Operational amplifier diffuser circuit and signal generator

Abstract

The utility model provides an operational amplifier diffuser circuit and a signal generator, and relates to the technical field of semiconductor detection. The operational amplifier voltage expansion circuit comprises an operational amplifier module, an upper voltage expansion module, a lower voltage expansion module, an upper current expansion module, a lower current expansion module and a feedback compensation module. Wherein the positive-phase input end of the operational amplifier module is used for receiving an input signal, the negative-phase input end of the operational amplifier module is connected with the output end of the feedback compensation module, the operational amplifier output end of the operational amplifier module is connected with the input ends of the upper / lower voltage expansion module, the upper / lower current expansion module and the feedback compensation module, and the positive / negative power supply end of the operational amplifier module is connected with the output end of the upper / lower voltage expansion module; an external positive / negative power supply is respectively connected with the upper / lower voltage expansion module and the upper / lower current expansion module, the upper / lower voltage expansion module is used for obtaining a first / second target voltage according to the output voltage of the operational amplifier module and the power supply voltage of the positive / negative power supply, and the upper / lower current expansion module is used for enhancing the current capability of an output signal. According to the operational amplifier, higher voltage / current output can be realized on the basis of the existing operational amplifier.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of semiconductor detection, in particular to an operational amplifier (op-amp) voltage expansion circuit and a signal generator. BACKGROUND

[0002] In the technical field of semiconductor detection, a signal generator is needed to apply a voltage signal to a to-be-detected object, and then various performance indicators of the to-be-detected object are evaluated by collecting and analyzing voltage and current data. The signal generator used to apply the voltage signal is very important in this process.

[0003] With the continuous development of semiconductor technology, more and more high-voltage and high-power semiconductor devices have emerged, and the requirements for the signal generator used to test these semiconductor devices are also increasing.

[0004] At present, the conventional signal generators on the market directly use high-voltage and high-power op-amp chips to achieve the function. Although this method is simple, the output voltage / current range is limited by the chip itself. For example, the conventional op-amp chip on the market can provide a voltage / current of up to 20 mA@±100 V, but to achieve higher voltage / current output, other methods must be used. CONTENT OF THE INVENTION

[0005] The application provides an op-amp voltage expansion circuit and a signal generator, which can achieve higher voltage / current output based on the existing op-amp. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the application provides an op-amp voltage expansion circuit, which comprises an op-amp module, an upper voltage expansion module, a lower voltage expansion module, an upper current expansion module, a lower current expansion module, and a feedback compensation module.

[0007] The op-amp module comprises a non-inverting input end, an inverting input end, an op-amp output end, an op-amp positive power supply end, and an op-amp negative power supply end. The non-inverting input end is used to receive an input signal. The inverting input end is connected to the output end of the feedback compensation module. The op-amp output end is connected to one input end of the upper voltage expansion module, one input end of the lower voltage expansion module, one input end of the upper current expansion module, one input end of the lower current expansion module, and the input end of the feedback compensation module. The op-amp positive power supply end is connected to the output end of the upper voltage expansion module. The op-amp negative power supply end is connected to the output end of the lower voltage expansion module.

[0008] Another input terminal of the upper voltage expansion module is connected with an external positive power supply, for obtaining a first target voltage according to the output voltage of the operational amplifier module and a power supply voltage provided by the positive power supply, the first target voltage is used for supplying power to the operational amplifier module, and the first target voltage is between the output voltage of the operational amplifier module and the power supply voltage provided by the positive power supply; an output terminal of the upper voltage expansion module is connected with an input terminal of the feedback compensation module;

[0009] Another input terminal of the lower voltage expansion module is connected with an external negative power supply, for obtaining a second target voltage according to the output voltage of the operational amplifier module and a power supply voltage provided by the negative power supply, the second target voltage is used for supplying power to the operational amplifier module, and the second target voltage is between the output voltage of the operational amplifier module and the power supply voltage provided by the negative power supply; an output terminal of the lower voltage expansion module is connected with an input terminal of the feedback compensation module;

[0010] Another input terminal of the upper current expansion module is connected with an external positive power supply, another input terminal of the lower current expansion module is connected with an external negative power supply, and output terminals of the upper current expansion module and the lower current expansion module are both connected with an input terminal of the feedback compensation module; the upper current expansion module and the lower current expansion module are used for enhancing current capability of an output signal output by the operational amplifier module;

[0011] The feedback compensation module is used for feeding back the output signal processed by the upper voltage expansion module / the lower voltage expansion module, the upper current expansion module / the lower current expansion module back to an inverting input terminal of the operational amplifier module.

[0012] Optionally, the upper voltage expansion module comprises a first voltage dividing circuit and a first follower circuit; an input terminal of the first voltage dividing circuit is connected with the positive power supply and the output terminal of the operational amplifier module respectively, an output terminal is connected with an input terminal of the first follower circuit, for obtaining the first target voltage according to the output voltage of the operational amplifier module and the power supply voltage provided by the positive power supply, and sending the first target voltage to the first follower circuit; an output terminal of the first follower circuit is connected with the positive power supply terminal of the operational amplifier, for outputting the first target voltage to the operational amplifier module to supply power to the operational amplifier module;

[0013] The lower voltage expansion module comprises a second voltage dividing circuit and a second follower circuit; an input end of the second voltage dividing circuit is connected with the negative power supply and the operational amplifier output end respectively, an output end thereof is connected with an input end of the second follower circuit, and the second voltage dividing circuit is configured to obtain the second target voltage according to the output voltage of the operational amplifier module and the power supply voltage provided by the negative power supply, and send the second target voltage to the second follower circuit; and an output end of the second follower circuit is connected with the operational amplifier negative power supply end, and the second follower circuit is configured to output the second target voltage to the operational amplifier module to supply power for the operational amplifier module.

[0014] Optionally, the first voltage dividing circuit comprises a first resistor R1 and a second resistor R2; and the second voltage dividing circuit comprises a third resistor R3 and a fourth resistor R4.

[0015] One end of the first resistor R1 is connected with the positive power supply, and one end of the second resistor R2 is connected with the operational amplifier output end; and a connection point of the first resistor R1 and the second resistor R2 is connected with an input end of the first follower circuit.

[0016] One end of the fourth resistor R4 is connected with the negative power supply, and one end of the third resistor R3 is connected with the operational amplifier output end; and a connection point of the fourth resistor R4 and the third resistor R3 is connected with an input end of the second follower circuit.

[0017] Optionally, the first follower circuit is implemented by using an operational amplifier, a high-power triode or an MOS tube.

[0018] The second follower circuit is implemented by using an operational amplifier, a high-power triode or an MOS tube.

[0019] Optionally, the operational amplifier module integrates an operational amplifier chip.

[0020] Optionally, the upper current expansion module is implemented by using an MOS tube, a triode or a Darlington tube.

[0021] The lower current expansion module is implemented by using an MOS tube, a triode or a Darlington tube.

[0022] Optionally, the feedback compensation module comprises a gain setting sub-module and a phase compensation sub-module.

[0023] The gain setting sub-module is configured to set a proportional relationship between an output signal and an input signal.

[0024] The phase compensation sub-module is configured to adjust a phase margin of the entire system circuit.

[0025] In a second aspect, an embodiment of the present application provides a signal generator comprising the operational amplifier voltage expansion circuit as described in the first aspect.

[0026] The beneficial effects of the technical solutions of the present application are as follows:

[0027] The op-amp voltage expansion circuit provided by the embodiments of the present application comprises an op-amp module, an upper voltage expansion module, a lower voltage expansion module, an upper current expansion module, a lower current expansion module and a feedback compensation module. The op-amp module comprises a non-inverting input end, an inverting input end, an op-amp output end, an op-amp positive power supply end and an op-amp negative power supply end. The non-inverting input end is configured to receive an input signal, the inverting input end is connected to an output end of the feedback compensation module, and the op-amp output end is connected to input ends of the upper voltage expansion module, the lower voltage expansion module, the upper current expansion module, the lower current expansion module and the feedback compensation module respectively; the op-amp positive power supply end is connected to an output end of the upper voltage expansion module; and the op-amp negative power supply end is connected to an output end of the lower voltage expansion module. Another input end of the upper voltage expansion module is connected to an external positive power supply, configured to obtain a first target voltage according to an output voltage of the op-amp module and a power supply voltage provided by the positive power supply, the first target voltage is used to supply power to the op-amp module, and the first target voltage is between the output voltage of the op-amp module and the power supply voltage provided by the positive power supply; another input end of the lower voltage expansion module is connected to an external negative power supply, configured to obtain a second target voltage according to the output voltage of the op-amp module and a power supply voltage provided by the negative power supply, the second target voltage is used to supply power to the op-amp module, and the second target voltage is between the output voltage of the op-amp module and the power supply voltage provided by the negative power supply; the upper current expansion module and the lower current expansion module are configured to enhance the current capacity of an output signal output by the op-amp module; and the feedback compensation module is configured to feed back the output signal processed by the upper / lower voltage expansion module and the upper / lower current expansion module to the inverting input end of the op-amp module. The op-amp module is supplied with the first target voltage / second target voltage obtained by the upper voltage expansion module / lower voltage expansion module as a power supply voltage, so that the output voltage of the op-amp module is always between the power supply voltages of the power supplies, and higher voltage output is achieved. The current capacity of the output signal is further enhanced by the upper / lower current expansion module. The op-amp module can be improved on the basis of the existing op-amp to achieve higher voltage / current output. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A structural schematic diagram of the op-amp voltage expansion circuit disclosed by the embodiments of the present application is shown in FIG. 1;

[0029] Figure 2 Another structural schematic diagram of the op-amp voltage expansion circuit disclosed by the embodiments of the present application is shown in FIG. 2;

[0030] Figure 3 Still another structural schematic diagram of the op-amp voltage expansion circuit disclosed by the embodiments of the present application is shown in FIG. 3. DETAILED DESCRIPTION

[0031] To make the technical problems, technical solutions, and advantages of this application clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0032] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0033] In the various embodiments of this application, it should be understood that the sequence number of each process described below does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0034] Currently, conventional operational amplifier chips on the market can provide a maximum voltage / current of 20mA@±100V, which cannot achieve higher voltage / current outputs. Therefore, this application provides an operational amplifier voltage dilution circuit that can achieve higher voltage / current outputs based on existing operational amplifiers.

[0035] like Figure 1 As shown, the operational amplifier expansion circuit provided in this application includes: operational amplifier module 10, upper expansion module 20, lower expansion module 30, upper current expansion module 40, lower current expansion module 50, and feedback compensation module 60.

[0036] The operational amplifier module 10 includes a non-inverting input terminal, an inverting input terminal, an operational amplifier output terminal, an operational amplifier positive power supply terminal, and an operational amplifier negative power supply terminal. The non-inverting input terminal is used to receive the input signal; the inverting input terminal is connected to the output terminal of the feedback compensation module 60; the operational amplifier output terminal is connected to one input terminal of the upper diffuser module 20, one input terminal of the lower diffuser module 30, one input terminal of the upper current amplification module 40, one input terminal of the lower current amplification module 50, and the input terminal of the feedback compensation module 60, respectively; the operational amplifier positive power supply terminal is connected to the output terminal of the upper diffuser module 20; and the operational amplifier negative power supply terminal is connected to the output terminal of the lower diffuser module 30.

[0037] In the embodiment of the present application, the input signal is provided to the non-inverting input terminal of the operational amplifier module 10, and the final output signal is fed back to the inverting input terminal of the operational amplifier module 10 through the feedback compensation module 60, so as to maintain the consistency of the input signal and the output signal voltage of the feedback compensation module 60. Based on the "virtual short" principle of the ideal operational amplifier, the output signal output from the output terminal of the operational amplifier module 10 is used to drive the subsequent up / down voltage expansion module and up / down current expansion module, and the size of the output signal is determined by the voltage of the input signal received by the non-inverting input terminal multiplied by the gain.

[0038] The operational amplifier module 10 in the embodiment of the present application can be integrated with an operational amplifier chip, i.e., composed of an integrated operational amplifier chip.

[0039] The other input terminal of the up voltage expansion module 20 is connected with an external positive power supply, which is used to obtain a first target voltage according to the output voltage of the operational amplifier module 10 and the power supply voltage provided by the positive power supply, the first target voltage is used to power the operational amplifier module 10, and the size of the first target voltage is between the output voltage of the operational amplifier module 10 and the power supply voltage provided by the positive power supply. The output terminal of the up voltage expansion module 20 is connected with the input terminal of the feedback compensation module 60.

[0040] The other input terminal of the down voltage expansion module 30 is connected with an external negative power supply, which is used to obtain a second target voltage according to the output voltage of the operational amplifier module 10 and the power supply voltage provided by the negative power supply, the second target voltage is used to power the operational amplifier module 10, and the size of the second target voltage is between the output voltage of the operational amplifier module 10 and the power supply voltage provided by the negative power supply. The output terminal of the down voltage expansion module 30 is connected with the input terminal of the feedback compensation module 60.

[0041] In the conventional use, the power supply of the operational amplifier module is usually a fixed voltage value, and the output voltage of the operational amplifier module is limited to the power supply voltage of the power supply, i.e., the output voltage of the operational amplifier module cannot exceed the range of the power supply voltage of the power supply. For example, the power supply range of an operational amplifier module is ±18V, and in the conventional design, the output voltage range of the operational amplifier module must be within the range of ±18V. Therefore, the existing conventional operational amplifier module cannot achieve higher voltage / current output.

[0042] The positive power supply and the negative power supply in the embodiment of the application can be power supplies with a voltage much higher than ±18V. One input terminal of the up voltage expansion module 20 is connected with the output terminal of the operational amplifier, for receiving the output voltage of the operational amplifier module 10. The other input terminal is connected with the positive power supply, for receiving the high voltage input from the external positive power supply. The up voltage expansion module 20 obtains a first target voltage between the output voltage and the power supply voltage of the positive power supply based on the output voltage of the operational amplifier module 10 and the power supply voltage of the positive power supply through voltage division. Similarly, one input terminal of the down voltage expansion module 30 is connected with the output terminal of the operational amplifier, for receiving the output voltage of the operational amplifier module 10. The other input terminal is connected with the negative power supply, for receiving the high voltage input from the external negative power supply. The down voltage expansion module 30 obtains a second target voltage between the output voltage and the power supply voltage of the negative power supply based on the output voltage of the operational amplifier module 10 and the power supply voltage of the negative power supply through voltage division. The first target voltage and the second target voltage change with the range of the output voltage of the operational amplifier module 10.

[0043] The first target voltage and the second target voltage are used to supply power to the operational amplifier module 10, which makes the output voltage of the operational amplifier module 10 always within the voltage range composed of the first target voltage and the second target voltage. This not only satisfies the condition that the output voltage of the operational amplifier is always between the power supply voltages of the operational amplifier, but also eliminates the limitation that the output voltage of the operational amplifier module 10 cannot exceed ±18V, realizing higher voltage / current output.

[0044] As an optional embodiment of the application, as shown in Figure 2 The up voltage expansion module 20 can include a first voltage division circuit 21 and a first follower circuit 22. The input terminals of the first voltage division circuit 21 are connected with the positive power supply and the output terminal of the operational amplifier respectively. The output terminal is connected with the input terminal of the first follower circuit 22, for obtaining the first target voltage based on the output voltage of the operational amplifier module 10 and the power supply voltage of the positive power supply, and sending the first target voltage to the first follower circuit 22. The output terminal of the first follower circuit 22 is connected with the positive power supply terminal of the operational amplifier, for outputting the first target voltage to the operational amplifier module 10, realizing power supply to the operational amplifier module 10. The down voltage expansion module 30 includes a second voltage division circuit 31 and a second follower circuit 32. The input terminals of the second voltage division circuit 31 are connected with the negative power supply and the output terminal of the operational amplifier respectively. The output terminal is connected with the input terminal of the second follower circuit 32, for obtaining the second target voltage based on the output voltage of the operational amplifier module 10 and the power supply voltage of the negative power supply, and sending the second target voltage to the second follower circuit 32. The output terminal of the second follower circuit 32 is connected with the negative power supply terminal of the operational amplifier, for outputting the second target voltage to the operational amplifier module 10, realizing power supply to the operational amplifier module 10.

[0045] In this embodiment, the output signal (i.e. output voltage) of the operational amplifier module 10 is provided to the first / second voltage dividing circuit in the up / down voltage expansion module for voltage division, to obtain a voltage between the operational amplifier output voltage and the power supply voltage, and to provide the voltage to the operational amplifier module 10 through the first / second follower circuit as a power supply of the operational amplifier module 10, so that the output voltage of the operational amplifier module 10 is always between the power supply voltage of the operational amplifier power supply, thereby realizing higher voltage output.

[0046] Further combining Figure 3 As shown, the first voltage dividing circuit 21 in the embodiment of the application can include a first resistor R1 and a second resistor R2, and the second voltage dividing circuit 31 can include a third resistor R3 and a fourth resistor R4.

[0047] One end of the first resistor R1 is connected to the positive power supply, and one end of the second resistor R2 is connected to the operational amplifier output end; the connection point of the first resistor R1 and the second resistor R2 is connected to the input end of the first follower circuit 22;

[0048] One end of the fourth resistor R4 is connected to the negative power supply, and one end of the third resistor R3 is connected to the operational amplifier output end; the connection point of the fourth resistor R4 and the third resistor R3 is connected to the input end of the second follower circuit 32.

[0049] In the embodiment of the application, the first voltage dividing circuit 21 is composed of voltage dividing resistors R1 and R2, for voltage division of the positive power supply and the operational amplifier output voltage; the second voltage dividing circuit 31 is composed of voltage dividing resistors R3 and R4, for voltage division of the negative power supply and the operational amplifier output voltage. The voltage dividing value of the first voltage dividing circuit 21 is Vop+R2 / (R2+R1)*(Vp-Vop), wherein Vop is the operational amplifier output voltage, and Vp is the positive power supply voltage. Similarly, the voltage dividing value of the second voltage dividing circuit 31 is Vop+R3 / (R3+R4)*(Vn-Vop), wherein Vop is the operational amplifier output voltage, and Vn is the negative power supply voltage.

[0050] In the embodiment of the application, the first follower circuit 22 and the second follower circuit 32 mainly realize the function of following the voltage dividing value for output, to increase the driving capability and supply power to the operational amplifier. In specific implementation, the first follower circuit 22 can be implemented by using an operational amplifier, a high-power triode, or a MOS tube, and the second follower circuit 32 can be implemented by using an operational amplifier, a high-power triode, or a MOS tube.

[0051] The upper current expansion module 40 and the lower current expansion module 50 are used to realize the enhancement of the current capacity of the output signal. Specifically, another input end of the upper current expansion module 40 is connected with an external positive power supply, another input end of the lower current expansion module 50 is connected with an external negative power supply, and the output end of the upper current expansion module 40 and the output end of the lower current expansion module 50 are both connected with an input end of the feedback compensation module 60. The upper current expansion module 40 and the lower current expansion module 50 can enhance the current intensity of the output signal output by the operational amplifier module 10.

[0052] In actual application, the upper current expansion module 40 is usually realized by a MOS tube, a triode or a Darlington tube, and the lower current expansion module 50 is usually realized by a MOS tube, a triode or a Darlington tube. That is, the upper / lower current expansion module realizes the enhancement of the output current capacity by using an internal high-power MOS tube / triode / Darlington tube, so as to achieve the purpose of current expansion.

[0053] The feedback compensation module 60 is used to feed back the output signal processed by the upper voltage expansion module 20 / lower voltage expansion module 30 and the upper current expansion module 40 / lower current expansion module 50 to the inverting input end of the operational amplifier module 10.

[0054] In actual application, the operational amplifier is usually used by adding negative feedback, otherwise the output of the operational amplifier module will oscillate. Therefore, the output signal of the operational amplifier module 10 is fed back to the operational amplifier module 10 through the feedback compensation module 60, so as to ensure the stability of the output of the operational amplifier module.

[0055] As an optional embodiment of the present application, as shown in Figure 2 The feedback compensation module 60 includes a gain setting sub-module 61 and a phase compensation sub-module 62. Wherein:

[0056] The gain setting sub-module 61 is used to set the proportional relationship between the output signal and the input signal.

[0057] The phase compensation sub-module 62 is used to adjust the phase margin of the entire system circuit.

[0058] In the embodiment, the feedback compensation module 60 includes two functions of gain setting and phase compensation. Specifically, the gain setting sub-module 61 is used to realize the final output signal = input signal * setting gain. It should be noted that the input signal in the formula refers to the output signal processed by the upper / lower voltage expansion module and the upper / lower current expansion module, and the final output signal refers to the output signal finally fed back to the negative phase input end of the operational amplifier module 10. In addition, the phase compensation sub-module 62 is used to adjust the phase margin of the entire system circuit, so as to ensure that the output signal does not overshoot or oscillate.

[0059] The op-amp voltage expansion circuit can effectively improve the output voltage range and output current capacity of the op-amp chip, and breaks through the output range limitation of a single chip. At present, it has been verified through tests that the op-amp voltage expansion circuit structure can realize a signal output level of ±200V@200mA.

[0060] Based on the op-amp voltage expansion circuit provided in the foregoing embodiments of the present application, the present embodiment further provides a signal generator comprising the op-amp voltage expansion circuit described above.

[0061] The above is the preferred embodiment of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles described in the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An operational amplifier voltage boosting circuit characterized by comprising: The circuit comprises an operational amplifier module, an upper voltage expansion module, a lower voltage expansion module, an upper current expansion module, a lower current expansion module and a feedback compensation module. The operational amplifier module comprises a non-inverting input end, an inverting input end, an operational amplifier output end, an operational amplifier positive power supply end and an operational amplifier negative power supply end; the non-inverting input end is used for receiving an input signal; the inverting input end is connected with an output end of the feedback compensation module; the operational amplifier output end is connected with one input end of the upper voltage expansion module, one input end of the lower voltage expansion module, one input end of the upper current expansion module, one input end of the lower current expansion module and an input end of the feedback compensation module respectively; the operational amplifier positive power supply end is connected with an output end of the upper voltage expansion module; and the operational amplifier negative power supply end is connected with an output end of the lower voltage expansion module. Another input end of the upper voltage expansion module is connected with an external positive power supply, and is used for obtaining a first target voltage according to an output voltage of the operational amplifier module and a power supply voltage provided by the positive power supply; the first target voltage is used for supplying power to the operational amplifier module; and the first target voltage is between the output voltage of the operational amplifier module and the power supply voltage provided by the positive power supply; and an output end of the upper voltage expansion module is connected with an input end of the feedback compensation module. Another input end of the lower voltage expansion module is connected with an external negative power supply, and is used for obtaining a second target voltage according to the output voltage of the operational amplifier module and a power supply voltage provided by the negative power supply; the second target voltage is used for supplying power to the operational amplifier module; and the second target voltage is between the output voltage of the operational amplifier module and the power supply voltage provided by the negative power supply; and an output end of the lower voltage expansion module is connected with an input end of the feedback compensation module. Another input end of the upper current expansion module is connected with the external positive power supply, another input end of the lower current expansion module is connected with the external negative power supply, and an output end of the upper current expansion module and an output end of the lower current expansion module are connected with the input end of the feedback compensation module; and the upper current expansion module and the lower current expansion module are used for enhancing current capability of an output signal output by the operational amplifier module. The feedback compensation module is used for feeding back the output signal processed by the upper voltage expansion module / the lower voltage expansion module, the upper current expansion module / the lower current expansion module to the inverting input end of the operational amplifier module.

2. The operational amplifier voltage expansion circuit according to claim 1, wherein the upper voltage expansion module comprises a first voltage divider circuit and a first follower circuit; input ends of the first voltage divider circuit are connected with the positive power supply and the operational amplifier output end respectively, an output end is connected with an input end of the first follower circuit, and is used for obtaining the first target voltage according to the output voltage of the operational amplifier module and the power supply voltage provided by the positive power supply, and sending the first target voltage to the first follower circuit; and an output end of the first follower circuit is connected with the operational amplifier positive power supply end, and is used for outputting the first target voltage to the operational amplifier module to supply power to the operational amplifier module. ​ ​ The lower voltage expansion module comprises a second voltage dividing circuit and a second follower circuit; an input end of the second voltage dividing circuit is connected with the negative power supply and the operational amplifier output end respectively, an output end is connected with an input end of the second follower circuit, and the second target voltage is obtained according to the output voltage of the operational amplifier module and the power supply voltage provided by the negative power supply, and the second target voltage is sent to the second follower circuit; An output end of the second follower circuit is connected with the operational amplifier negative power supply end, and the second target voltage is output to the operational amplifier module to supply power for the operational amplifier module.

3. The op-amp voltage boosting circuit of claim 2, wherein The first voltage dividing circuit comprises a first resistor R1 and a second resistor R2; the second voltage dividing circuit comprises a third resistor R3 and a fourth resistor R4; One end of the first resistor R1 is connected with the positive power supply, one end of the second resistor R2 is connected with the operational amplifier output end, and a connection point of the first resistor R1 and the second resistor R2 is connected with an input end of the first follower circuit; One end of the fourth resistor R4 is connected with the negative power supply, one end of the third resistor R3 is connected with the operational amplifier output end, and a connection point of the fourth resistor R4 and the third resistor R3 is connected with an input end of the second follower circuit.

4. The operational amplifier voltage expansion circuit according to claim 2, wherein The first follower circuit is implemented by an operational amplifier, a high-power triode or an MOS tube; The second follower circuit is implemented by an operational amplifier, a high-power triode or an MOS tube.

5. The op-amp voltage boosting circuit of claim 1, wherein The operational amplifier module is integrated with an operational amplifier chip.

6. The operational amplifier voltage expansion circuit according to claim 1, wherein The upper current expansion module is implemented by an MOS tube, a triode or a Darlington tube; The lower current expansion module is implemented by an MOS tube, a triode or a Darlington tube.

7. The op-amp voltage boosting circuit of claim 1, wherein The feedback compensation module comprises a gain setting sub-module and a phase compensation sub-module; The gain setting sub-module is used for setting a proportional relationship between an output signal and an input signal; The phase compensation sub-module is used for adjusting a phase margin of the whole system circuit.

8. A signal generator comprising the operational amplifier voltage expansion circuit according to any one of claims 1 to 7.

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