Amplification circuit and electronic equipment

Abstract

The embodiment of the invention discloses an amplification circuit and electronic equipment, and the amplification circuit comprises an input matching unit which is used for matching impedance between an input end of a gain unit and a signal source, and the input matching unit is provided with a signal receiving end and a first output end. The correction unit is used for generating a compensation signal, and the compensation signal comprises a non-linear component. The gain unit receives the impedance-matched first signal output by the input matching unit and performs transconductance amplification on the first signal to generate a second signal; the compensation signal is received, the compensation signal and the second signal are superposed and then are further amplified to generate and output a third signal, and the compensation signal and the second signal are opposite in electrical property. And the output matching unit is used for matching impedance between the output end of the gain unit and the load so as to perform impedance matching processing on the received third signal and output the third signal subjected to the impedance matching processing.

Description

Technical Field

[0001] The present invention relates to the technical field of amplifiers, and in particular to an amplifier circuit and electronic equipment. Background Art

[0002] As mobile wireless communication technology gradually evolves from 2G to 5G and even 6G in the future, communication systems have put forward higher requirements on the performance of RF front-end devices. In wireless communication, after long-distance transmission, the signal often becomes extremely weak and mixed with a lot of noise when it reaches the receiving end. As the first active module at the front end of the receiver, the low-noise amplifier is mainly responsible for amplifying the received weak signal, and its performance directly determines the overall quality of the communication system. Therefore, it is necessary to design a broadband, high-linearity, low-noise amplifier to ensure that the signal is not distorted during the reception and amplification process, so as to meet the needs of high-speed and large-capacity communication.

[0003] Furthermore, with the increasing shortage of spectrum resources in modern wireless communications, complex modulation technologies such as orthogonal frequency division multiplexing (OFDM) are widely used to improve spectrum utilization. This type of modulation method has extremely high requirements for signal linearity, otherwise it will cause signal distortion and interference, and in severe cases, it will also affect the performance of the communication system. In order to improve the bandwidth and linearity of the low-noise amplifier, the existing technology usually needs to sacrifice other performance parameters (such as noise figure or gain). If the gain of the amplifier circuit is reduced and the noise is increased on the basis of improving the bandwidth and linearity, the sensitivity of the receiver will be reduced, affecting the receiver's reception of weak signals. Summary of the invention

[0004] Embodiments of the present invention provide an amplifier circuit and an electronic device, aiming to improve the bandwidth and linearity of the amplifier circuit without compromising other performance indicators (such as noise figure and gain) of the amplifier circuit.

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

[0006] In one aspect, an amplifier circuit is provided, comprising: an input matching unit, a gain unit, a correction unit, and an output matching unit;

[0007] The input matching unit is used to match the impedance between the input end of the gain unit and the signal source, and the input matching unit has a signal receiving end and a first output end, the signal receiving end is used to receive the first signal, and the first output end is used to output the first signal after impedance matching;

[0008] The correction unit receives the first signal passing through the gain unit through the gain unit, and performs negative transconductance compensation on the first signal to generate a compensation signal, wherein the compensation signal includes a nonlinear component;

[0009] The gain unit receives the impedance-matched first signal output by the input matching unit, and performs transconductance amplification on the first signal to generate a second signal; receives the compensation signal, superimposes the compensation signal and the second signal, and further amplifies the signal to generate and output a third signal, wherein the electrical properties of the compensation signal and the second signal are opposite;

[0010] The output matching unit is used to match the impedance between the output end of the gain unit and the load, so as to perform impedance matching processing on the received third signal, and output the third signal after the impedance matching processing;

[0011] The first signal is a weak signal to be amplified in the form of voltage, and the second signal, the compensation signal and the third signal are all in the form of current.

[0012] In addition to or as an alternative to one or more of the features disclosed above, the gain unit includes a first N-type switch tube M1 and a second N-type switch tube M2, and the first N-type switch tube M1 and the second N-type switch tube M2 are both in a saturation region;

[0013] The gate terminal of the first N-type switch tube M1 is connected to the first output terminal, the source terminal of the first N-type switch tube M1 is grounded, the drain terminal of the first N-type switch tube M1 is connected to the source terminal of the second N-type switch tube M2, and the drain terminal of the second N-type switch tube M2 is connected to the input terminal of the output matching unit.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the source terminal of the first N-type switch tube M1 is connected to the ground through a negative feedback inductor LS.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the correction unit includes a third N-type switch tube M3 and a fourth N-type switch tube M4, and the third N-type switch tube M3 and the fourth N-type switch tube M4 are both in a weak inversion region;

[0016] The gate terminal of the third N-type switch tube M3 is connected between the source terminal of the first N-type switch tube M1 and the negative feedback inductor LS, the source terminal of the third N-type switch tube M3 is grounded, the drain terminal of the third N-type switch tube M3 is connected to the source terminal of the fourth N-type switch tube M4, and the drain terminal of the fourth N-type switch tube M4 is connected between the drain terminal of the first N-type switch tube M1 and the source terminal of the second N-type switch tube M2.

[0017] In addition to or as an alternative to one or more features disclosed above, the invention further comprises a bias unit having a first transmission end, a second transmission end, a third transmission end and a fourth transmission end;

[0018] The first transmission end is connected to the gate end of the first N-type switch tube M1, and is used to control the voltage of the gate end of the first N-type switch tube M1;

[0019] The second transmission end is connected to the gate end of the second N-type switch tube M2, and is used to control the voltage of the gate end of the second N-type switch tube M2;

[0020] The third transmission end is connected to the gate end of the third N-type switch tube M3, and is used to control the voltage of the gate end of the third N-type switch tube M3;

[0021] The fourth transmission end is connected to the gate end of the fourth N-type switch tube M4 and is used to control the voltage of the gate end of the fourth N-type switch tube M4.

[0022] In addition to one or more of the features disclosed above, or as an alternative, the gain unit also includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected between the first output terminal and the gate terminal of the first N-type switch tube M1, one end of the second capacitor C2 is connected between the connection path between the first transmission terminal and the gate terminal of the second N-type switch tube M2, and the other end is grounded.

[0023] In addition to one or more of the features disclosed above, or as an alternative, the correction unit also includes a third capacitor C3 and a fourth capacitor C4, the third capacitor C3 is connected between the source terminal of the first N-type switch tube M1 and the gate terminal of the third N-type switch tube M3, one end of the fourth capacitor C4 is connected between the connection path between the fourth transmission terminal and the gate terminal of the fourth N-type switch tube M4, and the other end is grounded.

[0024] In addition to one or more of the features disclosed above, or as an alternative, the input matching unit includes a first matching inductor Li n and a first matching capacitor Ci n, one end of the first matching inductor Li n is connected to the signal receiving end, and the other end is connected to the first output end, one end of the first matching capacitor Ci n is connected between the first matching inductor Li n and the first output end, and the other end is grounded.

[0025] In addition to one or more of the features disclosed above, or as an alternative, the output matching unit includes a second matching inductor L7, a third matching inductor Ld, a second matching capacitor C6, and a third matching capacitor C5. The second matching capacitor C6 and the second matching inductor L7 are connected in series between the drain end of the second N-type switch tube M2 and the output end of the amplifier circuit. One end of the third matching inductor Ld is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6. One end of the third matching capacitor C5 is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6.

[0026] On the other hand, an electronic device is provided, comprising any amplifying circuit disclosed above.

[0027] One of the above technical solutions has the following advantages or beneficial effects: after the first signal is transconductance amplified by the gain unit to generate the second signal, the second signal includes a linear component and a nonlinear component, the linear component is a component proportional to the first signal, and the nonlinear component is a distorted signal introduced during transconductance amplification. In order to improve the linearity of the amplifier circuit, reduce signal distortion, and improve communication quality, the present application introduces a correction unit, which generates a compensation signal after performing negative transconductance compensation on the first signal. The compensation signal includes a nonlinear component, and the electrical properties of the compensation signal and the second signal are opposite. After the compensation signal is input to the gain unit, it is superimposed with the second signal, and after eliminating the distorted part in the second signal, it is further amplified to generate a third signal, so that the third signal has a higher linearity while maintaining a high gain. Such a design can avoid the situation where the signal transmission bandwidth is limited due to excessive gain. Furthermore, by optimizing the energy transfer efficiency between the signal source and the gain unit through the input matching unit, and optimizing the energy transfer between the gain unit and the load through the output matching unit, the amplifier circuit can maintain good impedance matching over a wide bandwidth, reduce signal loss, and improve signal transmission efficiency.

[0028] In summary, the technical solution disclosed in the present application can significantly improve the bandwidth and linearity of the amplifier circuit without compromising other performance indicators of the amplifier circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the structure of an amplifier circuit provided in an embodiment of the present application. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of an amplifier circuit provided in an embodiment of the present application. Figure 2 ;

[0032] Figure 3 is an equivalent circuit diagram of an amplifier circuit provided in an embodiment of the present application;

[0033] Figure 4 It is a gain performance diagram of an amplifier circuit simulation provided in an embodiment of the present application.

[0034] Figure 5 This is an input impedance matching performance diagram of an amplifier circuit simulation provided in an embodiment of the present application.

[0035] Figure 6 This is a noise performance diagram of an amplifier circuit simulation provided in an embodiment of the present application.

[0036] Figure 7 It is a linear optimization performance diagram of an amplifier circuit simulation provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 100. Input matching unit;

[0039] 200, gain unit;

[0040] 300, calibration unit;

[0041] 400, output matching unit

[0042] 500. Bias unit. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and beneficial effects of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present invention, not for limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] The embodiment of the present invention discloses an amplifier circuit, referring to Figure 1, the amplifier circuit includes: an input matching unit 100, a gain unit 200, a correction unit 300 and an output matching unit 400. The input matching unit 100 is used to match the impedance between the input end of the gain unit 200 and the signal source, so as to perform impedance matching processing on the received first signal. The correction unit 300 receives the first signal passing through the gain unit 200 through the gain unit 200, and performs negative transconductance compensation on the first signal to generate a compensation signal. The gain unit 200 is used to receive the first signal output by the input matching unit 100 after impedance matching, and perform transconductance amplification on the first signal to generate a second signal; the gain unit 200 also receives the compensation signal, superimposes the compensation signal and the second signal and generates an output third signal, and the electrical properties of the compensation signal and the second signal are opposite. The output matching unit 400 is used to match the impedance between the output end of the gain unit 200 and the load, so as to perform impedance matching processing on the received third signal, and output the third signal after impedance matching processing.

[0048] After the gain unit 200 performs transconductance amplification on the first signal to generate the second signal, the second signal includes a linear component and a nonlinear component. The linear component is a component proportional to the first signal, and the nonlinear component is a distorted signal introduced during transconductance amplification. In order to improve the linearity of the amplifier circuit, reduce signal distortion, and improve communication quality, the present application introduces a correction unit 300. The correction unit 300 performs negative transconductance compensation on the first signal to generate a compensation signal. The compensation signal includes a nonlinear component, and the electrical properties of the compensation signal and the second signal are opposite. After the compensation signal is input to the gain unit 200, it is superimposed with the second signal, and after eliminating the distorted part in the second signal, it is further amplified to generate a third signal, so that the third signal has a higher linearity while maintaining a high gain. Such a design can avoid the situation where the signal transmission bandwidth is limited due to excessive gain. Furthermore, by optimizing the energy transfer efficiency between the signal source and the gain unit 200 through the input matching unit 100, and optimizing the energy transfer between the gain unit 200 and the load through the output matching unit 400, the amplifier circuit can maintain good impedance matching over a wide bandwidth, reduce signal loss, and improve signal transmission efficiency.

[0049] Specifically, refer to Figure 2The input matching unit 100 has a signal receiving end and a first input end. The signal receiving end is connected to the input end of the amplifier circuit and is used to receive a first signal, that is, a weak signal to be amplified in the form of voltage. The first output end is used to output the first signal after impedance matching. In some embodiments, the input matching unit 100 includes a first matching inductor Li n and a first matching capacitor Ci n. One end of the first matching inductor Li n is connected to the signal receiving end, and the other end is connected to the first output end. One end of the first matching capacitor Ci n is connected between the first matching inductor Li n and the first output end, and the other end is grounded. The first matching inductor Li n and the first matching capacitor Ci n form an LC matching network. In practical applications, the overall impedance characteristics of the input matching unit 100 can be adjusted by adjusting the parameters of the first matching inductor Li n and the first matching capacitor Ci n to adapt the output impedance of the signal source to the input impedance of the subsequent gain unit 200. At the same time, the first matching inductor Li n and the first matching capacitor Ci n can also perform bandpass filtering on the first signal, select the target frequency band signal transmission, and suppress unnecessary interference signals, reducing the impact of noise and unnecessary frequency components on the performance of subsequent gain unit 200 and correction unit 300.

[0050] Further, the gain unit 200 amplifies the first signal through the first N-type switch tube M1 and the second N-type switch tube M2. Specifically, the first N-type switch tube M1 and the second N-type switch tube M2 are both in the saturation region, the gate terminal of the first N-type switch tube M1 is connected to the first output terminal to receive the first signal, the source terminal of the first N-type switch tube M1 is grounded, the drain terminal of the first N-type switch tube M1 is connected to the source terminal of the second N-type switch tube M2, and the drain terminal of the second N-type switch tube M2 is connected to the input terminal of the output matching unit 400. The gate terminal of the first N-type switch tube M1 receives a first bias voltage to ensure that the first N-type switch tube M1 is in the saturation region, and the gate terminal of the second N-type switch tube M2 receives a second bias voltage to ensure that the second N-type switch tube M2 is in the saturation region. The correction unit 300 includes a third N-type switch tube M3 and a fourth N-type switch tube M4, and the third N-type switch tube M3 and the fourth N-type switch tube M4 are both in the weak inversion region. The gate terminal of the third N-type switch tube M3 is connected between the source terminal of the first N-type switch tube M1 and the negative feedback inductor LS, and is used to receive the first signal after passing through the first N-type switch tube M1. The source terminal of the third N-type switch tube M3 is grounded, and the drain terminal of the third N-type switch tube M3 is connected to the source terminal of the fourth N-type switch tube M4. The drain terminal of the fourth N-type switch tube M4 is connected between the drain terminal of the first N-type switch tube M1 and the source terminal of the second N-type switch tube M2.

[0051] The first N-type switch tube M1 and the second N-type switch tube M2 together form a first common source and common gate structure, wherein the first N-type switch tube M1 is a common source structure, and the second N-type switch tube M2 is a common gate structure. The first N-type switch tube M1 and the second N-type switch tube M2 are both in the saturation region, and the first signal is input from the gate end of the first N-type switch tube M1 to the gain unit 200 in the form of voltage. The first N-type switch tube M1 converts the input first signal in the form of voltage into a second signal in the form of current, thereby completing transconductance amplification in the first N-type switch tube M1. The second signal formed after transconductance amplification by the first N-type switch tube M1 is output from the drain end of the first N-type switch tube M1, which contains both linear components and nonlinear components. The nonlinear components are high-order harmonic components, which will affect the linearity of the output of the amplifier circuit. In order to offset the nonlinear component generated by the first N-type switch tube M1, the present application connects a third N-type switch tube M3 and a fourth N-type switch tube M4 in parallel between the source terminal and the drain terminal of the first N-type switch tube M1, and the third N-type switch tube M3 and the fourth N-type switch tube M4 together constitute a second common source and common gate structure, wherein the third N-type switch tube M3 is a common source structure, and the fourth N-type switch tube M4 is a common gate structure. The third N-type switch tube M3 and the fourth N-type switch tube M4 are both in a weak inversion region, and after the gate terminal of the third N-type switch tube M3 receives the first signal passing through the first N-type switch tube M1, the response to the signal is very sensitive, and under the transconductance of the third N-type switch tube M3, the drain terminal of the third N-type switch tube M3 can output a high-order harmonic component, i.e., a nonlinear component, and the nonlinear component is input to the source terminal of the second N-type switch tube M2 in the form of a compensation signal (the compensation signal is also a current signal) after passing through the drain terminal of the fourth N-type switch tube M4. At the source end of the second N-type switch tube M2, the second signal and the compensation signal are superimposed. The electrical property of the compensation signal is opposite to that of the second signal, and the nonlinear component in the second signal is offset. After the nonlinear component in the second signal is offset, it enters the second N-type switch tube M2, is further amplified by the second N-type switch tube M2, and is output in the form of a third signal.

[0052] It is worth mentioning that the gain unit 200 and the correction unit 300 disclosed above also have a high reverse isolation, and there is almost no signal coupling and interference between the input end of the gain unit 200 (i.e., the gate end of the first N-type switch tube M1) and the output end of the gain unit 200 (i.e., the drain end of the second N-type switch tube M2), so that the input signal and the output signal will not interfere with each other, and the same is true for the correction unit 300. Such a design can enhance the stability and isolation of the amplifier circuit, prevent oscillation and interference, and improve the integrity of the transmission signal. In addition, the conductivity of the third N-type switch tube M3 and the fourth N-type switch tube M4 in the weak inversion region is low, and the current flowing through is very small, so when generating the compensation signal, it will not generate too much interference and noise, and will not affect the gain unit 200. Therefore, the linearity of the amplifier can be significantly improved without damaging the noise coefficient of the amplifier circuit.

[0053] It should be noted that when analyzing the linear performance of the amplifier circuit disclosed in the present application, the amplifier circuit disclosed in the present application can be simplified as follows: Figure 3 The equivalent circuit shown. Specifically, the equivalent transconductance of the first cascode structure composed of the first N-type switch tube M1 and the second N-type switch tube M2 in the saturation region is approximately equal to the transconductance of the first N-type switch tube M1, and the nonlinear component is introduced by the first N-type switch tube M1. The equivalent transconductance of the second cascode structure composed of the third N-type switch tube M3 and the fourth N-type switch tube M4 in the weak inversion region is approximately equal to the transconductance of the third N-type switch tube M3, and the fourth N-type switch tube M4 is close to an open circuit state and will not affect the load of the gain unit 200. For linear performance analysis, the gain unit 200 in the simplified circuit can be equivalent to the gate-source parasitic capacitance Cgs1 of the first N-type switch tube M1, and the correction unit 300 can be equivalent to the gate-source parasitic capacitance Cgs3 of the third N-type switch tube M3. The total current Itotal output in the simplified circuit is equal to the sum of the output current of the gain unit 200 and the current output by the correction unit 300.

[0054] In some embodiments, the source terminal of the first N-type switch tube M1 is connected to the ground through a negative feedback inductor LS. The negative feedback inductor LS can provide a virtual resistance component for the gate terminal of the first N-type switch tube M1 that does not add additional noise, thereby reducing the noise caused by source current fluctuations, while effectively filtering out unwanted high-frequency noise signals and reducing the noise of the amplifier circuit.

[0055] In order to control the first N-type switch tube M1 and the second N-type switch tube M2 to work in the saturation region and the third N-type switch tube M3 and the fourth N-type switch tube M4 to work in the weak inversion region, the amplifier circuit disclosed in the present application also includes a bias unit 500, which has a first transmission end, a second transmission end, a third transmission end and a fourth transmission end. The first transmission end is connected to the gate end of the first N-type switch tube M1, and is used to control the voltage of the gate end of the first N-type switch tube M1; the second transmission end is connected to the gate end of the second N-type switch tube M2, and is used to control the voltage of the gate end of the second N-type switch tube M2; the third transmission end is connected to the gate end of the third N-type switch tube M3, and is used to control the voltage of the gate end of the third N-type switch tube M3; the fourth transmission end is connected to the gate end of the fourth N-type switch tube M4, and is used to control the voltage of the gate end of the fourth N-type switch tube M4.

[0056] Furthermore, the gain unit 200 also includes a first capacitor C1 and a second capacitor C2, wherein the first capacitor C1 is connected between the first output terminal and the gate terminal of the first N-type switch tube M1, and one end of the second capacitor C2 is connected between the connection path between the first transmission terminal and the gate terminal of the second N-type switch tube M2, and the other end is grounded. The first capacitor C1 can prevent the DC bias in the signal output by the input impedance matching unit from directly affecting the bias voltage of the first N-type switch tube M1. The second capacitor C2 can lead the high-frequency component of the AC signal received by the gate terminal of the second N-type switch tube M2 to the ground to prevent high-frequency noise or interference signals from being superimposed on the bias voltage of the second N-type switch tube M2, thereby stabilizing the gate voltage of the second N-type switch tube M2 and reducing the influence of noise interference on circuit performance.

[0057] Similarly, the correction unit 300 also includes a third capacitor C3 and a fourth capacitor C4, the third capacitor C3 is connected between the source terminal of the first N-type switch tube M1 and the gate terminal of the third N-type switch tube M3, one end of the fourth capacitor C4 is connected between the connection path of the fourth transmission terminal and the gate terminal of the fourth N-type switch tube M4, and the other end is grounded. The third capacitor C3 can prevent the DC bias at the source terminal of the first N-type switch tube M1 from directly affecting the bias voltage of the gate terminal of the third N-type switch tube M3. The fourth capacitor C4 can lead the high-frequency component of the AC signal received at the gate terminal of the fourth N-type switch tube M4 to the ground to prevent high-frequency noise or interference signals from being superimposed on the bias voltage of the fourth N-type switch tube M4, so that the gate voltage of the fourth N-type switch tube M4 can be stabilized and the influence of noise interference on circuit performance can be reduced.

[0058] The output matching unit 400 includes a second matching inductor L7, a third matching inductor Ld, a second matching capacitor C6, and a third matching capacitor C5. The second matching capacitor C6 and the second matching inductor L7 are connected in series between the drain end of the second N-type switch tube M2 and the output end of the amplifier circuit. One end of the third matching inductor Ld is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6. One end of the third matching capacitor C5 is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6. The second matching inductor L7 and the second matching capacitor C6 form a series resonant network to adjust the impedance characteristics of the output end of the amplifier circuit, ensure that the output third signal can be efficiently transmitted to the subsequent circuit (or load), and improve the power transmission efficiency of the output signal within the target frequency range. Moreover, within the target operating frequency range (for example, 3.3GHz to 4.2GHz), the second matching inductor L7 and the second matching capacitor C6 can resonate, selectively enhance the frequency components within the signal bandwidth, and suppress interference from other frequencies. The third matching inductor Ld can improve the output efficiency and power gain of the amplifier circuit by adjusting the load impedance at the drain end of the second N-type switch tube M2. The third matching capacitor C5 can realize the decoupling function of the high-frequency signal by providing a low-impedance path to introduce the high-frequency noise component into the ground, thereby eliminating the high-frequency interference in the output signal.

[0059] Furthermore, the index for measuring the linearity of the amplifier circuit is I IP3 (third-order intermodulation intercept point), and the I IP3 in the technical solution disclosed in the present application can be derived by using the Volterra series.

[0060]

[0061] Among them, the larger the I IP3, the higher the linearity, g m is the transconductance of the gain unit 200, which is an important parameter of the linear amplification capability in the circuit. ∈: nonlinear coefficient, which characterizes the nonlinear distortion characteristics of the circuit. Z1(s): input impedance of the circuit. A1(s): gain factor of the third-order harmonic component. 6: correction factor, which comes from the normalization of high-order harmonic components in the derivation of Volterra series. It can be seen from the formula of I IP3 that the size of I IP3 is determined by g m Determined by the relationship between ∈, Z1(s), and A4(s). High g m The linear gain capability is improved, and low ∈ and small A4(s) can reduce the linear distortion of the amplifier circuit across the group and improve the linearity. The present application improves the transconductance of the gain unit 200 through the first N-type switch tube M1 and the second N-type switch tube M2, and improves the linear gain capability of the amplifier circuit.

[0062] Furthermore, ∈ = g 3m -g 2m2 / 3g 1m +g 3a n(s)|n(s)2,g 1m ,g 2m ,g 3m represents the linear, first-order and third-order transconductance characteristics of the gain unit 200, g 3a : The third-order transconductance component of the correction unit 300 plays a role in compensating nonlinearity (affected by the bias voltage at the gate end of the third N-type switch tube M3), n(s): The characteristic function calculated by the input signal and circuit parameters, reflecting the influence of impedance, gain, and parasitic capacitance on the nonlinearity of the system. n(s)=sLs(g 1m +sC gs1 ) / 1+s 2 C gs3 L s . It can be seen that the g of the gain unit 200 1m ,g 2m ,g 3m The linear and nonlinear relationship of the cross-group amplifier circuit is determined, and the correction unit 300 can efficiently compensate for the nonlinear type through g3a. That is, the present application can correct the distortion part of the gain unit 200 during the amplification process through the correction unit 300. Figure 4-Figure 7 As an example, the simulation results of Figure 4 This is a gain performance diagram of the amplifier circuit disclosed in this application when transmitting a signal in the n77 frequency band (3.3 GHz to 4.2 GHz), Figure 4 It shows that the gain of the amplifier circuit disclosed in the present application is relatively stable, and has good gain performance in the range of 20-21.5dB, and can stably amplify the input signal. Figure 5 This is the input impedance matching performance diagram of the amplifier circuit disclosed in the present application. In the broadband range, especially at the sideband frequencies of 3.4 GHz and 4.1 GHz, the impedance matching performance is good (S11 is less than -6 dB), indicating that the input end reflection loss of the amplifier circuit disclosed in the present application is small. And the voltage standing wave ratio (VSWR) is less than 1.65, indicating that the amplifier circuit disclosed in the present application has a good matching effect, can reduce signal reflection, and improve energy transfer efficiency. Figure 6 The noise figure shown is less than 1.15dB. Figure 6 This is a noise performance diagram of the amplifier circuit disclosed in the present application. The noise coefficient is less than 1.15dB, indicating that the amplifier circuit disclosed in the present application has low noise characteristics within the entire bandwidth, which helps to improve the signal-to-noise ratio (SNR) after signal amplification and is suitable for use in high-performance communication systems. Figure 7This is a linear optimization performance diagram of the amplifier circuit disclosed in the present application, showing the changes in the third-order intermodulation intercept point (I IP3) and the bias voltage Vb3 of the third N-type switch tube M3. The larger the I IP3, the better the linearity of the amplifier. When Vb3 is close to the threshold voltage (about 0.3V) of the third N-type switch tube M3, I IP3 reaches the optimal value. This shows that the present application sets the operating voltage of the third N-type switch tube M3 in the weak inversion region, which can generate a compensation signal opposite to the nonlinear component of the gain unit 200, thereby minimizing linear distortion.

[0063] At least one embodiment of the present application further provides an electronic device, which includes any amplifying circuit disclosed above.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An amplifier circuit, characterized in that: include: An input matching unit, a gain unit, a correction unit, and an output matching unit; The input matching unit is used to match the impedance between the input end of the gain unit and the signal source, and the input matching unit has a signal receiving end and a first output end, the signal receiving end is used to receive the first signal, and the first output end is used to output the first signal after impedance matching; The correction unit receives the first signal passing through the gain unit through the gain unit, and performs negative transconductance compensation on the first signal to generate a compensation signal, wherein the compensation signal includes a nonlinear component; The gain unit receives the impedance-matched first signal output by the input matching unit, and performs transconductance amplification on the first signal to generate a second signal; receives the compensation signal, superimposes the compensation signal and the second signal, and further amplifies the signal to generate and output a third signal, wherein the electrical properties of the compensation signal and the second signal are opposite; The output matching unit is used to match the impedance between the output end of the gain unit and the load, so as to perform impedance matching processing on the received third signal, and output the third signal after the impedance matching processing; The first signal is a weak signal to be amplified in the form of voltage, and the second signal, the compensation signal and the third signal are all in the form of current.

2. The amplifier circuit according to claim 1, characterized in that: The gain unit includes a first N-type switch tube M1 and a second N-type switch tube M2, and the first N-type switch tube M1 and the second N-type switch tube M2 are both in a saturation region; The gate terminal of the first N-type switch tube M1 is connected to the first output terminal, the source terminal of the first N-type switch tube M1 is grounded, the drain terminal of the first N-type switch tube M1 is connected to the source terminal of the second N-type switch tube M2, and the drain terminal of the second N-type switch tube M2 is connected to the input terminal of the output matching unit.

3. The amplifier circuit according to claim 2, characterized in that: A source terminal of the first N-type switch tube M1 is connected to the ground through a negative feedback inductor LS.

4. The amplifier circuit according to claim 3, characterized in that: The correction unit includes a third N-type switch tube M3 and a fourth N-type switch tube M4, and the third N-type switch tube M3 and the fourth N-type switch tube M4 are both in a weak inversion region; The gate terminal of the third N-type switch tube M3 is connected between the source terminal of the first N-type switch tube M1 and the negative feedback inductor LS, the source terminal of the third N-type switch tube M3 is grounded, the drain terminal of the third N-type switch tube M3 is connected to the source terminal of the fourth N-type switch tube M4, and the drain terminal of the fourth N-type switch tube M4 is connected between the drain terminal of the first N-type switch tube M1 and the source terminal of the second N-type switch tube M2.

5. The amplifier circuit according to claim 4, characterized in that: Also included is a bias unit, the bias unit having a first transmission end, a second transmission end, a third transmission end and a fourth transmission end; The first transmission end is connected to the gate end of the first N-type switch tube M1, and is used to control the voltage of the gate end of the first N-type switch tube M1; The second transmission end is connected to the gate end of the second N-type switch tube M2, and is used to control the voltage of the gate end of the second N-type switch tube M2; The third transmission end is connected to the gate end of the third N-type switch tube M3, and is used to control the voltage of the gate end of the third N-type switch tube M3; The fourth transmission end is connected to the gate end of the fourth N-type switch tube M4 and is used to control the voltage of the gate end of the fourth N-type switch tube M4.

6. The amplifier circuit according to claim 5, characterized in that: The gain unit also includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected between the first output end and the gate end of the first N-type switch tube M1, one end of the second capacitor C2 is connected between the connection path between the first transmission end and the gate end of the second N-type switch tube M2, and the other end is grounded.

7. The amplifier circuit according to claim 5, characterized in that: The correction unit also includes a third capacitor C3 and a fourth capacitor C4, the third capacitor C3 is connected between the source terminal of the first N-type switch tube M1 and the gate terminal of the third N-type switch tube M3, one end of the fourth capacitor C4 is connected between the connection path between the fourth transmission terminal and the gate terminal of the fourth N-type switch tube M4, and the other end is grounded.

8. The amplifier circuit according to claim 1, characterized in that: The input matching unit includes a first matching inductor Lin and a first matching capacitor Cin, one end of the first matching inductor Lin is connected to the signal receiving end, and the other end is connected to the first output end, one end of the first matching capacitor Cin is connected between the first matching inductor Lin and the first output end, and the other end is grounded.

9. The amplifier circuit according to claim 1, characterized in that: The output matching unit includes a second matching inductor L7, a third matching inductor Ld, a second matching capacitor C6, and a third matching capacitor C5. The second matching capacitor C6 and the second matching inductor L7 are connected in series between the drain end of the second N-type switch tube M2 and the output end of the amplifier circuit. One end of the third matching inductor Ld is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6. One end of the third matching capacitor C5 is grounded, and the other end is connected between the drain end of the second N-type switch tube M2 and the second matching capacitor C6.

10. An electronic device, characterized in that: Includes any amplifier circuit described in rights 1-9.

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