuit not only needs to consider the switching between transmit and receive, but also the isolation between the transmit and receive links, making it relatively complex to implement outside the chip.

[0004] In view of the existence of the above problems, it is necessary to study an adjustable bidirectional amplifier, which can set the gain of the transmitting link and the receiving link according to user needs when in use, and has good isolation. Summary of the Invention

[0005] The object of the present invention is to provide an adjustable bidirectional amplifier, which can set the gains of a transmitting link and a receiving link according to user needs when in use and has good isolation.

[0006] In order to achieve the above object, the solution of the present invention is: An adjustable bidirectional amplifier includes a first composite radio frequency port RF1, a second composite radio frequency port RF2, a first transmitting external port RF3, a second transmitting external port RF4, a first receiving external port RF5, a second receiving external port RF6, a first single-pole double-throw switch circuit, a second single-pole double-throw switch circuit, a first single-pole single-throw switch circuit, a second single-pole single-throw switch circuit, a third single-pole single-throw switch circuit, and a power amplifier circuit; the first composite radio frequency port RF1 is connected to the moving end of the first single-pole double-throw switch circuit, the first fixed end of the first single-pole double-throw switch circuit is connected to the output end of the power amplifier circuit, and the input end of the power amplifier circuit is connected to the second transmitting external port RF4, the second fixed end of the first single-pole single-throw switch circuit is connected to the first conductive end of the first single-pole single-throw switch circuit and the first conductive end of the second single-pole single-throw switch circuit, the second conductive end of the first single-pole single-throw switch circuit and the first conductive end of the third single-pole single-throw switch circuit are connected to the first receiving external port RF5, the second conductive end of the second single-pole single-throw switch circuit and the second conductive end of the third single-pole single-throw switch circuit are grounded, the second composite RF port RF2 is connected to the moving end of the second single-pole double-throw switch circuit, the first fixed end of the second single-pole double-throw switch circuit is connected to the first transmitting external port RF3, and the second fixed end of the second single-pole double-throw switch circuit is connected to the second receiving external port RF6.

[0007] The input end of the power amplifier circuit is connected to the second transmitting external port RF4 through a first impedance matching network, the first fixed end of the second single-pole double-throw switch circuit is connected to the first transmitting external port RF3 through a second impedance matching network, the second conducting end of the first single-pole single-throw switch circuit and the first conducting end of the third single-pole single-throw switch circuit are connected to the first receiving external port RF5 through a third impedance matching network, and the second fixed end of the second single-pole double-throw switch circuit is connected to the second receiving external port RF6 through a fourth impedance matching network.

[0008] The impedance of the first transmitting external port RF3 is 50 ohms, the impedance of the second transmitting external port RF4 is 50 ohms, the impedance of the first receiving external port RF5 is 50 ohms, and the impedance of the second receiving external port RF6 is 50 ohms.

[0009] The first impedance matching network includes an inductor L11, an inductor L12, a capacitor C11 and a capacitor C12, the first end of the capacitor C11 is connected to the input end of the power amplifier circuit, the second end of the capacitor C11 is connected to the first end of the inductor L11, the second end of the inductor L11 is connected to the first end of the inductor L12 and the first end of the capacitor C12, the second end of the capacitor C12 is grounded, and the second end of the inductor L12 is connected to the second transmitting external port RF4; the second impedance matching network includes an inductor L21, an inductor L22 and a capacitor C21, the first end of the capacitor C21 is connected to the first fixed end of the second single-pole double-throw switch circuit, the second end of the capacitor C21 is connected to the first end of the inductor L21 and the first end of the inductor L22, the second end of the inductor L22 is grounded, and the second end of the inductor L21 is connected to the first transmitting external port RF3.

[0010] The third impedance matching network includes an inductor L31, an inductor L32 and a capacitor C31, wherein the first end of the inductor L31 is connected to the second conduction end of the first single-pole single-throw switch circuit and the first conduction end of the third single-pole single-throw switch circuit, the second end of the inductor L31 is connected to the first end of the inductor L32 and the first end of the capacitor C31, the second end of the capacitor C31 is grounded, and the second end of the inductor L32 is connected to the first external receiving port RF5; the fourth impedance matching network includes an inductor L41, an inductor L42 and a capacitor C41, the first end of the inductor L41 is connected to the second external receiving port RF6, the second end of the inductor L41 is connected to the first end of the inductor L42 and the first end of the capacitor C41, the second end of the capacitor C41 is grounded, and the second end of the inductor L42 is connected to the second fixed end of the second single-pole double-throw switch circuit.

[0011] The first single-pole double-throw switch circuit includes a MOS transistor M1, a MOS transistor M2, a MOS transistor M3, and a MOS transistor M4. The drain of the MOS transistor M1 and the drain of the MOS transistor M3 are connected to the moving end of the first single-pole double-throw switch circuit, the source of the MOS transistor M1 and the drain of the MOS transistor M2 are connected to the first fixed end of the first single-pole double-throw switch, the source of the MOS transistor M3 and the drain of the MOS transistor M4 are connected to the first fixed end of the first single-pole double-throw switch, the source of the MOS transistor M2 and the source of the MOS transistor M4 are grounded, the gates of the MOS transistor M1 and the gates of the MOS transistor M4 are connected to the first control signal V1, and the gates of the MOS transistor M2 and the gates of the MOS transistor M4 are connected to the second control signal V2.

[0012] The second single-pole double-throw switch circuit includes a MOS transistor M8, a MOS transistor M9, a MOS transistor M10, and a MOS transistor M11. The drain of the MOS transistor M8 and the drain of the MOS transistor M10 are connected to the moving end of the second single-pole double-throw switch circuit, the source of the MOS transistor M8 and the drain of the MOS transistor M9 are connected to the first fixed end of the second single-pole double-throw switch, the source of the MOS transistor M10 and the drain of the MOS transistor M11 are connected to the first fixed end of the second single-pole double-throw switch, the source of the MOS transistor M9 and the source of the MOS transistor M11 are grounded, the gates of the MOS transistor M8 and the gates of the MOS transistor M11 are connected to the first control signal V1, and the gates of the MOS transistor M9 and the gates of the MOS transistor M11 are connected to the second control signal V2.

[0013] The first single-pole single-throw switch circuit includes a MOS transistor M6 , a drain and a source of the MOS transistor M6 are respectively connected to a first conduction terminal and a second conduction terminal of the first single-pole single-throw switch circuit, and a gate of the MOS transistor M6 is connected to a second control signal V2 .

[0014] The second single-pole single-throw switch circuit includes a MOS transistor M5 , a drain and a source of the MOS transistor M5 are respectively connected to the first conduction terminal and the second conduction terminal of the second single-pole single-throw switch circuit, and a gate of the MOS transistor M5 is connected to the first control signal V1 .

[0015] The third single-pole single-throw switch circuit includes a MOS transistor M7 , a drain and a source of the MOS transistor M7 are respectively connected to the first conduction terminal and the second conduction terminal of the third single-pole single-throw switch circuit, and a gate of the MOS transistor M7 is connected to the first control signal V1 .

[0016] After adopting the above scheme, the present invention has the following characteristics: 1. The adjustable bidirectional amplifier of the present invention has the ability to both transmit and receive radio frequency signals; wherein, the branch including the first composite radio frequency port RF1, the first single-pole double-throw switch circuit, the second single-pole single-throw switch circuit, the first single-pole single-throw switch circuit, the third single-pole single-throw switch circuit, the first receiving external port RF5, the second receiving external port RF6 to the second composite radio frequency port RF2 is the receiving link; and the branch including the second composite radio frequency port RF2, the second single-pole double-throw switch circuit, the first transmitting external port RF3, the second transmitting external port RF4, the power amplifier circuit, the first single-pole double-throw switch circuit to the first composite radio frequency port RF1 is the transmitting link. Among them, when in use, the user can connect the first transmit external port RF3 and the second transmit external port RF4 to different devices (such as microstrip lines, power amplifiers, attenuators) to adjust the gain of the transmit link, and can also connect the first receive external port RF5 and the second receive external port RF6 to different devices (such as microstrip lines, low-noise amplifiers, attenuators) to adjust the gain of the receive link. As can be seen, the adjustable bidirectional amplifier of the present invention can set the gain of the transmit link and the receive link according to user needs when in use, making it more flexible to use; 2. When the adjustable bidirectional amplifier of the present invention is in a transmitting state, the first and second single-pole double-throw switch circuits are in a transmitting state (i.e., the moving terminal of the first single-pole double-throw switch circuit is conductively connected to its first fixed terminal, and the moving terminal of the second single-pole double-throw switch circuit is conductively connected to its first fixed terminal). At this time, the second single-pole single-throw switch circuit is disconnected, and the first and third single-pole single-throw switch circuits are conductively connected, thereby improving the isolation between the transmitting link and the receiving link. When the adjustable bidirectional amplifier of the present invention is in a receiving state, the first and second single-pole double-throw switch circuits are in a receiving state (i.e., the moving terminal of the first single-pole double-throw switch circuit is conductively connected to its second fixed terminal, and the moving terminal of the second single-pole double-throw switch circuit is conductively connected to its second fixed terminal). At this time, the second single-pole single-throw switch circuit is conductively connected, and the first and third single-pole single-throw switch circuits are disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle block diagram of the present invention.

[0018] Figure 2 Schematic diagram of the circuit of the present invention. DETAILED DESCRIPTION

[0019] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0020] like Figure 1 and Figure 2As shown, the present invention discloses an adjustable bidirectional amplifier, which includes a first composite radio frequency port RF1, a second composite radio frequency port RF2, a first transmitting external port RF3, a second transmitting external port RF4, a first receiving external port RF5, a second receiving external port RF6, a first single-pole double-throw switch circuit, a second single-pole double-throw switch circuit, a first single-pole single-throw switch circuit, a second single-pole single-throw switch circuit, a third single-pole single-throw switch circuit and a power amplifier circuit; the first composite radio frequency port RF1 is connected to the moving end of the first single-pole double-throw switch circuit, the first fixed end of the first single-pole double-throw switch circuit is connected to the output end of the power amplifier circuit, and the input end of the power amplifier circuit is connected to the second transmitting The transmitting external port RF4, the second fixed end of the first single-pole single-throw switch circuit is connected to the first conducting end of the first single-pole single-throw switch circuit and the first conducting end of the second single-pole single-throw switch circuit, the second conducting end of the first single-pole single-throw switch circuit and the first conducting end of the third single-pole single-throw switch circuit are connected to the first receiving external port RF5, the second conducting end of the second single-pole single-throw switch circuit and the second conducting end of the third single-pole single-throw switch circuit are grounded, the second composite RF port RF2 is connected to the moving end of the second single-pole double-throw switch circuit, the first fixed end of the second single-pole double-throw switch circuit is connected to the first transmitting external port RF3, and the second fixed end of the second single-pole double-throw switch circuit is connected to the second receiving external port RF6.

[0021] The adjustable bidirectional amplifier of the present invention has the ability to simultaneously transmit and receive radio frequency signals; wherein, the branch where the first composite radio frequency port RF1, the first single-pole double-throw switch circuit, the second single-pole single-throw switch circuit, the first single-pole single-throw switch circuit, the third single-pole single-throw switch circuit, the first receiving external port RF5, the second receiving external port RF6 to the second composite radio frequency port RF2 is a receiving link; and the branch where the second composite radio frequency port RF2, the second single-pole double-throw switch circuit, the first transmitting external port RF3, the second transmitting external port RF4, the power amplifier circuit, the first single-pole double-throw switch circuit to the first composite radio frequency port RF1 is a transmitting link. Among them, when in use, the user can connect the first transmitting external port RF3 and the second transmitting external port RF4 to different devices (such as microstrip lines, power amplifiers, attenuators) to adjust the gain of the transmitting link, and can also connect the first receiving external port RF5 and the second receiving external port RF6 to different devices (such as microstrip lines, low-noise amplifiers, attenuators) to adjust the gain of the receiving link. It can be seen that the adjustable bidirectional amplifier of the present invention can set the gains of the transmitting link and the receiving link according to user needs when in use, making it more flexible to use.

[0022] The adjustable bidirectional amplifier of the present invention works as follows: When the adjustable bidirectional amplifier of the present invention is in a transmitting state, the first single-pole double-throw switch circuit and the second single-pole double-throw switch circuit are in a transmitting state (i.e., the movable end of the first single-pole double-throw switch circuit is conductively connected to its first fixed end, and the movable end of the second single-pole double-throw switch circuit is conductively connected to its first fixed end). At this time, the second single-pole single-throw switch circuit is disconnected, and the first single-pole single-throw switch circuit and the third single-pole single-throw switch circuit are conductively connected, thereby improving the isolation between the transmitting link and the receiving link. When the adjustable bidirectional amplifier of the present invention is in a receiving state, the first single-pole double-throw switch circuit and the second single-pole double-throw switch circuit are in a receiving state (i.e., the moving end of the first single-pole double-throw switch circuit is conductively connected to its second fixed end, and the moving end of the second single-pole double-throw switch circuit is conductively connected to its second fixed end), and at this time, the second single-pole single-throw switch circuit is conductively connected, and the first single-pole single-throw switch circuit and the third single-pole single-throw switch circuit are disconnected.

[0023] In an embodiment of the present invention, the input end of the power amplifier circuit can be connected to the second transmitting external port RF4 via a first impedance matching network, the first fixed end of the second single-pole double-throw switch circuit can be connected to the first transmitting external port RF3 via a second impedance matching network, the second conducting end of the first single-pole single-throw switch circuit and the first conducting end of the third single-pole single-throw switch circuit can be connected to the first receiving external port RF5 via a third impedance matching network, and the second fixed end of the second single-pole double-throw switch circuit can be connected to the second receiving external port RF6 via a fourth impedance matching network. Such an arrangement enables the impedance of the first transmitting external port RF3 to be 50 ohms, the impedance of the second transmitting external port RF4 to be 50 ohms, the impedance of the first receiving external port RF5 to be 50 ohms, and the impedance of the second receiving external port RF6 to be 50 ohms. This facilitates impedance matching between the first transmitting external port RF3, the second transmitting external port RF4, the first receiving external port RF5, and the second receiving external port RF6 and external devices, thereby improving system stability and transmission efficiency.

[0024] In an embodiment of the present invention, the first impedance matching network may include an inductor L11, an inductor L12, a capacitor C11 and a capacitor C12, the first end of the capacitor C11 is connected to the input end of the power amplifier circuit, the second end of the capacitor C11 is connected to the first end of the inductor L11, the second end of the inductor L11 is connected to the first end of the inductor L12 and the first end of the capacitor C12, the second end of the capacitor C12 is grounded, and the second end of the inductor L12 is connected to the second transmitting external port RF4; the second impedance matching network may include an inductor L21, an inductor L22 and a capacitor C21, the first end of the capacitor C21 is connected to the first fixed end of the second single-pole double-throw switch circuit, the second end of the capacitor C21 is connected to the first end of the inductor L21 and the first end of the inductor L22, the second end of the inductor L22 is grounded, and the second end of the inductor L21 is connected to the first transmitting external port RF4. external port RF3; the third impedance matching network may include an inductor L31, an inductor L32 and a capacitor C31, the first end of the inductor L31 is connected to the second conduction end of the first single-pole single-throw switch circuit and the first conduction end of the third single-pole single-throw switch circuit, the second end of the inductor L31 is connected to the first end of the inductor L32 and the first end of the capacitor C31, the second end of the capacitor C31 is grounded, and the second end of the inductor L32 is connected to the first receiving external port RF5; the fourth impedance matching network may include an inductor L41, an inductor L42 and a capacitor C41, the first end of the inductor L41 is connected to the second receiving external port RF6, the second end of the inductor L41 is connected to the first end of the inductor L42 and the first end of the capacitor C41, the second end of the capacitor C41 is grounded, and the second end of the inductor L42 is connected to the second fixed end of the second single-pole double-throw switch circuit.

[0025] In an embodiment of the present invention, the first single-pole double-throw switch circuit may include a MOS transistor M1, a MOS transistor M2, a MOS transistor M3, and a MOS transistor M4. The drain of the MOS transistor M1 and the drain of the MOS transistor M3 are connected to the active terminal of the first single-pole double-throw switch circuit, the source of the MOS transistor M1 and the drain of the MOS transistor M2 are connected to the first fixed terminal of the first single-pole double-throw switch, the source of the MOS transistor M3 and the drain of the MOS transistor M4 are connected to the first fixed terminal of the first single-pole double-throw switch, the source of the MOS transistor M2 and the source of the MOS transistor M4 are grounded, the gates of the MOS transistor M1 and the gates of the MOS transistor M4 are connected to the first control signal V1, and the gates of the MOS transistor M2 and the gates of the MOS transistor M4 are connected to the second control signal V2. The MOS transistors M2 and M4 are provided to improve isolation.

[0026] In an embodiment of the present invention, the second single-pole double-throw switch circuit may include a MOS transistor M8, a MOS transistor M9, a MOS transistor M10, and a MOS transistor M11. The drain of the MOS transistor M8 and the drain of the MOS transistor M10 are connected to the active terminal of the second single-pole double-throw switch circuit, the source of the MOS transistor M8 and the drain of the MOS transistor M9 are connected to the first fixed terminal of the second single-pole double-throw switch, the source of the MOS transistor M10 and the drain of the MOS transistor M11 are connected to the first fixed terminal of the second single-pole double-throw switch, the source of the MOS transistor M9 and the source of the MOS transistor M11 are grounded, the gates of the MOS transistor M8 and the gates of the MOS transistor M11 are connected to the first control signal V1, and the gates of the MOS transistor M9 and the gates of the MOS transistor M11 are connected to the second control signal V2. The configuration of the MOS transistors M9 and M11 is also to improve isolation.

[0027] In an embodiment of the present invention, the first single-pole single-throw switch circuit may include a MOS transistor M6, the drain and source of the MOS transistor M6 are respectively connected to the first conductive end and the second conductive end of the first single-pole single-throw switch circuit, and the gate of the MOS transistor M6 is connected to the second control signal V2; the second single-pole single-throw switch circuit may include a MOS transistor M5, the drain and source of the MOS transistor M5 are respectively connected to the first conductive end and the second conductive end of the second single-pole single-throw switch circuit, and the gate of the MOS transistor M5 is connected to the first control signal V1; the third single-pole single-throw switch circuit may include a MOS transistor M7, the drain and source of the MOS transistor M7 are respectively connected to the first conductive end and the second conductive end of the third single-pole single-throw switch circuit, and the gate of the MOS transistor M7 is connected to the first control signal V1.

[0028] Based on the above, the present invention can comprehensively control the first single-pole double-throw switch circuit, the second single-pole double-throw switch circuit, the first single-pole single-throw switch circuit, the second single-pole single-throw switch circuit, and the third single-pole single-throw switch circuit through the first control signal V1 and the second control signal V2, thereby facilitating switching between the transmitting state and the receiving state. When the adjustable bidirectional amplifier of the present invention is in the receiving state, the first control signal V1 is -5V and the second control signal V2 is 0V. At this time, MOS transistors M1, M4, M8, and M11 are in the off state, while MOS transistors M2, M3, M9, and M10 are in the on state. When the adjustable bidirectional amplifier of the present invention is in the transmitting state, the first control signal V1 is 0V and the second control signal V2 is -5V. At this time, MOS transistors M1, M4, M8, and M11 are in the on state, while MOS transistors M2, M3, M9, and M10 are in the off state.

[0029] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. An adjustable bidirectional amplifier, characterized in that: It includes a first composite radio frequency port RF1, a second composite radio frequency port RF2, a first transmitting external port RF3, a second transmitting external port RF4, a first receiving external port RF5, a second receiving external port RF6, a first single-pole double-throw switch circuit, a second single-pole double-throw switch circuit, a first single-pole single-throw switch circuit, a second single-pole single-throw switch circuit, a third single-pole single-throw switch circuit and a power amplifier circuit; The first composite RF port RF1 is connected to the moving end of the first single-pole double-throw switch circuit, the first fixed end of the first single-pole double-throw switch circuit is connected to the output end of the power amplifier circuit, the input end of the power amplifier circuit is connected to the second transmitting external port RF4, the second fixed end of the first single-pole double-throw switch circuit is connected to the first conducting end of the first single-pole single-throw switch circuit and the first conducting end of the second single-pole single-throw switch circuit, the second conducting end of the first single-pole single-throw switch circuit and the first conducting end of the third single-pole single-throw switch circuit are connected to the first receiving external port RF5, the second conducting end of the second single-pole single-throw switch circuit and the second conducting end of the third single-pole single-throw switch circuit are grounded, the second composite RF port RF2 is connected to the moving end of the second single-pole double-throw switch circuit, the first fixed end of the second single-pole double-throw switch circuit is connected to the first transmitting external port RF3, and the second fixed end of the second single-pole double-throw switch circuit is connected to the second receiving external port RF6.

2. The adjustable bidirectional amplifier according to claim 1, wherein: The input end of the power amplifier circuit is connected to the second transmitting external port RF4 through a first impedance matching network, the first fixed end of the second single-pole double-throw switch circuit is connected to the first transmitting external port RF3 through a second impedance matching network, the second conducting end of the first single-pole single-throw switch circuit and the first conducting end of the third single-pole single-throw switch circuit are connected to the first receiving external port RF5 through a third impedance matching network, and the second fixed end of the second single-pole double-throw switch circuit is connected to the second receiving external port RF6 through a fourth impedance matching network.

3. The adjustable bidirectional amplifier according to claim 2, wherein: The impedance of the first transmitting external port RF3 is 50 ohms, the impedance of the second transmitting external port RF4 is 50 ohms, the impedance of the first receiving external port RF5 is 50 ohms, and the impedance of the second receiving external port RF6 is 50 ohms.

4. The adjustable bidirectional amplifier according to claim 2 or 3, wherein: The first impedance matching network includes an inductor L11, an inductor L12, a capacitor C11, and a capacitor C12, wherein a first end of the capacitor C11 is connected to an input end of the power amplifier circuit, a second end of the capacitor C11 is connected to a first end of the inductor L11, a second end of the inductor L11 is connected to a first end of the inductor L12 and a first end of the capacitor C12, a second end of the capacitor C12 is grounded, and a second end of the inductor L12 is connected to a second external transmitting port RF4; The second impedance matching network includes an inductor L21, an inductor L22 and a capacitor C21. The first end of the capacitor C21 is connected to the first fixed end of the second single-pole double-throw switch circuit, the second end of the capacitor C21 is connected to the first end of the inductor L21 and the first end of the inductor L22, the second end of the inductor L22 is grounded, and the second end of the inductor L21 is connected to the first transmitting external port RF3.

5. The adjustable bidirectional amplifier according to claim 2 or 3, wherein: The third impedance matching network includes an inductor L31, an inductor L32, and a capacitor C31, wherein a first end of the inductor L31 is connected to the second conduction end of the first single-pole single-throw switch circuit and the first conduction end of the third single-pole single-throw switch circuit, a second end of the inductor L31 is connected to the first end of the inductor L32 and the first end of the capacitor C31, a second end of the capacitor C31 is grounded, and a second end of the inductor L32 is connected to the first external receiving port RF5; The fourth impedance matching network includes an inductor L41, an inductor L42 and a capacitor C41. The first end of the inductor L41 is connected to the second external receiving port RF6, the second end of the inductor L41 is connected to the first end of the inductor L42 and the first end of the capacitor C41, the second end of the capacitor C41 is grounded, and the second end of the inductor L42 is connected to the second fixed end of the second single-pole double-throw switch circuit.

6. The adjustable bidirectional amplifier according to claim 1, wherein: The first single-pole double-throw switch circuit includes a MOS transistor M1, a MOS transistor M2, a MOS transistor M3, and a MOS transistor M4. The drain of the MOS transistor M1 and the drain of the MOS transistor M3 are connected to the moving end of the first single-pole double-throw switch circuit, the source of the MOS transistor M1 and the drain of the MOS transistor M2 are connected to the first fixed end of the first single-pole double-throw switch, the source of the MOS transistor M3 and the drain of the MOS transistor M4 are connected to the first fixed end of the first single-pole double-throw switch, the source of the MOS transistor M2 and the source of the MOS transistor M4 are grounded, the gates of the MOS transistor M1 and the gates of the MOS transistor M4 are connected to the first control signal V1, and the gates of the MOS transistor M2 and the gates of the MOS transistor M4 are connected to the second control signal V2.

7. The adjustable bidirectional amplifier according to claim 1, wherein: The second single-pole double-throw switch circuit includes a MOS transistor M8, a MOS transistor M9, a MOS transistor M10, and a MOS transistor M11. The drain of the MOS transistor M8 and the drain of the MOS transistor M10 are connected to the moving end of the second single-pole double-throw switch circuit, the source of the MOS transistor M8 and the drain of the MOS transistor M9 are connected to the first fixed end of the second single-pole double-throw switch, the source of the MOS transistor M10 and the drain of the MOS transistor M11 are connected to the first fixed end of the second single-pole double-throw switch, the source of the MOS transistor M9 and the source of the MOS transistor M11 are grounded, the gates of the MOS transistor M8 and the gates of the MOS transistor M11 are connected to the first control signal V1, and the gates of the MOS transistor M9 and the gates of the MOS transistor M11 are connected to the second control signal V2.

8. The adjustable bidirectional amplifier according to claim 1, 6 or 7, wherein: The first single-pole single-throw switch circuit includes a MOS transistor M6 , a drain and a source of the MOS transistor M6 are respectively connected to a first conduction terminal and a second conduction terminal of the first single-pole single-throw switch circuit, and a gate of the MOS transistor M6 is connected to a second control signal V2 .

9. The adjustable bidirectional amplifier according to claim 1, 6 or 7, wherein: The second single-pole single-throw switch circuit includes a MOS transistor M5 , a drain and a source of the MOS transistor M5 are respectively connected to the first conduction terminal and the second conduction terminal of the second single-pole single-throw switch circuit, and a gate of the MOS transistor M5 is connected to the first control signal V1 .

10. The adjustable bidirectional amplifier according to claim 1, 6 or 7, wherein: The third single-pole single-throw switch circuit includes a MOS transistor M7 , a drain and a source of the MOS transistor M7 are respectively connected to the first conduction terminal and the second conduction terminal of the third single-pole single-throw switch circuit, and a gate of the MOS transistor M7 is connected to the first control signal V1 .

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