Broadband low-noise amplifier based on three-coil coupling transformer

Abstract

The invention provides a broadband low-noise amplifier based on a three-coil coupling transformer. The broadband low-noise amplifier comprises an input matching network, a common-source differential output driving stage amplifier, an inter-stage matching network, a common-source differential output power stage amplifier and an output matching network which are connected in sequence, broadband matching is realized by using the input matching network and the inter-stage matching network, and the effective transconductance of the transistor is improved; through the cross-coupled capacitors, the LNA gain and stability on a broadband are improved, better isolation is realized, and input and output are decoupled; due to the design of the grounding capacitor, the linearity of the LNA is improved; through the combination of the three-coil coupling transformer and the differential topology, output signals are superposed in the same direction at the output end, and noise is cancelled in the reverse direction at the output end, so that the thermal noise is greatly inhibited, the isolation is improved through the output matching network, the insertion loss is reduced, and the output matching performance is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of amplifiers, and in particular to a broadband low-noise amplifier based on a three-coil coupled transformer. Background Art

[0002] 5G satellite communication plays an important role in modern wireless communication systems and is widely used in fields such as high-speed data transmission and global network coverage. Currently, the development of 5G communication has promoted the improvement of mobile broadband capabilities, increasing the data rate by dozens of times compared to the past. Its enhanced network connection capabilities have significantly improved the reliability and stability of communication.

[0003] Existing 5G wireless network construction uses different FR2 frequency bands. Although it can meet communication requirements, cross-border 5G network roaming still faces technical and economic challenges. Broadband millimeter-wave systems are considered one of the important supporting technologies. In 5G systems, the application of high spectral efficiency modulation methods enables the system to have a high peak-to-average power ratio (PAPR) and a wide radio frequency bandwidth. Although these characteristics have improved data throughput capabilities, they also pose higher requirements for the radio frequency performance of base stations and terminal devices.

[0004] A low-noise amplifier (LNA) is a key module in the receiver link, and its performance directly affects the signal reception quality and overall communication capabilities of the system. The LNA in a millimeter-wave phased array satellite terminal needs to have the characteristics of low noise, high gain, low power consumption, and high linearity. However, existing technical solutions still have certain limitations when meeting these requirements.

[0005] Some LNA solutions adopt a multi-stage amplification structure to improve gain and bandwidth. However, this often brings higher power consumption and a complex bias network, making it difficult to meet the requirements of low-power applications. Other solutions reduce the noise figure through noise matching optimization, but may sacrifice gain performance, resulting in a decrease in the signal-to-noise ratio of the system. In addition, some designs use inductive feedback or active load tuning techniques to expand the bandwidth, but rely on additional active devices, increasing power consumption and reducing circuit stability.

[0006] It can be seen that existing LNA designs still have deficiencies in meeting the requirements of 5G millimeter-wave phased array receivers. It is mainly reflected in the difficulty of simultaneously meeting the performance requirements of low noise, high gain, low power consumption, and high linearity. In addition, in the high-frequency millimeter-wave band, nonlinear effects affect the signal processing ability of the LNA, making it a major challenge to optimize the linearity of the LNA. Summary of the Invention

[0007] Aiming at the deficiencies of the existing technology, the present invention provides a broadband low-noise amplifier based on a three-coil coupled transformer, which can reduce system power loss, reduce noise, and meet the requirements of high gain and linearity.

[0008] The technical solution of the present invention is as follows: A broadband low-noise amplifier based on a three-coil coupled transformer, which includes an input matching network, a common-source differential output driving stage amplifier, an inter-stage matching network, a common-source differential output power stage amplifier, and an output matching network; the input matching network is connected to the inter-stage matching network through the common-source differential output driving stage amplifier; the inter-stage matching network is connected to the output through the common-source differential output power stage amplifier and the output matching network; wherein, a three-coil transformer coupling structure is introduced into the input matching network and the inter-stage matching network; the inter-stage matching network adopts a method of multiplexing the common power supply voltage and the DC bias.

[0009] Preferably, the input matching network includes a first inductor L1, a second inductor L2, and a third inductor L3; the first inductor L1, the second inductor L2, and the third inductor L3 form a three-coil coupled transformer structure; wherein, one end of the first inductor L1 is connected to the input end input; the other end of the first inductor L1 is grounded; the second inductor L2 and the third inductor L3 are connected to the common-source differential output driving stage amplifier, and the center tap of the second inductor L2 is connected to the DC bias Vb1; the center tap of the third inductor L3 is grounded, while achieving broadband matching, greatly improving the effective transconductance of the transistor, and realizing the general boost function.

[0010] Preferably, the common-source differential output driving stage amplifier includes a first transistor D1, a second transistor D2, a first capacitor C1, and a second capacitor C2; the gate of the first transistor D1 is respectively connected to the second inductor L2 and the first capacitor C1; the source of the first transistor D1 is connected to the third inductor L3; the drain of the first transistor D1 is connected to the inter-stage matching network; the other end of the first capacitor C1 is respectively connected to the drain of the second transistor D2 and the inter-stage matching network;

[0011] the gate of the second transistor D2 is respectively connected to the second inductor L2 and the second capacitor C2; the source of the second transistor D2 is connected to the third inductor L3; the drain of the second transistor D2 is connected to the inter-stage matching network; the other end of the second capacitor C2 is respectively connected to the drain of the first transistor D1 and the inter-stage matching network; the first capacitor C1 and the second capacitor C2 are cross-coupled.

[0012] Preferably, the inter-stage matching network includes a fourth inductor L4, a fifth inductor L5, and a sixth inductor L6; the fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 form a three-coil coupled transformer structure; two ends of the fourth inductor L4 are respectively connected to a drain of a first transistor D1 and a drain of a second transistor D2, and are also connected to a first capacitor C1 and a second capacitor C2; the fifth inductor L5 and the sixth inductor L6 are connected to a common-source differential output power stage amplifier.

[0013] Preferably, the left side of the inter-stage matching network has a low Q value due to the output impedance of the driving stage transistor, and the right side has a high Q value due to the high impedance of the power stage gate, and the bias voltage Vb and the supply voltage VDD of the output matching transformer are multiplexed to achieve DC current multiplexing.

[0014] Preferably, the common-source differential output power stage amplifier includes a third transistor D3, a fourth transistor D4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; a gate of the third transistor D3 is respectively connected to the fifth inductor L5, the third capacitor C3, and the fifth capacitor C5; a source of the third transistor D3 is connected to the sixth inductor L6; a drain of the third transistor D3 is respectively connected to an output matching network and the sixth capacitor C6;

[0015] The gate of the fourth transistor D4 is respectively connected to the fifth inductor L5, the fourth capacitor C4, and the sixth capacitor C6; the source of the fourth transistor D4 is connected to the sixth inductor L6; the drain of the fourth transistor D4 is connected to the fifth capacitor C5 and the output matching network.

[0016] Preferably, the output matching network includes a seventh inductor L7 and an eighth inductor L8, and two ends of the seventh inductor L7 are respectively connected to the drains of the third transistor D3 and the fourth transistor D4; and are connected to the fifth capacitor C5 and the sixth capacitor C6;

[0017] A center tap of the seventh inductor L7 is connected to the supply voltage VDD, and two ends of the eighth inductor L8 are respectively connected to the outputs out+ and out-.

[0018] Preferably, the seventh inductor L7 and the eighth inductor L8 form a high-Q value and strongly coupled two-coil transformer structure.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The inductors of the input matching network and the inter-stage matching network of the present invention form two three-coil coupled transformer structures, realizing broadband matching and improving the effective transconductance of the transistor;

[0021] 2. The common-source differential output driver-stage amplifier of the present invention improves the LNA gain and stability over a wide band through cross-coupled capacitors, achieves better isolation, decouples the input and output, and simplifies the wide-band design;

[0022] 3. The combination of the three-coil coupled transformer and the differential topology in the present invention enables the output signals to be superposed in the same direction at the output end and the noises to be cancelled out in the opposite direction at the output end, thereby greatly suppressing the thermal noise. In addition to achieving the same function as the input matching network, the inter-stage matching network also multiplexes the supply voltage VDD and the DC bias Vb1 of the common millimeter-wave signal path, reduces the power consumption of each stage of the amplifier, and achieves the purpose of low-power design;

[0023] 4. The common-source differential output power-stage amplifier of the present invention forms a voltage division at the input by adding two capacitors in series with the parasitic capacitance between the gate and source of the driver-stage amplifier, improves the linearity, and uses two inductors of the output matching network to form a high-Q strongly coupled double-coil transformer structure, which improves the isolation and reduces the insertion loss, and optimizes the output matching performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the circuit diagram of the low-noise amplifier of the present invention;

[0025] Figure 2 is the structural schematic diagram of the input matching network of the present invention;

[0026] Figure 3 is the schematic diagram of the common-source differential driver-stage output amplifier of the present invention;

[0027] Figure 4 is the structural schematic diagram of the inter-stage matching network of the present invention;

[0028] Figure 5 is the schematic diagram of the common-source differential power-stage output amplifier of the present invention;

[0029] Figure 6 is the structural schematic diagram of the output matching network of the present invention;

[0030] Figure 7 is the post-simulation result diagram of the S parameters of the low-noise amplifier of the present invention;

[0031] Figure 8 is the post-simulation result diagram of the LNA noise figure of the low-noise amplifier of the present invention;

[0032] Figure 9 is the post-simulation result diagram of the stability factor Kf of the low-noise amplifier of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following further describes the specific embodiments of the present invention in conjunction with the drawings:

[0034] As Figure 1 shown, this embodiment provides a broadband low-noise amplifier based on a three-coil coupled transformer. In this embodiment, the low-noise amplifier is designed using TSMC 40-nanometer CMOS process; it includes an input matching network, a common-source differential output driving stage amplifier, an inter-stage matching network, a common-source differential output power stage amplifier, and an output matching network; the input matching network is connected to the inter-stage matching network through the common-source differential output driving stage amplifier; the inter-stage matching network is connected to the output through the common-source differential output power stage amplifier and the output matching network; among them, a three-coil transformer coupling structure is introduced in the input matching network and the inter-stage matching network; the inter-stage matching network adopts a method of multiplexing the common power supply voltage and the DC bias. The input matching network uses a multi-layer metal design to achieve a compact core size of 160×200μm, the inter-stage matching transformer size is 140×270μm, and the output matching transformer size is 130×200μm; the operating frequency band of the present invention is 17.9 - 32.1 GHz; the common-source differential output driving stage amplifier uses a transistor size of 256um / 40nm, and the common-source differential output power stage amplifier uses a transistor size of 512um / 40nm.

[0035] Preferably, as Figure 1 and 2 shown, the input matching network includes a first inductor L1, a second inductor L2, and a third inductor L3; the first inductor L1, the second inductor L2, and the third inductor L3 form a three-coil coupled transformer structure, which greatly improves the effective transconductance of the transistor while achieving broadband matching and realizes the general boost function. Among them, one end of the first inductor L1 is connected to the input terminal input; the other end of the first inductor L1 is grounded; the second inductor L2 and the third inductor L3 are connected to the common-source differential output driving stage amplifier, and the center tap of the second inductor L2 is connected to the DC bias Vb1; the center tap of the third inductor L3 is grounded, which greatly improves the effective transconductance of the transistor while achieving broadband matching and realizes the general boost function. In this embodiment, the inductance of the first inductor L1 is 692 pH, the inductance of the second inductor L2 is 214 pH, and the inductance of the third inductor L3 is 204 pH.

[0036] Preferably, as Figure 1 and 3As shown, the common-source differential output driving stage amplifier includes a first transistor D1, a second transistor D2, a first capacitor C1, and a second capacitor C2; the gate of the first transistor D1 is respectively connected to the second inductor L2 and the first capacitor C1; the source of the first transistor D1 is connected to the third inductor L3; the drain of the first transistor D1 is connected to the inter-stage matching network; the other end of the first capacitor C1 is respectively connected to the drain of the second transistor D2 and the inter-stage matching network;

[0037] the gate of the second transistor D2 is respectively connected to the second inductor L2 and the second capacitor C2; the source of the second transistor D2 is connected to the third inductor L3; the drain of the second transistor D2 is connected to the inter-stage matching network; the other end of the second capacitor C2 is respectively connected to the drain of the first transistor D1 and the inter-stage matching network; the first capacitor C1 and the second capacitor C2 are cross-coupled, which improves the LNA gain and stability in the broadband, achieves better isolation, decouples the input and output, simplifies the broadband design, and the combination of the three-coil coupled transformer and the differential topology makes the output signals superimpose in the same direction at the output end and the noise cancel each other out in the opposite direction at the output end, thereby greatly suppressing the thermal noise; in this embodiment, the capacitances of the first capacitor C1 and the second capacitor C2 are both 30 fF.

[0038] Preferably in this embodiment, as Figure 1 and 4 shown, the inter-stage matching network includes a fourth inductor L4, a fifth inductor L5, and a sixth inductor L6; the fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 form a three-coil coupled transformer structure; the two ends of the fourth inductor L4 are respectively connected to the drain of the first transistor D1 and the drain of the second transistor D2, and are also connected to the first capacitor C1 and the second capacitor C2; the fifth inductor L5 and the sixth inductor L6 are connected to the common-source differential output power stage amplifier. In this embodiment, the inductance of the fourth inductor L4 is 753 pH, the inductance of the fifth inductor L5 is 316.8 pH, and the inductance of the sixth inductor L6 is 93.9 pH.

[0039] In this embodiment, in addition to realizing the same functions as the input matching network, the inter-stage matching network also multiplexes the bias voltage Vb and the supply voltage VDD of the output matching transformer, realizing the reuse of the DC current, which effectively reduces the DC power consumption of each amplifier stage, thus realizing the low-power LNA design; the left side of the matching network has a low Q value due to the output impedance of the driving stage transistor, and the right side has a high Q value due to the high impedance of the power stage gate.

[0040] Preferably in this embodiment, as Figure 1 and 5As shown, the common-source differential output power stage amplifier includes a third transistor D3, a fourth transistor D4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; the gate of the third transistor D3 is connected to a fifth inductor L5, the third capacitor C3, and the fifth capacitor C5 respectively; the source of the third transistor D3 is connected to a sixth inductor L6; the drain of the third transistor D3 is connected to an output matching network and the sixth capacitor C6 respectively;

[0041] The gate of the fourth transistor D4 is connected to the fifth inductor L5, the fourth capacitor C4, and the sixth capacitor C6 respectively; the source of the fourth transistor D4 is connected to the sixth inductor L6; the drain of the fourth transistor D4 is connected to the fifth capacitor C5 and the output matching network.

[0042] In this embodiment, the third capacitor C3 and the fourth capacitor C4 are grounded and are connected in series with the parasitic capacitance between the gate and source of the common-source differential drive stage amplifier to form a voltage division at the input, improving linearity.

[0043] As a preference of this embodiment, as Figure 1 and 6 shown, the output matching network includes a seventh inductor L7 and an eighth inductor L8. The two ends of the seventh inductor L7 are connected to the drains of the third transistor D3 and the fourth transistor D4 respectively; and are connected to the fifth capacitor C5 and the sixth capacitor C6; the center tap of the seventh inductor L7 is connected to the supply voltage VDD, and the two ends of the eighth inductor L8 are connected to the outputs out+ and out- respectively. The seventh inductor L7 and the eighth inductor L8 form a high-Q value and strongly coupled double-coil transformer structure. It improves isolation and reduces insertion loss, optimizing the output matching performance. In this embodiment, the inductance of the seventh inductor is 677.5 pH, and the inductance of the eighth inductor L8 is 202.8 pH.

[0044] In this embodiment, the broadband low-noise amplifier operates as follows:

[0045] First, the input signal passes through the input matching network. The three inductors, namely the first inductor L1, the second inductor L2, and the third inductor L3, form a three-coil coupled transformer structure. While achieving broadband matching, the effective transconductance of the transistor is greatly enhanced through the magnetic coupling between the transformer coils, realizing the general voltage boost function;

[0046] Subsequently, the signal enters the common-source differential output driver stage amplifier. Through the cross-coupled first capacitor C1 and second capacitor C2, the LNA gain and stability in the broadband are improved, better isolation is achieved, the input and output are decoupled to simplify the broadband design. The combination of the three-coil coupled transformer and the differential topology makes the output signals superpose in the same direction at the output end and the noise cancel each other out in the opposite direction at the output end, thus greatly suppressing the thermal noise;

[0047] Next, the signal passes through the inter-stage matching network. In addition to performing the same function as the input matching network, the matching network also multiplexes the supply voltage VDD and the DC bias Vb1 of the common millimeter-wave signal path, reducing the power consumption of each stage of the amplifier to achieve the purpose of low-power design;

[0048] After that, it enters the common-source differential output power stage amplifier. In addition to being similar in structure to the common-source differential driver stage amplifier, a third capacitor C3 and a fourth capacitor C4 are additionally added. The third capacitor C3 and the fourth capacitor C4 are grounded. Their function is to be connected in series with the parasitic capacitance between the gate and source of the common-source differential driver stage amplifier to form a voltage division at the input and improve the linearity;

[0049] Subsequently, the signal enters the output matching network. The seventh inductor L7 and the eighth inductor L8 form a high-Q value and strongly coupled two-coil transformer structure, improving the isolation degree and reducing the insertion loss, and optimizing the output matching performance.

[0050] The broadband low-noise amplifier of this embodiment realizes the amplification of millimeter-wave signals with broadband, high gain, low noise and low power consumption, and is applicable to high-frequency communication systems.

[0051] As Figure 7 shown, the input return loss S11 is lower than -15 dB in the range of 22.8 GHz to 27.9 GHz, and the output return loss S22 is lower than -10 dB in the range of 23.5 GHz to 28.6 GHz. At 24.4 GHz, the peak gain of S21 is 13 dB, the 3 dB bandwidth is 12.4 GHz (from 18 GHz to 30.4 GHz), and the in-band gain flatness is less than 1.5 dB in the frequency band range of 18.74 - 29.2 GHz, indicating that the LNA has achieved good broadband matching, output matching and power matching, and also indicating that the transconductance enhancement effect can improve the gain of this LNA.

[0052] As Figure 8 shown, in the frequency band range of 24 GHz - 28 GHz, the noise figure is 3.2 dB - 3.5 dB. This result shows that the noise cancellation mechanism of the proposed three-coil coupled transformer has a good effect and can realize a broadband low-noise figure LNA.

[0053] As Figure 9As shown, within the frequency band, this coefficient is greater than 1, indicating that the designed LNA has the property of unconditional stability.

[0054] The above embodiments and descriptions in the specification only illustrate the principles and the best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed present invention.

Claims

1. A broadband low-noise amplifier based on a three-coil coupled transformer, characterized in that, It includes an input matching network, a common-source differential output driving stage amplifier, an inter-stage matching network, a common-source differential output power stage amplifier, and an output matching network; the input matching network is connected to the inter-stage matching network through the common-source differential output driving stage amplifier; the inter-stage matching network is connected to the output through the common-source differential output power stage amplifier and the output matching network; wherein, a three-coil transformer coupling structure is introduced in the input matching network and the inter-stage matching network; the inter-stage matching network adopts a method of multiplexing the common power supply voltage and the DC bias.

2. The broadband low-noise amplifier based on a three-coil coupled transformer according to claim 1, wherein: The input matching network includes a first inductor L1, a second inductor L2, and a third inductor L3; one end of the first inductor L1 is connected to the input terminal input; the other end of the first inductor L1 is grounded; the second inductor L2 and the third inductor L3 are connected to the common-source differential output driving stage amplifier, and the center tap of the second inductor L2 is connected to the DC bias Vb1; the center tap of the third inductor L3 is grounded.

3. The broadband low-noise amplifier based on a three-coil coupled transformer according to claim 2, wherein: The common-source differential output driving stage amplifier includes a first transistor D1, a second transistor D2, a first capacitor C1, and a second capacitor C2; the gate of the first transistor D1 is respectively connected to the second inductor L2 and the first capacitor C1; the source of the first transistor D1 is connected to the third inductor L3; the drain of the first transistor D1 is connected to the inter-stage matching network; the other end of the first capacitor C1 is respectively connected to the drain of the second transistor D2 and the inter-stage matching network; The gate of the second transistor D2 is respectively connected to the second inductor L2 and the second capacitor C2; the source of the second transistor D2 is connected to the third inductor L3; the drain of the second transistor D2 is connected to the inter-stage matching network; the other end of the second capacitor C2 is respectively connected to the drain of the first transistor D1 and the inter-stage matching network; the first capacitor C1 and the second capacitor C2 are cross-coupled.

4. A broadband low-noise amplifier based on a three-coil coupled transformer according to claim 3, characterized in that: The inter-stage matching network includes a fourth inductor L4, a fifth inductor L5, and a sixth inductor L6; both ends of the fourth inductor L4 are respectively connected to the drain of the first transistor D1 and the drain of the second transistor D2, and are also connected to the first capacitor C1 and the second capacitor C2; the fifth inductor L5 and the sixth inductor L6 are connected to the common-source differential output power stage amplifier.

5. The broadband low-noise amplifier based on a three-coil coupled transformer according to claim 4, characterized in that: The first inductor L1, the second inductor L2, and the third inductor L3 form a three-coil coupling transformer structure; The fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 form a three-coil coupling transformer structure.

6. A broadband low-noise amplifier based on a three-coil coupled transformer according to claim 4, characterized in that: The left side of the inter-stage matching network has a low Q value due to the output impedance of the driving stage transistor, and the right side has a high Q value due to the high impedance of the power stage gate, and the bias voltage Vb1 and the supply voltage VDD of the output matching transformer are multiplexed to achieve DC current multiplexing.

7. A broadband low-noise amplifier based on a three-coil coupled transformer according to claim 4, characterized in that: The described common-source differential output power stage amplifier includes a third transistor D3, a fourth transistor D4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; the gate of the third transistor D3 is connected to a fifth inductor L5, the third capacitor C3, and the fifth capacitor C5 respectively; the source of the third transistor D3 is connected to a sixth inductor L6; the drain of the third transistor D3 is connected to an output matching network and the sixth capacitor C6 respectively; the gate of the fourth transistor D4 is connected to the fifth inductor L5, the fourth capacitor C4, and the sixth capacitor C6 respectively; the source of the fourth transistor D4 is connected to the sixth inductor L6; the drain of the fourth transistor D4 is connected to the fifth capacitor C5 and the output matching network respectively; the fifth capacitor C5 and the sixth capacitor C6 are cross-coupled.

8. A broadband low-noise amplifier based on a three-coil coupled transformer according to claim 7, characterized in that: The described output matching network includes a seventh inductor L7 and an eighth inductor L8. The two ends of the seventh inductor L7 are connected to the drains of the third transistor D3 and the fourth transistor D4 respectively, and are also connected to the fifth capacitor C5 and the sixth capacitor C6. The center tap of the seventh inductor L7 is connected to the supply voltage VDD, and the two ends of the eighth inductor L8 are connected to the outputs out+ and out- respectively.

9. The broadband low-noise amplifier based on a three-coil coupled transformer according to claim 8, wherein: The seventh inductor L7 and the eighth inductor L8 form a high-Q and strongly coupled double-coil transformer structure.

10. The broadband low-noise amplifier based on a three-coil coupled transformer according to claim 9, characterized in that: First, the input signal passes through the input matching network. While achieving broadband matching through the three-coil coupled transformer structure formed by the first inductor L1, the second inductor L2, and the third inductor L3, the effective transconductance of the transistor is increased through the magnetic coupling between the transformer coils. Subsequently, the signal enters the common-source differential output driving stage amplifier. The cross-coupled first capacitor C1 and second capacitor C2 are used to increase the LNA gain and stability over a wide bandwidth and decouple the input and output. The combination of the three-coil coupled transformer and the differential topology causes the output signals to be superposed in the same direction at the output end and the noises to cancel each other out in the opposite direction at the output end. Then, the signal passes through the inter-stage matching network. In addition to achieving the same functions as the input matching network, the matching network also multiplexes the supply voltage VDD and the DC bias Vb1 of the common millimeter-wave signal path to reduce the power consumption of each stage of the amplifier. After that, it enters the common-source differential output power stage amplifier. The third capacitor C3 and the fourth capacitor C4 are connected in series with the parasitic capacitance between the gate and source of the common-source differential driving stage amplifier to form a voltage division at the input and improve the linearity. Subsequently, the signal enters the described output matching network. The seventh inductor L7 and the eighth inductor L8 improve the isolation and reduce the insertion loss to optimize the output matching.

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