Dual feedforward path low noise amplifier circuit and amplifier based on electromagnetic dual coupling

Abstract

The present invention provides a dual-feedforward path low-noise amplification circuit and an amplifier based on electromagnetic dual coupling, belonging to the technical field of integrated circuits, comprising: an input module, an output module, a transistor, a magnetic coupling feedforward path and an electrical coupling feedforward path; the input module is connected in series with the output module through a transistor, the magnetic coupling feedforward path is connected in parallel with the transistor, and the electrical coupling feedforward path is connected in parallel with the transistor; the magnetic coupling feedforward path is used to control the input matching and inter-stage matching between the input module and the transistor; the electrical coupling feedforward path is used to remove the coupling of the parasitic capacitance of the transistor; the input module is used to match the input signal to the transistor, the transistor is used to amplify the input signal, and the output module is used to match the amplified signal to the load, the equivalent transconductance is enhanced by the magnetic coupling feedforward path, the stability is guaranteed by the electrical coupling feedforward path, and the two feedforward paths guarantee a sufficiently high gain and a sufficiently low noise coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a dual-feedforward path low-noise amplification circuit and an amplifier based on electromagnetic dual coupling. Background Art

[0002] In recent years, communication technology has developed rapidly, and people have an increasing demand for wireless transmission data rates, and bandwidth has become a major bottleneck. Currently, most major commercial communication systems operate below 6 GHz, and increasing the operating frequency is an effective way to solve this bottleneck problem. In the past decade, millimeter wave communication technology has developed rapidly. For millimeter wave receivers, low-noise amplifiers are usually used as the first module of the RF front end. Its noise coefficient determines the signal-to-noise ratio of the entire receiving link, which in turn affects the communication quality. Therefore, the design of extremely low-noise amplifiers is imperative.

[0003] There are currently a variety of design methods for implementing millimeter-wave low-noise amplifiers, and there are three main mainstream solutions. The first is the source degenerate structure, which adds an inductor to the source end of the transistor to adjust the input impedance and the optimal noise impedance. This structure is currently the most widely used, but the disadvantage is that the source degenerate inductor will reduce the gain of the amplifier and it is difficult to achieve a broadband design. The second solution is to use a common-gate transistor as the input, because the input of the common-gate transistor is a low-resistance, which is easier to match the internal resistance of the input signal source or the impedance of the antenna (usually 50ohm). Therefore, this structure can usually achieve a larger bandwidth, but the noise factor is basically higher than that of the amplifier with a source degenerate structure, and the gain is difficult to be very high. In order to solve the problem of low gain, transconductance enhancement technology was later born. On the basis of the common-gate input, the signal is inversely coupled to the gate end of the transistor to increase the equivalent amplitude of the input signal. The third solution is a noise cancellation structure. The input signal is amplified by the common source and common gate respectively. Since the polarities of the common source and common gate output signals are opposite, the noise polarities are approximately the same. After the difference is made at the output end, the noise of the common gate transistor can be completely eliminated in theory. This structure is sensitive to design parameters and it is difficult to achieve good performance in the millimeter wave band.

[0004] Based on the above three low noise amplifier design schemes, the present invention proposes a new millimeter wave low noise amplifier with dual feedforward paths based on electromagnetic coupling. Summary of the invention

[0005] The present invention provides a dual-feedforward path low-noise amplification circuit and an amplifier based on electromagnetic dual coupling, which are used to solve the defect of poor stability of the low-noise amplifier in the prior art, and achieve low noise, high gain, high stability and low power consumption.

[0006] The present invention provides a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling, comprising: an input module, an output module, a transistor, a magnetic coupling feedforward path and an electric coupling feedforward path;

[0007] The input module is connected in series with the output module through the transistor, the magnetic coupling feedforward path is connected in parallel with the transistor, and the electrical coupling feedforward path is connected in parallel with the transistor;

[0008] The magnetic coupling feedforward path is used to control the input matching and inter-stage matching between the input module and the transistor; the electrical coupling feedforward path is used to remove the coupling of the parasitic capacitance of the transistor;

[0009] The input module is used to match the input signal to the transistor, the transistor is used to amplify the input signal, and the output module is used to match the amplified signal to the load.

[0010] According to a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the magnetic coupling feedforward path comprises: a first inductor, a second inductor and a third inductor;

[0011] The first inductor, the second inductor and the third inductor form a three-winding transformer, and the three-winding transformer is used to control input matching and inter-stage matching between the input module and the transistor.

[0012] According to a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, one end of the first inductor is connected to the source of the transistor and the input module respectively, and the other end of the first inductor is connected to a power supply;

[0013] One end of the second inductor is connected to the gate of the transistor, and the other end of the second inductor is connected to a bias voltage;

[0014] One end of the third inductor is connected to the drain of the transistor and the output module respectively, and the other end of the third inductor is grounded.

[0015] According to a dual feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the first inductor and the second inductor form a stacked structure, and the third inductor is stacked on the stacked structure formed by the first inductor and the second inductor, so that the coupling polarity between the first inductor and the second inductor is opposite.

[0016] According to a dual feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the wiring pattern between the third inductor and the second inductor is an "8" shape.

[0017] According to a dual feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the electrical coupling feedforward path comprises: a first capacitor;

[0018] One end of the first capacitor is connected to the source of the transistor, and the other end of the first capacitor is connected to the drain of the transistor;

[0019] The first capacitor is used to release the coupling control of the transistor itself.

[0020] According to a dual feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the size of the first capacitor is equal to the size of the parasitic capacitance of the transistor.

[0021] According to a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, the output module includes: a fourth inductor, a second capacitor and a fifth inductor;

[0022] The fourth inductor, the second capacitor and the fifth inductor form an LCL impedance matching network;

[0023] The LCL impedance matching network is used to match the output impedance to the load.

[0024] The present invention further provides an amplifier, comprising the dual feedforward path low-noise amplifier circuit based on electromagnetic dual coupling as described in any of the above embodiments.

[0025] The present invention also provides a multi-channel chip, comprising the amplifier as described above.

[0026] The present invention provides a dual-feedforward path low-noise amplification circuit and an amplifier based on electromagnetic dual coupling, comprising: an input module, an output module, a transistor, a magnetic coupling feedforward path and an electrical coupling feedforward path; the input module is connected in series with the output module through the transistor, the magnetic coupling feedforward path is connected in parallel with the transistor, and the electrical coupling feedforward path is connected in parallel with the transistor; the magnetic coupling feedforward path is used to control the input matching and inter-stage matching between the input module and the transistor; the electrical coupling feedforward path is used to remove the coupling of the parasitic capacitance of the transistor; the input module is used to match the input signal to the transistor, the transistor is used to amplify the input signal, and the output module is used to match the amplified signal to the load, the equivalent transconductance is enhanced by the magnetic coupling feedforward path, the stability is guaranteed by the electrical coupling feedforward path, and the two feedforward paths guarantee a sufficiently high gain and a sufficiently low noise coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the principle of a dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling provided by the present invention;

[0029] Figure 2 yes Figure 1 One of the specific circuit diagrams of the dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling;

[0030] Figure 3 yes Figure 1 The second specific circuit diagram of the dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling;

[0031] Figure 4 It is a schematic diagram of the principle of the chip layout provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0033] Combine the following Figure 1-Figure 2 The present invention describes a dual feedforward path low noise amplification circuit and an amplifier based on electromagnetic dual coupling.

[0034] Figure 1 : is a schematic diagram of the principle of a dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling provided by the present invention, Figure 2 yes Figure 1 One of the specific circuit diagrams of the dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling; Figure 3 yes Figure 1 The second specific circuit diagram of the dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling, Figure 4 It is a schematic diagram of the principle of the chip layout provided by an embodiment of the present invention.

[0035] like Figure 1As shown, a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling includes: an input module 1, an output module 2, a transistor 3, a magnetic coupling feedforward path 4 and an electric coupling feedforward path 5; wherein the input module 1 is connected in series with the output module 2 through the transistor 3, the magnetic coupling feedforward path 4 is connected in parallel with the transistor 3, and the electric coupling feedforward path 5 is connected in parallel with the transistor 3; the magnetic coupling feedforward path 4 is used to control the input matching and inter-stage matching between the input module 1 and the transistor 3; the electric coupling feedforward path 5 is used to remove the coupling of the parasitic capacitance of the transistor 3; the input module 1 is used to match the input signal to the transistor 3, the transistor 3 is used to amplify the input signal, and the output module 2 is used to match the amplified signal to the load. Among them, the input matching means that the internal resistance of the input signal source is equal to it and the input resistance, and the input matching can make the output power maximum, and the main function of the inter-stage matching is to realize impedance transformation, that is, to transform the impedance value given in advance into a more suitable impedance value.

[0036] In a specific implementation process, transistor 3 can adopt a common-gate transistor M1, and the magnetic coupling feedforward path 4 utilizes the coupling of magnetic flux to directly couple a part of the input signal to the common-gate transistor for output, thereby achieving input matching while enhancing the equivalent transconductance of the transistor and improving the gain. The electrically coupled feedforward path 5 effectively neutralizes the influence of the parasitic capacitance of the transistor itself.

[0037] The magnetic coupling feedforward path 4 includes: a first inductor Ls1, a second inductor Lg1 and a third inductor Ld1; the first inductor Ls1, i.e., the inductor connected to the source of the transistor, the second inductor Lg1, i.e., the inductor connected to the gate of the transistor and the third inductor Ld1, i.e., the inductor connected to the drain of the transistor, form a three-winding transformer, and the three-winding transformer is used to control the input matching and inter-stage matching between the input module 1 and the transistor. One end of the first inductor Ls1 is connected to the source of the transistor and the input module 1 respectively, and the other end of the first inductor Ls1 is connected to the power supply; one end of the second inductor Lg1 is connected to the gate of the transistor, and the other end of the second inductor Lg1 is connected to the bias voltage Vbias1; one end of the third inductor Ld1 is connected to the drain of the transistor and the output module 2 respectively, and the other end of the third inductor Ld1 is grounded. The first inductor Ls1 and the first inductor Lg1 form a stacked structure, and the third inductor Ld1 is stacked on the stacked structure formed by the first inductor Ls1 and the second inductor Lg1, so that the coupling polarities between the first inductor Ls1 and the second inductor Lg1 are opposite.

[0038] The magnetically coupled feedforward path 4 is mainly composed of a three-winding transformer with inductor stacking, that is, the first inductor Ls1, the second inductor Lg1 and the third inductor Ld1 of the common-gate transistor M1 used for input matching and inter-stage matching are used to form a three-coil transformer through the inductor stacking technology. The coupling between the first inductor Ls1 and the second inductor Lg1 strengthens the equivalent transconductance of the transistor and improves the gain while achieving input matching. The coupling between the third inductor Ld1 and the first inductor Ls1 / the second inductor Lg1 introduces the magnetically coupled feedforward path 4, and a part of the input signal is directly coupled to the output of the common-gate transistor by coupling of magnetic flux. Reasonable control of the coupling coefficient between the third inductor Ld1 and the first inductor Ls1 / the second inductor Lg1 can maximize the optimization of gain and noise performance while ensuring the stability of the amplifier.

[0039] The three-winding transformer with stacked inductors is designed based on the on-chip spiral inductor. First, the required inductance values ​​of the first inductor Ls1, the second inductor Lg1 and the third inductor Ld1 are roughly determined. Then the first inductor Ls1 and the second inductor Lg1 are stacked to ensure that the coupling polarity of the signal is inverted. Then the third inductor Ld1 is stacked on the gate-source inductor, where the gate-source inductor refers to the inductor after the first inductor and the second inductor are stacked. The coupling coefficient between the third inductor Ld1 and the gate-source inductor is controlled by the "8"-shaped routing method to achieve an optimal value of the overall performance. The "8"-shaped routing method is an inductor obtained by performing a first processing on the planar spiral inductor, and the first processing is to divide the planar spiral inductor into two parts of equal area, and flip one part of it by 180° while keeping the connection relationship unchanged. The "8"-shaped inductor can achieve a smaller coupling coefficient by controlling the relative size of the upper and lower coils of the "8" when the inductors are fully stacked. There is no need to reduce the coupling coefficient by misaligning the inductors, which is conducive to compact chip area. This three-winding transformer achieves input matching and inter-stage matching by occupying the area of ​​a traditional two-winding transformer. Figure 2 As shown, the mutual inductance coefficients K1, K2 and K3 are introduced into the magnetic coupling feedforward path 4. Based on the design schematic diagram of the three-winding transformer with inductor stacking, Ls1 and Lg1 are exactly the same in terms of routing, and are implemented using Metal9 and Metal8 respectively, to ensure as large a coupling coefficient as possible and enhance the equivalent transconductance. The design of Ld1 can first roughly determine the required inductance and the coupling coefficients k2 and k3 between Ls1 and Lg1, and then wind Ld1 into an asymmetric "8"-shaped inductor, control the coupling coefficient through the asymmetric two parts, and use Metal10 to implement it and directly stack it on Ls1 and Lg1 to achieve compactness in area.

[0040] Specifically, the electrically coupled feedforward path 5 includes: a first capacitor Cds1; one end of the first capacitor Cds1 is connected to the source of the transistor, and the other end of the first capacitor Cds1 is connected to the drain of the transistor; the first capacitor Cds1 is used to release the coupling control of the transistor itself, wherein the size of the first capacitor Cds1 is equal to the size of the parasitic capacitance of the transistor. It should be noted that in the specific implementation process, the first capacitor can be Cds1 or Figure 3 Cgs1 in.

[0041] Due to the existence of parasitic capacitance of transistors, input matching and output matching cannot be completely decoupled. In the design of differential transistors, a neutralization capacitor is usually introduced to eliminate the influence of parasitic capacitance. In the design of single-ended transistors, the present invention adds a first capacitor Cds1 to simulate the effect of the neutralization capacitor and provides an electrically coupled feedforward path. Because the source signal and the gate signal are inverted, the signals coupled to the drain through the first capacitor Cds1 and the parasitic capacitance will be completely offset, which improves the circuit stability and decouples the input and output matching. The first capacitor Cds1 of the common-gate transistor M1 is implemented by the parasitic capacitance between the top metal and the second top metal, and there is no need to insert an additional capacitor device, which is conducive to the compactness of the overall area. The capacitance value is approximately equal to the parasitic capacitance of the transistor, which is consistent with the value of the neutralization capacitor, indicating that the feedforward introduced by the first capacitor Cds1 and the feedforward of the parasitic capacitance can be relatively well offset, ensuring stability and decoupling. Figure 2 As shown, the first capacitor Cds1 introduces the electrically coupled feedforward path 5, and the first capacitor Cds1 in this embodiment can obtain the desired capacitance value by utilizing the parasitic coupling capacitance between Metal10 and Metal9. Figure 4 As shown, it is a 3D view of the chip layout, that is, a structural schematic diagram of the transistor on the circuit board, wherein the unfilled part of the wiring is the top metal, the filled part of the wiring is the sub-top metal, the gate, source and drain of the transistor M1 are respectively connected to the circuit through the sub-top metal, and the capacitor Cds1 is realized by the parasitic capacitance between the top metal and the sub-top metal.

[0042] The present embodiment provides a dual-feedforward path low-noise amplifier circuit based on electromagnetic dual coupling, comprising: an input module 1, an output module 2, a transistor, a magnetic coupling feedforward path 4 and an electrical coupling feedforward path 5; the input module 1 is connected in series with the output module 2 through the transistor, the magnetic coupling feedforward path 4 is connected in parallel with the transistor, and the electrical coupling feedforward path 5 is connected in parallel with the transistor; the magnetic coupling feedforward path 4 is used to control the input matching and inter-stage matching between the input module 1 and the transistor; the electrical coupling feedforward path 5 is used to release the coupling control of the transistor itself; the input module 1 is used to match the input signal to the transistor, the transistor is used to amplify the input signal, and the output module 2 is used to match the amplified signal to the load, the equivalent transconductance is enhanced by the magnetic coupling feedforward path 4, the stability is ensured by the electrical coupling feedforward path 5, and the two feedforward paths ensure a sufficiently high gain and a sufficiently low noise coefficient.

[0043] Furthermore, the output module 2 in this embodiment includes: a fourth inductor Ld2, a second capacitor Cd2 and a fifth inductor Lout; the fourth inductor Ld2, the second capacitor Cd2 and the fifth inductor Lout constitute an LCL impedance matching network; the LCL impedance matching network is used to match the output impedance to a 50ohm load. The transistor may include a primary transistor M1 and a secondary transistor M2. The low-noise amplifier circuit based on electromagnetic coupling and dual feedforward paths in the millimeter-wave Ka band in this embodiment has an operating range of 25GHz-30GHz. In actual operation, the input signal is input to the common-gate transistor M1 through a three-winding transformer, and the output of the common-gate transistor M1 is transmitted to the input end of the second-stage common-source transistor M2, and the output of the common-source transistor M2 is output to the matching load through an LCL matching network. The gate of the common source transistor M2 is connected to the drain of the common gate transistor M1, the source of the common source transistor M2 is grounded, the drain of the common source transistor M2 is connected to the fourth inductor Ld2, the other end of the fourth inductor Ld2 is connected to the high level VDD, the drain of the common source transistor M2 is also connected to the output end and the fifth inductor Lout respectively through the second capacitor Cd2, and the other end of the fifth inductor Lout is grounded. Among them, Cd1 is a DC blocking capacitor and is used for impedance matching. Figure 2 The main function of the middle resistor R is to provide an AC open circuit for the bias voltage Vbias2 to prevent signal leakage.

[0044] The 25GHz-30GHz low-noise amplifier circuit based on electromagnetic coupling dual feedforward paths adopted by the present invention adopts a new matching network to construct two signal feedforward paths of electric coupling and magnetic coupling, and achieves a noise coefficient below 2dB in the Ka band with a smaller overall area, which is more conducive to the application of multi-channel chips such as phased arrays, and adopts a new circuit structure: high gain, good stability, low noise coefficient, small layout area, and low power consumption. The main advantages include the following:

[0045] 1. High gain: The three-winding transformer technology based on inductor stacking in the present invention improves the overall gain of the circuit as much as possible under the premise of ensuring stability due to the introduction of transconductance enhancement and magnetic coupling feedforward path.

[0046] 2. Good stability: Although two electromagnetic feedforward paths are introduced, the coupling coefficient of magnetic coupling is not large, which will not have a particularly large impact on stability. The electrical coupling path offsets the feedback path introduced by the parasitic capacitance of the transistor, so that the input and output of the common gate transistor are decoupled, and the stability is enhanced to a certain extent.

[0047] 3. Low noise factor: By introducing the feedforward path of electromagnetic coupling, the optimal noise impedance is adjusted, and a large isolation resistor is added to the transistor substrate, so that the overall circuit has an extremely low noise factor.

[0048] 4. Small layout area: The three-winding transformer with stacked inductors only occupies the area of ​​a traditional two-coil transformer to realize the functions of two matching networks: input matching and inter-stage matching. Finally, the output stage matching also uses an "8"-shaped inductor to realize an LCL matching network, which only consumes the area of ​​an inductor.

[0049] Based on the same general inventive concept, the present application also protects an amplifier. An amplifier in this embodiment includes a dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling as in any of the above embodiments.

[0050] Based on the same general inventive concept, the present application also protects a multi-channel chip. A multi-channel chip in this embodiment includes an amplifier as in any of the above embodiments.

[0051] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0052] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling, characterized in that: include: An input module, an output module, a transistor, a magnetically coupled feedforward path, and an electrically coupled feedforward path; The input module is connected in series with the output module through the transistor, the magnetic coupling feedforward path is connected in parallel with the transistor, and the electrical coupling feedforward path is connected in parallel with the transistor; The magnetic coupling feedforward path is used to control the input matching and inter-stage matching between the input module and the transistor; the electrical coupling feedforward path is used to remove the coupling of the parasitic capacitance of the transistor; The input module is used to match the input signal to the transistor, the transistor is used to amplify the input signal, and the output module is used to match the amplified signal to the load.

2. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 1, characterized in that: The magnetically coupled feedforward path includes: a first inductor, a second inductor and a third inductor; The first inductor, the second inductor and the third inductor form a three-winding transformer, and the three-winding transformer is used to control input matching and inter-stage matching between the input module and the transistor.

3. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 2, characterized in that: One end of the first inductor is connected to the source of the transistor and the input module respectively, and the other end of the first inductor is connected to a power supply; One end of the second inductor is connected to the gate of the transistor, and the other end of the second inductor is connected to a bias voltage; One end of the third inductor is connected to the drain of the transistor and the output module respectively, and the other end of the third inductor is grounded.

4. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 2, characterized in that: The first inductor and the second inductor form a stacked structure, and the third inductor is stacked on the stacked structure formed by the first inductor and the second inductor, so that the coupling polarities between the first inductor and the second inductor are opposite.

5. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 4, characterized in that: The wiring pattern between the third inductor and the second inductor is an "8" shape.

6. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 1, characterized in that: The electrically coupled feedforward path includes: a first capacitor; One end of the first capacitor is connected to the source of the transistor, and the other end of the first capacitor is connected to the drain of the transistor; The first capacitor is used to remove the coupling of the parasitic capacitance of the transistor.

7. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to claim 6, characterized in that: The size of the first capacitor is equal to the size of the parasitic capacitance of the transistor.

8. The dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling according to any one of claims 1 to 7, characterized in that: The output module includes: a fourth inductor, a second capacitor and a fifth inductor; The fourth inductor, the second capacitor and the fifth inductor form an LCL impedance matching network; The LCL impedance matching network is used to match the output impedance to the load.

9. An amplifier, characterized in that: It comprises a dual feedforward path low noise amplifier circuit based on electromagnetic dual coupling as described in any one of claims 1 to 8.

10. A multi-channel chip, characterized in that: Comprising the amplifier of claim 9.

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