Signal amplification circuit, communication device, and electronic apparatus
By combining the circuit structure of variable gain amplifier, voltage follower and gain adjustment module, the resistance limitation of traditional variable gain amplifiers is broken through, signal amplification with greater gain is achieved, and hardware circuits of electronic products are simplified.
Patent Information
- Application Number
- CN202510431332.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2025-07-29
AI Technical Summary
The maximum gain of traditional variable gain amplifiers is limited by the resistor itself, making it difficult to achieve large numerical gain stably. The cascade of multi-stage amplifiers leads to complex hardware circuit structure and slowing down the gain growth rate.
The combined circuit structure of a variable gain amplifier, a first voltage follower, a second voltage follower and a gain adjustment module is adopted to achieve greater gain by adjusting the equivalent resistance value, and the circuit structure is simplified.
The gain of a single-stage signal amplifier circuit exceeds that of a multi-stage traditional variable gain amplifier is realized, which simplifies the hardware circuit structure, reduces the difficulty of design and production, and promotes the miniaturization of electronic products.
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Figure CN120389710A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic and electrical technologies, and in particular, to a signal amplification circuit, a communication device, and an electronic device. Background Art
[0002] A variable-gain amplifier (English: variable-gain amplifier, abbreviated as VGA) is an amplifier with controllable gain and is commonly used as part of a closed-loop control circuit to maintain the consistency of the signal power level in the main signal path. For example, a variable-gain amplifier can use voltage control as the input of the amplifier feedback network, and then the feedback network adjusts the gain of the amplifier. However, the maximum gain of a traditional variable-gain amplifier is determined by the ratio between internal resistors, limited by the maximum and minimum resistor values of the resistor itself and the process error of the resistor value. It is difficult to stably achieve a large amplifier gain through a single variable-gain amplifier. A large amplifier gain can only be achieved through cascading multiple amplifiers (that is, the output signal of the previous-stage amplifier is used as the input signal of the next-stage amplifier to achieve multi-stage amplification). In the cascading case, the growth rate of the gain gradually decreases as the number of cascades increases, resulting in a complex hardware circuit structure and limited effect of increasing the gain. Summary of the Invention
[0003] This application provides a signal amplification circuit, a communication device, and an electronic device, which can help improve the maximum gain of the signal amplification circuit.
[0004] This application provides a signal amplification circuit, which includes a variable-gain amplifier, a first voltage follower, a second voltage follower, and a gain adjustment module;
[0005] The positive input terminal of the variable-gain amplifier is connected to the positive input terminal of the signal amplification circuit, and the negative input terminal of the variable-gain amplifier is connected to the negative input terminal of the signal amplification circuit;
[0006] The input terminal of the first voltage follower is connected to the positive output terminal of the variable-gain amplifier, and the output terminal of the first voltage follower is connected to the positive output terminal of the signal amplification circuit;
[0007] The input terminal of the second voltage follower is connected to the negative output terminal of the variable-gain amplifier, and the output terminal of the second voltage follower is connected to the negative output terminal of the signal amplification circuit;
[0008] The gain adjustment module is respectively connected to a power supply voltage line, an adjustment signal input terminal, and the positive input terminal and the negative input terminal of the variable gain amplifier. The gain adjustment module is configured to adjust the resistance value of a first equivalent resistor and the resistance value of a second equivalent resistor according to the voltage value of the adjustment signal provided by the adjustment signal input terminal. The first equivalent resistor is the equivalent resistor of the gain adjustment module between the power supply voltage line and the positive output terminal of the variable gain amplifier, and the second equivalent resistor is the equivalent resistor of the gain adjustment module between the power supply voltage line and the negative output terminal of the variable gain amplifier.
[0009] In some possible implementation manners, the gain adjustment module includes a first transistor and a second transistor. The adjustment signal input terminal includes a first input terminal. The gate of the first transistor is connected to the first input terminal. The first pole of the first transistor is connected to the power supply voltage line. The second pole of the first transistor is connected to the positive output terminal of the variable gain amplifier. The gate of the second transistor is connected to the first input terminal. The first pole of the second transistor is connected to the power supply voltage line. The second pole of the second transistor is connected to the negative output terminal of the variable gain amplifier.
[0010] In some possible implementation manners, the adjustment signal input terminal further includes a second input terminal. The gain adjustment module further includes:
[0011] A third transistor spaced between the second pole of the first transistor and the positive output terminal of the variable gain amplifier. The gate of the third transistor is connected to the second input terminal. The first pole of the third transistor is connected to the second pole of the first transistor. The second pole of the third transistor is connected to the positive output terminal of the variable gain amplifier; and,
[0012] A fourth transistor spaced between the second pole of the second transistor and the negative output terminal of the variable gain amplifier. The gate of the fourth transistor is connected to the second input terminal. The first pole of the fourth transistor is connected to the second pole of the second transistor. The second pole of the fourth transistor is connected to the negative output terminal of the variable gain amplifier.
[0013] In some possible implementation manners, the first voltage follower includes a fifth transistor. The gate of the fifth transistor is connected to the positive output terminal of the variable gain amplifier. The first pole of the fifth transistor is connected to the power supply voltage line. The second pole of the fifth transistor is connected to the positive output terminal of the signal amplification circuit. The second voltage follower includes a sixth transistor. The gate of the sixth transistor is connected to the negative output terminal of the variable gain amplifier. The first pole of the sixth transistor is connected to the power supply voltage line. The second pole of the sixth transistor is connected to the negative output terminal of the signal amplification circuit.
[0014] In some possible implementations, the variable gain amplifier includes a seventh transistor, an eighth transistor, a first current source, a second current source, and a first resistor; wherein,
[0015] The gate of the seventh transistor is connected to the positive input terminal of the variable gain amplifier, the first pole of the seventh transistor is respectively connected to the positive pole of the first current source and the first end of the first resistor, and the second pole of the seventh transistor is connected to the positive output terminal of the variable gain amplifier;
[0016] The gate of the eighth transistor is connected to the negative input terminal of the variable gain amplifier, the first pole of the eighth transistor is respectively connected to the positive pole of the second current source and the second end of the first resistor, and the second pole of the eighth transistor is connected to the negative output terminal of the variable gain amplifier;
[0017] The negative poles of the first current source and the second current source are both connected to the common terminal of the signal amplification circuit.
[0018] In some possible implementations, the gain Av of the signal amplification circuit is configured and implemented by the following formula:
[0019]
[0020] where, R A = gm1 × r1 × R D and, R B = gm2 × r2 × r3, gm1 is the transconductance value of the seventh transistor and the eighth transistor, R D is half of the resistance value of the first resistor, gm2 is the transconductance value of the third transistor and the fourth transistor, r1 is the source-drain equivalent resistance of the seventh transistor and the eighth transistor, r2 is the source-drain equivalent resistance of the third transistor and the fourth transistor, and r3 is the source-drain equivalent resistance of the first transistor and the second transistor.
[0021] In some possible implementations, the first transistor and the second transistor have the same device specifications, the third transistor and the fourth transistor have the same device specifications, the fifth transistor and the sixth transistor have the same device specifications, and the seventh transistor and the eighth transistor have the same device specifications.
[0022] The present application also provides a communication device, and the communication device includes the signal amplification circuit of any one of the above.
[0023] In some possible implementations, the communication device is at least one of a signal transceiver device, a signal receiving device, a signal transmitting device, and a signal modulation device.
[0024] The present application also provides an electronic device, and the electronic device includes the communication device of any one of the above.
[0025] In the signal amplification circuit of the embodiment of the present application, the positive output terminal and the negative output terminal of the variable gain amplifier are respectively connected to the positive output terminal and the negative output terminal of the signal amplifier via a first voltage follower and a second voltage follower, and the gain adjustment module can adjust the equivalent resistance of the positive output terminal and the negative output terminal of the variable gain amplifier to the power supply voltage line under the control of an adjustment signal. In this way, the large resistance value originally provided by a hardware resistor in the gain expression of the signal amplification circuit is provided by the parallel connection of the above equivalent resistance, the internal resistance of the variable gain amplifier, and the resistance between the input terminal and the output terminal of the voltage follower. In this way, the limitation of the maximum resistance value of the resistor itself can be broken through, so that the signal amplification circuit has a greater gain than a traditional variable gain amplifier. Therefore, a single-stage signal amplification circuit can achieve the gain that can only be achieved by cascading multiple traditional variable gain amplifiers, which helps to simplify the hardware circuit structure of related electronic products.
[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.
[0028] Figure 1 is a structural block diagram of a signal amplification circuit provided by an embodiment of the present application;
[0029] Figure 2 is a schematic circuit structure diagram of a signal amplification circuit provided by an embodiment of the present application;
[0030] Figure 3 is a schematic circuit structure diagram of a variable gain amplifier provided by an embodiment of the present application;
[0031] Figure 4 is a structural block diagram of a communication device provided by an embodiment of the present application;
[0032] Figure 5 is a structural block diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.
[0034] The terms used in the embodiments section of this disclosure are only for explaining the embodiments of this disclosure and are not intended to limit this disclosure. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The words "first", "second", "third" and similar terms used in the specification and claims of this patent application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
[0035] Figure 1 is a structural block diagram of a signal amplification circuit provided by an embodiment of this application. Refer to Figure 1 , this signal amplification circuit has a positive input terminal A1, a negative input terminal A0, a positive output terminal D1 and a negative output terminal D0, and includes a variable gain amplifier 11, a first voltage follower 12, a second voltage follower 13 and a gain adjustment module 14. As Figure 1 shown, the positive input terminal B1 of the variable gain amplifier 11 is connected to the positive input terminal A1 of the signal amplification circuit, and the negative input terminal B0 of the variable gain amplifier 11 is connected to the negative input terminal A0 of the signal amplification circuit; the input terminal of the first voltage follower 12 is connected to the positive output terminal C1 of the variable gain amplifier 11, and the output terminal of the first voltage follower 12 is connected to the positive output terminal D1 of the signal amplification circuit; the input terminal of the second voltage follower 13 is connected to the negative output terminal C0 of the variable gain amplifier 11, and the output terminal of the second voltage follower 13 is connected to the negative output terminal D0 of the signal amplification circuit; the gain adjustment module 14 is respectively connected to the power supply voltage line VD, the adjustment signal input terminal ST, and the positive input terminal B1 and the negative input terminal of the variable gain amplifier 11. The gain adjustment module 14 is configured to adjust the resistance value of the first equivalent resistance and the resistance value of the second equivalent resistance according to the voltage value of the adjustment signal provided by the adjustment signal input terminal ST, where the first equivalent resistance is the equivalent resistance of the gain adjustment module 14 between the power supply voltage line VD and the positive output terminal C1 of the variable gain amplifier 11, and the second equivalent resistance is the equivalent resistance of the gain adjustment module 14 between the power supply voltage line VD and the negative output terminal C0 of the variable gain amplifier 11.
[0036] It should be noted that the variable gain amplifier 11 can adopt, for example, the circuit structure of a variable gain amplifier (VGA) known in any relevant technology, which has two positive and negative input terminals and two positive and negative output terminals and is used to amplify the signal between the two input terminals and output it between the two output terminals. Specific exemplary circuit structures will be given later; the first voltage follower 12 and the second voltage follower 13 can adopt, for example, the circuit structures known in any relevant technology that can make the output terminal voltage value linearly positively correlated with the input terminal voltage value, and specific exemplary circuit structures will be given later; the gain adjustment module 14 can adopt, for example, the circuit structures known in any relevant technology with the above functions, and specific exemplary circuit structures will be given later.
[0037] Based on the above circuit structure, the signal amplification circuit can have a greater gain than traditional variable gain amplifiers. In this signal amplification circuit, the positive output terminal C1 and the negative output terminal C0 of the variable gain amplifier 11 are respectively connected to the positive output terminal D1 and the negative output terminal D0 of the signal amplifier via the first voltage follower 12 and the second voltage follower 12, and the gain adjustment module 14 can adjust the equivalent resistances of the positive output terminal C1 and the negative output terminal C0 of the variable gain amplifier 11 to the power supply voltage line VD under the control of the adjustment signal. In this way, the large resistance value originally required by the hardware resistor in the gain expression of the signal amplification circuit is provided by the parallel connection of the above equivalent resistance, the internal resistance of the variable gain amplifier, and the resistance between the input terminal and the output terminal of the voltage follower. In this way, the limitation of the maximum resistance value of the resistor itself can be broken through, so that the signal amplification circuit has a greater gain than traditional variable gain amplifiers, and thus a single-stage signal amplification circuit can achieve the gain that can only be achieved by cascading multiple traditional variable gain amplifiers, which helps to simplify the hardware circuit structure of related electronic products.
[0038] Figure 2 It is a schematic diagram of the circuit structure of a signal amplification circuit provided by an embodiment of the present application.
[0039] See Figure 2 , as an exemplary circuit structure of a variable gain amplifier 11, the variable gain amplifier 11 includes a seventh transistor T7, an eighth transistor T8, a first current source E1, a second current source E2, and a first resistor RD. As Figure 2As shown, the gate of the seventh transistor T7 is connected to the positive input terminal B1 of the variable gain amplifier 11. The first pole of the seventh transistor T7 is respectively connected to the positive pole of the first current source E1 and the first end of the first resistor RD. The second pole of the seventh transistor T7 is connected to the positive output terminal C1 of the variable gain amplifier 11. The gate of the eighth transistor T8 is connected to the negative input terminal B0 of the variable gain amplifier 11. The first pole of the eighth transistor T8 is respectively connected to the positive pole of the second current source E2 and the second end of the first resistor RD. The second pole of the eighth transistor T8 is connected to the negative output terminal C0 of the variable gain amplifier 11. The negative poles of the first current source E1 and the second current source E2 are both connected to the common terminal of the signal amplification circuit. It should be noted that the first pole and the second pole of the transistors described in this article refer to the two electrodes other than the gate. As an example, the first pole refers to the source electrode and the second pole refers to the drain electrode, or the first pole refers to the drain electrode and the second pole refers to the source electrode. Figure 2 Among them, the first current source E1 and the second current source E2 are both constant current sources, that is, power sources that provide a constant current value. The seventh transistor T7 and the eighth transistor T8 have the same device specifications (for example, they are mirror images of each other or have a symmetric structure). The first resistor RD can be, for example, a resistor with a fixed resistance value.
[0040] Based on the above circuit structure, the variable gain amplifier 11 can achieve the function of amplifying the differential signal between the two input terminals and outputting it between the two output terminals, and can control the amplification gain by controlling the outputs of the first current source E1 and the second current source E2.
[0041] Figure 3 It is a schematic diagram of the circuit structure of a variable gain amplifier provided by an embodiment of the present application. As a comparative example, Figure 2 The output terminals of the variable gain amplifier 11 shown are respectively connected to the power supply voltage line VD via the same resistor RL. According to the working principle of the VGA, it can be inferred that Figure 3 The gain of the variable gain amplifier shown is as follows:
[0042]
[0043] In this formula, gm1 is the transconductance value of the seventh transistor T7 and the eighth transistor T8, R D is half of the resistance value of the first resistor RD, and R L is the resistance value of the resistor RL.
[0044] Considering that generally the value of gm1×R D is much greater than 1, the above formula can be simplified to
[0045]
[0046] That is,Figure 3 The gain of the variable gain amplifier shown is generally determined by the resistance ratio between two resistors, namely resistor RL and the first resistor RD. From this formula, it can be seen that for a large numerical gain of the variable gain amplifier, resistor RL needs to have a sufficiently large resistance value and the first resistor RD needs to have a sufficiently small resistance value.
[0047] However, in the related art, the resistance values of resistor RL and the first resistor RD are restricted by various factors including process, materials, circuit compatibility, etc., such that the resistance value of resistor RL has an upper limit and the resistance value of the first resistor RD has a lower limit, and there are process and environmental errors in the resistance value of the resistor itself. Therefore, the numerical value and stable range of the gain are also affected, that is, it is impossible to stably achieve an amplifier gain exceeding the upper limit value by a single variable gain amplifier such as Figure 3 shown.
[0048] In order to implement a variable gain amplifier with a large numerical amplifier gain, the most commonly used method in the related art is to cascade multiple stages of variable gain amplifiers, that is, the output signal of the previous stage amplifier is used as the input signal of the next stage amplifier, so as to achieve multi-stage continuous amplification. However, in the case of cascading multiple stages of variable gain amplifiers, the growth rate of the gain gradually decreases as the number of cascaded stages increases. Therefore, a relatively large number of variable gain amplifiers often need to be cascaded, resulting in a complex hardware circuit structure and a limited effect of increasing the gain.
[0049] In this regard, taking the Figure 2 shown circuit structure as an example, the embodiments of the present application can break through the above limitations, enabling the signal amplification circuit to have a greater gain than the traditional variable gain amplifier.
[0050] Such as Figure 2As an example, the first voltage follower 12 includes a fifth transistor T5. The gate of the fifth transistor T5 is connected to the positive output terminal C1 of the variable gain amplifier 11. The first pole of the fifth transistor T5 is connected to the power supply voltage line VD. The second pole of the fifth transistor T5 is connected to the positive output terminal D1 of the signal amplification circuit. The second voltage follower 13 includes a sixth transistor T6. The gate of the sixth transistor T6 is connected to the negative output terminal C0 of the variable gain amplifier 11. The first pole of the sixth transistor T6 is connected to the power supply voltage line VD. The second pole of the sixth transistor T6 is connected to the negative output terminal D0 of the signal amplification circuit. The gain adjustment module 14 includes a first transistor T1, a second transistor T2, a third transistor T3, and a fourth transistor T4. The adjustment signal input terminal ST includes a first input terminal S1 and a second input terminal S2. The gate of the first transistor T1 is connected to the first input terminal S1. The first pole of the first transistor T1 is connected to the power supply voltage line VD. The second pole of the first transistor T1 is connected to the first pole of the third transistor T3. The gate of the third transistor T3 is connected to the second input terminal S2. The first pole of the third transistor T3 is connected to the second pole of the first transistor T1. The second pole of the third transistor T3 is connected to the positive output terminal C1 of the variable gain amplifier 11. The gate of the second transistor T2 is connected to the first input terminal S1. The first pole of the second transistor T2 is connected to the power supply voltage line VD. The second pole of the second transistor T2 is connected to the first pole of the fourth transistor T4. The gate of the fourth transistor T4 is connected to the second input terminal S2. The second pole of the fourth transistor T4 is connected to the negative output terminal C0 of the variable gain amplifier 11. Figure 2 Among them, the first transistor T1 and the second transistor T2 have the same device specifications (for example, they are mirror images of each other or have a symmetric structure). The third transistor T3 and the fourth transistor T4 have the same device specifications (for example, they are mirror images of each other or have a symmetric structure). The fifth transistor T5 and the sixth transistor T6 have the same device specifications (for example, they are mirror images of each other or have a symmetric structure).
[0051] Based on the above circuit structure, according to the working principle of the VGA, the expression of the gain Av of the signal amplification circuit can be deduced:
[0052]
[0053] Where, R A = gm1 × r1 × R D , R B = gm2 × r2 × r3, gm1 is the transconductance value of the seventh transistor T7 and the eighth transistor T8, R Dis half of the resistance value of the first resistor RD, gm2 is the transconductance value of the third transistor T3 and the fourth transistor T4, r1 is the source-drain equivalent resistance of the seventh transistor T7 and the eighth transistor T8, r2 is the source-drain equivalent resistance of the third transistor T3 and the fourth transistor T4, and r3 is the source-drain equivalent resistance of the first transistor T1 and the second transistor T2. It should be understood that the source-drain equivalent resistance refers to the resistance value externally presented between the source and the drain of the transistor in the current working state.
[0054] It should be noted that the premise for obtaining the above formula is that the equivalent resistance values of the first voltage follower 12 and the second voltage follower 13 are regarded as infinite. Therefore, in the above formula, it is represented as R A and R B The resistance value obtained after being connected in parallel should actually be connected in parallel with the resistance value of the voltage follower. However, since the resistance value formed when any resistor is connected in parallel with an infinite resistor is equal to the resistance value of the resistor itself, the equivalent resistance values of the first voltage follower 12 and the second voltage follower 13 do not appear in the above formula.
[0055] Compare Figure 3 the expression of the gain of the variable gain amplifier shown in Figure 2 with the expression of the gain of the signal amplification circuit shown in A and R B It can be seen that the resistance value obtained after being connected in parallel in the gain expression of the signal amplification circuit replaces the resistance value of the original resistor RL. Considering that for common transistors, the above R A and R B can be one to two orders of magnitude higher than the value of the resistor RL with a large resistance value. Therefore, Figure 2 the maximum gain of the signal amplification circuit shown in Figure 3 can be much higher than the maximum gain of the variable gain amplifier shown in Figure 2 This means that for a large numerical gain that previously required three, four, or more stages of variable gain amplifiers cascaded to achieve, only a single signal amplification circuit as shown in
[0056] In Figure 2Among them, the first voltage follower 12 and the second voltage follower 13 are each implemented by a transistor. In practical applications, through the selection of devices and / or the configuration of bias voltages, the operating points of the fifth transistor T5 and the sixth transistor T6 can be maintained in the linear region, so that the functions of the first voltage follower 12 and the second voltage follower 13 described above can be realized by utilizing the operating characteristics of the transistor in the linear region. Although other implementation methods of voltage followers can be selected according to actual application requirements, Figure 2 the example shown can have a simpler circuit structure compared to other implementation methods, which helps to further simplify the circuit structure.
[0057] In Figure 2 Among them, the gain adjustment module 14 is implemented by two sets of transistors. It mainly utilizes the characteristic that the source-drain equivalent resistance changes when the transistor switches between the cut-off region, the linear region, and the saturation region to realize the function of the above-mentioned gain adjustment module 14. In one example, the adjustment signal provided by the adjustment signal input terminal ST remains in a fixed state under normal operating conditions, so that the current source inside the variable gain amplifier 11 can change the amplification gain within the required range; while in cases where the amplification gain range of the signal amplification circuit needs to be changed during factory production, startup, initialization, reset, configuration, etc., the configuration of the adjustment signal provided to the adjustment signal input terminal ST can be set to change the amplification gain range that the variable gain amplifier 11 can change under normal operating conditions. For a circuit structure where the adjustment signal input terminal ST includes a first input terminal S1 and a second input terminal S2, the adjustment signals provided by the two input terminals can achieve flexible configuration of the amplification gain range in more dimensions and a larger range.
[0058] In another example, the setting of the third transistor T3 and the fourth transistor T4 in the gain adjustment module 14 can be omitted. At this time, the adjustment signal input terminal ST only includes the first input terminal S1. The gate of the first transistor T1 is connected to the first input terminal S1, the first pole of the first transistor T1 is connected to the power supply voltage line VD, and the second pole of the first transistor T1 is connected to the positive output terminal C1 of the variable gain amplifier 11. The gate of the second transistor T2 is connected to the first input terminal S1, the first pole of the second transistor T2 is connected to the power supply voltage line VD, and the second pole of the second transistor T2 is connected to the negative output terminal C0 of the variable gain amplifier 11. In this way, the function of the above-mentioned gain adjustment module 14 can be realized with a simpler circuit structure.
[0059] It should be noted that the signal amplification circuit may be, for example, a separate component installed in an electronic device or on a circuit board, or may form an integrated circuit board (such as a PCB board) together with other circuits, or may be a part of a circuit product with certain functions (in this case, the signal amplification circuit may share at least some circuit components with other circuit parts, and there may or may not be a clear area division between the signal amplification circuit and other circuit parts). The embodiments of the present application do not limit this.
[0060] It should also be noted that any of the above transistors may be any type of transistor, such as a CMOS (Complementary Metal Oxide Semiconductor) transistor, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated-Gate Bipolar Transistor), etc. In order to form a differential pair and have good differential performance, transistors with the same device specifications, such as the first transistor and the second transistor, may have equivalent characteristics in other aspects in addition to having equal channel width-to-length ratios; for example, the first transistor and the second transistor may be fabricated as mirror-image transistors, or may be formed by sampling the same process, size, and manufacturing specifications on the same substrate, or may be devices of the same model, batch, and device parameters, etc.
[0061] Figure 4 It is a structural block diagram of a communication device provided by an embodiment of the present application. The communication device may be, for example, at least one of a signal transceiver device, a signal receiving device, a signal transmitting device, and a signal modulation device, and may have the product form of a communication module within an electronic product. Refer to Figure 4 , the communication device includes a signal amplification circuit 10 and a signal transceiver circuit 20, where the signal amplification circuit 10 may be implemented by any of the above signal amplification circuits, and the signal amplification circuit 10 is connected to the signal transceiver circuit 20 for amplifying the received or to-be-transmitted signal.
[0062] Figure 5 It is a structural block diagram of an electronic device provided by an embodiment of the present application. Refer to Figure 5 , the electronic device includes a communication device 100 and a processor 200. The communication device 100 is any of the above communication devices, and the communication device 100 is connected to the processor 200.
[0063] It should be noted that the electronic device can be, for example, any kind of signal system device, such as a signal filter, a signal interface, a signal converter, a signal generator, a data transceiver device, etc., or it can also be any kind of application device containing a signal system device, such as a whole machine controller, a battery management system, an electric vehicle, etc. In different implementation manners, the above-mentioned processor 200 can be implemented in different forms, such as a controller or a single-chip microcomputer that receives digital signals, a main control module of a vehicle controller, etc.
[0064] In one example, the main control module of the vehicle controller includes a processor and a memory. Among them, the processor can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor can be implemented in at least one of the following hardware forms: DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), PLA (Programmable Logic Array). The processor can also include a main processor and a coprocessor. The main processor is a processor used to process data in the wake-up state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor can be integrated with a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the vehicle display screen. In some embodiments, the processor can also include an AI (Artificial Intelligence) processor, and the AI processor is used to process computing operations related to machine learning. The memory can include one or more computer-readable storage media, and the computer-readable storage media can be non-transitory. The memory can also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices, flash storage devices.
[0065] As another example, in any implementation manner of the embodiments of the present application, the above-mentioned processor 200 can include one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components.
[0066] The above are only alternative embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included within the protection scope of the present application.
Claims
1. A signal amplification circuit, characterized in that, The circuit includes a variable gain amplifier, a first voltage follower, a second voltage follower, and a gain adjustment module; The positive input terminal of the variable gain amplifier is connected to the positive input terminal of the signal amplification circuit, and the negative input terminal of the variable gain amplifier is connected to the negative input terminal of the signal amplification circuit; The input terminal of the first voltage follower is connected to the positive output terminal of the variable gain amplifier, and the output terminal of the first voltage follower is connected to the positive output terminal of the signal amplification circuit; The input terminal of the second voltage follower is connected to the negative output terminal of the variable gain amplifier, and the output terminal of the second voltage follower is connected to the negative output terminal of the signal amplification circuit; The gain adjustment module is respectively connected to the power supply voltage line, the adjustment signal input terminal, and the positive input terminal and the negative input terminal of the variable gain amplifier. The gain adjustment module is configured to adjust the resistance values of the first equivalent resistor and the second equivalent resistor according to the voltage value of the adjustment signal provided by the adjustment signal input terminal. The first equivalent resistor is the equivalent resistor of the gain adjustment module between the power supply voltage line and the positive output terminal of the variable gain amplifier, and the second equivalent resistor is the equivalent resistor of the gain adjustment module between the power supply voltage line and the negative output terminal of the variable gain amplifier.
2. The signal amplification circuit according to claim 1, wherein The gain adjustment module includes a first transistor and a second transistor. The adjustment signal input terminal includes a first input terminal. The gate of the first transistor is connected to the first input terminal. The first pole of the first transistor is connected to the power supply voltage line. The second pole of the first transistor is connected to the positive output terminal of the variable gain amplifier. The gate of the second transistor is connected to the first input terminal. The first pole of the second transistor is connected to the power supply voltage line. The second pole of the second transistor is connected to the negative output terminal of the variable gain amplifier.
3. The signal amplification circuit according to claim 2, wherein The adjustment signal input terminal further includes a second input terminal. The gain adjustment module further includes: A third transistor spaced between the second pole of the first transistor and the positive output terminal of the variable gain amplifier. The gate of the third transistor is connected to the second input terminal. The first pole of the third transistor is connected to the second pole of the first transistor. The second pole of the third transistor is connected to the positive output terminal of the variable gain amplifier; and, A fourth transistor spaced between the second pole of the second transistor and the negative output terminal of the variable gain amplifier. The gate of the fourth transistor is connected to the second input terminal. The first pole of the fourth transistor is connected to the second pole of the second transistor. The second pole of the fourth transistor is connected to the negative output terminal of the variable gain amplifier.
4. The signal amplification circuit according to claim 3, wherein The first voltage follower includes a fifth transistor. The gate of the fifth transistor is connected to the positive output terminal of the variable gain amplifier. The first pole of the fifth transistor is connected to the power supply voltage line. The second pole of the fifth transistor is connected to the positive output terminal of the signal amplification circuit; The second voltage follower includes a sixth transistor. The gate of the sixth transistor is connected to the negative output terminal of the variable gain amplifier. The first pole of the sixth transistor is connected to the power supply voltage line. The second pole of the sixth transistor is connected to the negative output terminal of the signal amplification circuit.
5. The signal amplification circuit according to any one of claims 4, characterized in that, The variable gain amplifier includes a seventh transistor, an eighth transistor, a first current source, a second current source, and a first resistor. Among them, The gate of the seventh transistor is connected to the positive input terminal of the variable gain amplifier. The first pole of the seventh transistor is respectively connected to the positive pole of the first current source and the first end of the first resistor. The second pole of the seventh transistor is connected to the positive output terminal of the variable gain amplifier. The gate of the eighth transistor is connected to the negative input terminal of the variable gain amplifier. The first pole of the eighth transistor is respectively connected to the positive pole of the second current source and the second end of the first resistor. The second pole of the eighth transistor is connected to the negative output terminal of the variable gain amplifier. The negative poles of the first current source and the second current source are both connected to the common terminal of the signal amplification circuit.
6. The signal amplification circuit according to claim 5, wherein The gain Av of the signal amplification circuit is configured and achieved through the following formula: Among them, R A = gm1 × r1 × R D , R B = gm2 × r2 × r3, where gm1 is the transconductance value of the seventh transistor and the eighth transistor, R D is half of the resistance value of the first resistor, gm2 is the transconductance value of the third transistor and the fourth transistor, r1 is the source-drain equivalent resistance of the seventh transistor and the eighth transistor, r2 is the source-drain equivalent resistance of the third transistor and the fourth transistor, and r3 is the source-drain equivalent resistance of the first transistor and the second transistor.
7. The signal amplification circuit according to claim 5, wherein The first transistor and the second transistor have the same device specifications. The third transistor and the fourth transistor have the same device specifications. The fifth transistor and the sixth transistor have the same device specifications. The seventh transistor and the eighth transistor have the same device specifications.
8. A communication device, characterized in that, The communication device includes the signal amplification circuit according to any one of claims 1 to 7.
9. The communication device according to claim 8, characterized in that, The communication device is at least one of a signal transceiver device, a signal receiving device, a signal transmitting device, and a signal modulation device.
10. An electronic device, characterized in that, The electronic device includes the communication device according to claim 8 or 9.