CN109617534B - Charge amplifier - Google Patents
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Abstract
The invention discloses a charge amplifier, comprising: the device comprises an analog switch module, a charge signal conditioning module, a correction charge generation module and a control processing module, wherein the input end of the analog switch module is connected with the control processing module, the output end of the analog switch module is connected with the input end of the charge signal conditioning module, the output end of the charge signal conditioning module is connected with the input end of the control processing module, and the input end of the correction charge generation module is connected with the output end of the control processing module. The invention can automatically finish the correction test of the charge amplifier under the condition of not needing to be connected with external test equipment, thereby reducing the cost of the correction test and saving the test time.
Description
Technical Field
The invention belongs to the field of electricity, and particularly relates to a charge amplifier.
Background
In practical engineering equipment, sensors (such as accelerometers, microphones, hydrophones and the like) made of piezoelectric materials for measuring various non-electrical physical quantities are widely used. Since piezoelectric materials have characteristics of outputting various types of signals to be measured converted into electric charge, a charge amplifier, which is an amplifier for converting a charge signal into a voltage signal, is often used as an interface circuit of a piezoelectric sensor. In applications where a large number of piezoelectric sensors are used (e.g., in arrays), the design criteria of the charge amplifier needs to be corrected in order to ensure that the designed charge amplifier can meet the specifications and meet the requirements for consistency between amplifiers. In general, since the amount of electric charge output from the piezoelectric sensor is relatively small, a charge generator capable of simulating the output of the piezoelectric sensor is generally used as the correction means.
The chinese patent application publication No. CN104270108a discloses a charge amplifier, which has adjustable output amplitude and output bandwidth, and has both analog and digital output interfaces. However, no correction unit module is provided, and at the moment, external special equipment is required for correction, so that the purchase cost of the equipment is increased, and the debugging time of the equipment is also increased.
The application publication number CN203775152U of the utility model discloses a self-checking charge amplifier, which can remotely monitor whether the amplifier works normally. But the amplitude of the signal waveform for self-checking is too high and is not adjustable; meanwhile, the signal frequency cannot be adjusted in real time and cannot be used for correcting the amplifier.
Disclosure of Invention
The technical problem of the invention is solved: the embodiment of the invention provides a charge amplifier, which can automatically finish the correction test of the charge amplifier under the condition of not connecting external test equipment by setting and controlling the switch switching of an analog switch module.
In order to solve the above technical problem, the present invention discloses a charge amplifier, including: the device comprises an analog switch module, a charge signal conditioning module, a correction charge generation module and a control processing module, wherein the input end of the analog switch module is connected with the control processing module, the output end of the analog switch module is connected with the input end of the charge signal conditioning module, the output end of the charge signal conditioning module is connected with the input end of the control processing module, and the input end of the correction charge generation module is connected with the output end of the control processing module; the analog switch module is configured to receive a first control signal output by the control processing module in a normal working state, and perform switch switching according to the first control signal so as to connect an input end of the analog switch module with an output end of an external sensor; in a correction test state, receiving a second control signal output by the control processing module, and performing switching according to the second control signal to connect the input end of the analog switch module with the output end of the correction charge generation module; the charge signal conditioning module is configured to receive a first charge signal output by the external sensor through the analog switch module, process the first charge signal, and output the processed first charge signal to the control processing module in a normal working state; under the correction test state, receiving a correction charge signal output by the correction charge generation module, processing the correction charge signal, and outputting the processed correction charge signal to the control processing module; the correction charge generation module is configured to receive a second charge signal output by the control processing module, perform correction processing on the second charge signal, generate a correction charge signal, and output the correction charge signal to the charge signal conditioning module through the analog switch module in a correction test state; the control processing module is configured to generate the first control signal and output the first control signal to the analog switch module in a normal working state, and control the analog switch module to perform switch switching so as to connect an input end of the analog switch module with an output end of an external sensor and receive a processed first charge signal output by the charge signal conditioning module; and under a correction test state, generating the second control signal, outputting the second control signal to the analog switch module, controlling the analog switch module to switch so as to control the input end of the analog switch module to be connected with the output end of the correction charge generation module, outputting the second charge signal to the correction charge generation module, and receiving the processed correction charge signal output by the charge signal conditioning module.
Preferably, the analog switch module is a single-pole double-throw switch.
Preferably, the charge signal conditioning module includes a charge-voltage conversion module, an amplifying and filtering module and an AD conversion module, an input end of the charge-voltage conversion module is connected with an output end of the analog switch module, an output end of the charge-voltage conversion module is connected with an input end of the amplifying and filtering module, an output end of the amplifying and filtering module is connected with an input end of the AD conversion module, and an output end of the AD conversion module is connected with an input end of the control processing module; the charge-voltage conversion module is configured to convert the received charge signal into a voltage signal and output the converted voltage signal to the amplification filtering module; the amplifying and filtering module is configured to receive the voltage signal after the conversion processing, perform amplifying and filtering processing on the voltage signal after the conversion processing, and output the voltage signal after the amplifying and filtering processing to the AD conversion module; the AD conversion module is configured to receive the voltage signal after the amplification and filtering processing, perform analog-to-digital conversion processing on the voltage signal after the amplification and filtering processing, and output the voltage signal after the analog-to-digital conversion processing to the control processing module.
Preferably, the correction charge generation module comprises a voltage charge conversion module, a low-pass filter module and a DA conversion module, an input end of the DA conversion module is connected with an output end of the control processing module, an output end of the DA conversion module is connected with an input end of the low-pass filter module, an output end of the low-pass filter module is connected with an input end of the voltage charge conversion module, and an output end of the voltage charge conversion module is connected with an input end of the analog switch module; the DA conversion module is configured to perform analog-to-digital conversion processing on the received charge signal output by the control processing module and output the charge signal after analog-to-digital conversion processing to the low-pass filtering module; the low-pass filtering module is configured to receive the charge signal after analog-to-digital conversion processing, perform signal selection and filtering processing on the charge signal after analog-to-digital conversion processing, and output the charge signal after filtering processing to the voltage-to-charge conversion module; the voltage-charge conversion module is configured to receive the filtered charge signal, perform voltage-charge conversion processing on the filtered charge signal, and output the converted charge signal to the analog switch module.
Preferably, the charge-voltage conversion module comprises a first diode, a second diode, a first operational amplifier, a first resistor and a first capacitor, wherein the inverting input end of the first operational amplifier is connected with the anode end of the first diode, the cathode end of the second diode, the pin of the analog switch module, one end of the first resistor and one end of the first capacitor, the non-inverting end of the first operational amplifier, the cathode end of the first diode and the anode end of the second diode are grounded, and the output end of the first operational amplifier is connected to the other ends of the first resistor and the first capacitor; wherein the first diode and the second diode are configured to perform clipping processing on an input signal; the first resistor configured to provide a DC path to the first operational amplifier; the first capacitor is configured to convert an input charge signal into a voltage signal.
Preferably, the charge signal conditioning module includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor, a third capacitor and a second operational amplifier, one end of the fourth resistor is connected to the output end of the first operational amplifier, the other end of the fourth resistor is connected to one end of the second capacitor and one end of the fifth resistor, the other end of the fifth resistor, one end of the third capacitor and the non-inverting end of the second operational amplifier are connected, the other end of the third capacitor is grounded to one end of the second resistor, the other end of the second resistor and one end of the third resistor are connected to the inverting end of the second operational amplifier, and the other end of the third resistor is connected to the output end of the second operational amplifier.
Preferably, the control processing module comprises a control processing unit, and the control processing unit is internally provided with an AD module and a DA module and is provided with a plurality of IO interfaces; the AD module is connected to the output end of the second operational amplifier through a sixth resistor, and the output end of the DA module is connected to a low-pass filtering module consisting of a seventh resistor and a fourth capacitor.
Preferably, one end of the seventh resistor is connected to the output end of the DA module, the other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.
Preferably, the low-pass filtering module is a passive first-order RC filter.
Preferably, the voltage-to-charge conversion module includes a fourth operational amplifier and a fifth capacitor, a non-inverting input terminal of the fourth operational amplifier is connected to one end of the fourth capacitor and the other end of the seventh resistor, an inverting input terminal of the fourth operational amplifier is connected to an output terminal and is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is connected to one end of the analog switch module.
The invention has the following advantages:
the embodiment of the invention discloses a charge amplifier, which can automatically finish the correction test of the charge amplifier under the condition of not connecting external test equipment by controlling the switch switching of an analog switch module through a control processing module, thereby reducing the cost of the correction test and saving the test time.
Drawings
Fig. 1 is a schematic structural diagram of a charge amplifier according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit corresponding to a charge amplifier according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, which shows a schematic structural diagram of a charge amplifier according to an embodiment of the present invention, as shown in fig. 1, a charge amplifier 100 may include an analog switch module 110, a charge signal conditioning module 120, a correction charge generation module 140, and a control processing module 130, where an input end of the analog switch module 110 is connected to the control processing module 130, an output end of the analog switch module 110 is connected to an input end of the charge signal conditioning module 120, an output end of the charge signal conditioning module 120 is connected to an input end of the control processing module 130, and an input end of the correction charge generation module 140 is connected to an output end of the control processing module 130.
The analog switch module 110 may be configured to receive the first control signal output by the control processing module 130 in a normal operating state, and perform switching according to the first control signal to connect the input terminal of the analog switch module 110 with the output terminal of the external sensor. In the calibration test state, the second control signal output by the control processing module 130 is received, and the switching is performed according to the second control signal, so as to connect the input terminal of the analog switch module 110 with the output terminal of the calibration charge generating module 140.
The charge signal conditioning module 120 may be configured to receive the first charge signal output by the external sensor through the analog switch module 110, process the first charge signal, and output the processed first charge signal to the control processing module 130 in a normal operating state. In the calibration test state, the calibration charge signal output by the calibration charge generation module 140 is received and processed, and the processed calibration charge signal is output to the control processing module 130.
The calibration charge generation module 140 may be configured to receive the second charge signal output by the control processing module 130, perform calibration processing on the second charge signal, generate a calibration charge signal, and output the calibration charge signal to the charge signal conditioning module 120 through the analog switch module 110 in a calibration test state.
The control processing module 130 may be configured to generate a first control signal and output the first control signal to the analog switch module 110 in a normal operating state, control the analog switch module 110 to perform switching so as to connect the input terminal of the analog switch module 110 with the output terminal of the external sensor, and receive the processed first charge signal output by the charge signal conditioning module 120. In the calibration test state, a second control signal is generated and output to the analog switch module 110, and the analog switch module 110 is controlled to switch, so as to control the input end of the analog switch module 110 to be connected with the output end of the calibration charge generation module 140, output a second charge signal to the calibration charge generation module 140, and receive the processed calibration charge signal output by the charge signal conditioning module 120.
The control Processing module 130 may be a microcontroller, a processor, a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), or other modules having control and Signal Processing functions, and is mainly configured to receive the conditioned sensor Signal or correction Signal, generate a correction Signal waveform, and control the input data gating of the analog switch module 110.
In a preferred embodiment of the present invention, the analog switch module 110 may be a single-pole double-throw switch, and may be controlled by the control processing module 130 through a control signal, which determines whether the input signal is connected to the external sensor charge signal or the internal calibration charge generating module 140.
In another preferred embodiment of the present invention, the charge signal conditioning module 120 may include a charge-to-voltage conversion module 121, an amplifying and filtering module 122, and an AD conversion module 123, wherein an input end of the charge-to-voltage conversion module 121 is connected to an output end of the analog switch module 110, an output end of the charge-to-voltage conversion module 121 is connected to an input end of the amplifying and filtering module 122, an output end of the amplifying and filtering module 122 is connected to an input end of the AD conversion module 123, and an output end of the AD conversion module 123 is connected to an input end of the control processing module 130.
The charge-to-voltage conversion module 121 may be configured to convert the received charge signal into a voltage signal and output the voltage signal after the conversion process to the amplification filtering module 122.
The amplifying and filtering module 122 may be configured to receive the voltage signal after the conversion processing, perform an amplifying and filtering processing on the voltage signal after the conversion processing, and output the voltage signal after the amplifying and filtering processing to the AD conversion module 123.
The AD conversion module 123 may be configured to receive the amplified and filtered voltage signal, perform analog-to-digital conversion on the amplified and filtered voltage signal, and output the analog-to-digital converted voltage signal to the control processing module 130.
In another preferred embodiment of the present invention, the correction charge generation module 140 includes a voltage-to-charge conversion module 141, a low pass filter module 142 and a DA conversion module 143, wherein an input terminal of the DA conversion module 143 is connected to an output terminal of the control processing module 130, an output terminal of the DA conversion module 143 is connected to an input terminal of the low pass filter module 142, an output terminal of the low pass filter module 142 is connected to an input terminal of the voltage-to-charge conversion module 141, and an output terminal of the voltage-to-charge conversion module 141 is connected to an input terminal of the analog switch module 110.
The DA conversion module 143 may be configured to perform analog-to-digital conversion processing on the received charge signal output by the control processing module 130, and output the analog-to-digital converted charge signal to the low-pass filtering module 142.
The low pass filtering module 142 may be configured to receive the analog-to-digital conversion processed charge signal, perform signal selection and filtering processing on the analog-to-digital conversion processed charge signal, and output the filtered charge signal to the voltage charge converting module 141.
The voltage-to-charge conversion module 141 may be configured to receive the filtered charge signal, perform voltage-to-charge conversion processing on the filtered charge signal, and output the converted charge signal to the analog switch module 110.
The following describes the charge amplifier 100 according to an embodiment of the present invention with reference to a circuit diagram.
Referring to fig. 2, a schematic diagram of a circuit corresponding to a charge amplifier according to an embodiment of the present invention is shown, as shown in fig. 2, the charge-to-voltage conversion module 121 includes a first diode D1, a second diode D2, a first operational amplifier U1, a first resistor R1, and a first capacitor C1, an inverting input terminal of the first operational amplifier U1 is connected to an anode terminal of the first diode D1, a cathode terminal of the second diode D2, a pin of the analog switch module 110, and one end of the first resistor R1 and one end of the first capacitor C1, a non-inverting terminal of the first operational amplifier U1, a cathode terminal of the first diode D1, and an anode terminal of the second diode D2 are grounded, and an output terminal of the first operational amplifier U1 is connected to the other end of the first resistor R1 and the first capacitor C1.
The first diode D1 and the second diode D2 may be configured to perform a clipping process on the input signal.
A first resistor R1 configured to provide a dc path to the first operational amplifier U1.
A first capacitor C1 configured to convert an input charge signal into a voltage signal.
When the input charge amount is Q, the output voltage of the charge-voltage conversion module 121 is V = Q/C1.
The charge signal conditioning module 120 may include a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, and a second operational amplifier U2, wherein one end of the fourth resistor R4 is connected to the output end of the first operational amplifier U1, the other end of the fourth resistor R4 is connected to one end of the second capacitor C2 and one end of the fifth resistor R5, the other end of the fifth resistor R5, one end of the third capacitor C3, and the non-inverting end of the second operational amplifier U2, the other end of the third capacitor C3 is grounded to one end of the second resistor R2, the other end of the second resistor R2 and one end of the third resistor R3 are connected to the inverting end of the second operational amplifier U2, and the other end of the third resistor R3 is connected to the output end of the second operational amplifier U2.
The fourth resistor R4, the fifth resistor R5, the second capacitor C2, the third capacitor C3 and the second operational amplifier U2 together form a second-order active low-pass filter, and may also be designed as a band-pass filter according to the frequency band of the external sensor, and the second resistor R2 and the third resistor R3 are used to set the voltage amplification gain (G =1+ R3/R2).
The control processing module 130 includes a control processing unit U3, the control processing unit U3 may be an STM32MCU, and the control processing unit U3 has an AD module and a DA module built therein and has a plurality of IO interfaces.
The built-in AD module is connected to the output of a second operational amplifier U2 in the amplification and filtering circuit through a sixth resistor R6, and the built-in DA module outputs to a low-pass filter consisting of a seventh resistor R7 and a fourth capacitor C4. The control processing unit U3 can here perform three functions: 1) Sampling the output signal of the charge conditioning circuit module 120 for subsequent processing; 2) Controlling the analog switch module 110 to input a signal source and determining whether the current mode is a normal working mode or a correction test mode; 3) And outputting a signal waveform required in the correction test mode. It should be noted that if the AD module and the DA module built in the control processing module U3 cannot meet the precision requirement, an independent AD module and an independent DA module may also be used, and the MCU here may also be changed to a DSP or an FPGA module as needed.
One end of the seventh resistor R7 is connected to the output end of the DA module, the other end of the seventh resistor R7 is connected with one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded.
The low-pass filtering module 142 may be a passive first-order RC filter, and if the requirement for the smoothness of the output signal waveform is high, it may be designed as a multi-order active low-pass filter as required.
The voltage-to-charge conversion module 141 includes a fourth operational amplifier U4 and a fifth capacitor R5, a non-inverting input terminal of the fourth operational amplifier U4 is connected to one end of the fourth capacitor R4 and the other end of the seventh resistor R7, an inverting input terminal of the fourth operational amplifier U4 is connected to the output terminal and to one end of the fifth capacitor R5, and the other end of the fifth capacitor R5 is connected to one end of the analog switch module 110.
The fourth operational amplifier U4 realizes a following buffer function, so that an input signal becomes a low impedance output, and at the same time, the driving capability is enhanced. The fifth capacitor C5 is responsible for converting the input voltage signal into an electric charge signal, and according to the principle, Q = CU, that is, the electric charge Q carried by the capacitor is the product of the capacitance of the capacitor and the voltage U between the two electrodes of the capacitor. The value of the fifth capacitor C5 should be equal to the equivalent capacitance of the external piezoelectric sensor, and in order to meet the accuracy requirement, a high-accuracy ceramic NPO capacitor with temperature compensation characteristics should be selected.
It can be seen from the above that the calibration test of the charge amplifier 100 can be realized by the present embodiment only by adding a limited number of devices (the seventh resistor R7, the fourth capacitor C4, the fifth capacitor C5, and the fourth operational amplifier U4), and the present embodiment has the characteristics of low cost, strong applicability, and the like.
According to the charge amplifier provided by the embodiment of the invention, the control processing module controls the on-off switching of the analog switch module, and the correction test of the charge amplifier can be realized only by adding a limited number of devices, so that the correction test of the charge amplifier can be automatically completed without connecting external test equipment, the cost of the correction test is reduced, and the test time is saved.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. A charge amplifier, comprising: the device comprises an analog switch module, a charge signal conditioning module, a correction charge generation module and a control processing module, wherein the input end of the analog switch module is connected with the control processing module, the output end of the analog switch module is connected with the input end of the charge signal conditioning module, the output end of the charge signal conditioning module is connected with the input end of the control processing module, and the input end of the correction charge generation module is connected with the output end of the control processing module; wherein,
the analog switch module is configured to receive a first control signal output by the control processing module in a normal working state, and perform switch switching according to the first control signal so as to connect the input end of the analog switch module with the output end of an external sensor; in a correction test state, receiving a second control signal output by the control processing module, and switching according to the second control signal to connect the input end of the analog switch module with the output end of the correction charge generation module;
the charge signal conditioning module is configured to receive a first charge signal output by the external sensor through the analog switch module, process the first charge signal, and output the processed first charge signal to the control processing module in a normal working state; under the correction test state, receiving a correction charge signal output by the correction charge generation module, processing the correction charge signal, and outputting the processed correction charge signal to the control processing module;
the correction charge generation module is configured to receive a second charge signal output by the control processing module, perform correction processing on the second charge signal, generate a correction charge signal, and output the correction charge signal to the charge signal conditioning module through the analog switch module in a correction test state;
the control processing module is configured to generate the first control signal and output the first control signal to the analog switch module in a normal working state, and control the analog switch module to perform switch switching so as to connect an input end of the analog switch module with an output end of an external sensor and receive a processed first charge signal output by the charge signal conditioning module; and under a correction test state, generating the second control signal, outputting the second control signal to the analog switch module, controlling the analog switch module to switch so as to control the input end of the analog switch module to be connected with the output end of the correction charge generation module, outputting the second charge signal to the correction charge generation module, and receiving the processed correction charge signal output by the charge signal conditioning module.
2. The charge amplifier of claim 1, wherein the analog switch module is a single pole double throw switch.
3. The charge amplifier according to claim 1, wherein the charge signal conditioning module comprises a charge-to-voltage conversion module, an amplifying and filtering module and an AD conversion module, an input terminal of the charge-to-voltage conversion module is connected to an output terminal of the analog switch module, an output terminal of the charge-to-voltage conversion module is connected to an input terminal of the amplifying and filtering module, an output terminal of the amplifying and filtering module is connected to an input terminal of the AD conversion module, and an output terminal of the AD conversion module is connected to an input terminal of the control processing module; wherein,
the charge-voltage conversion module is configured to convert the received charge signal into a voltage signal and output the converted voltage signal to the amplification filtering module;
the amplifying and filtering module is configured to receive the voltage signal after the conversion processing, perform amplifying and filtering processing on the voltage signal after the conversion processing, and output the voltage signal after the amplifying and filtering processing to the AD conversion module;
the AD conversion module is configured to receive the voltage signal after the amplification and filtering processing, perform analog-to-digital conversion processing on the voltage signal after the amplification and filtering processing, and output the voltage signal after the analog-to-digital conversion processing to the control processing module.
4. The charge amplifier according to claim 3, wherein the correction charge generation module comprises a voltage-to-charge conversion module, a low-pass filter module and a DA conversion module, an input terminal of the DA conversion module is connected to an output terminal of the control processing module, an output terminal of the DA conversion module is connected to an input terminal of the low-pass filter module, an output terminal of the low-pass filter module is connected to an input terminal of the voltage-to-charge conversion module, and an output terminal of the voltage-to-charge conversion module is connected to an input terminal of the analog switch module; wherein,
the DA conversion module is configured to perform analog-to-digital conversion processing on the received charge signal output by the control processing module and output the charge signal after analog-to-digital conversion processing to the low-pass filtering module;
the low-pass filtering module is configured to receive the charge signal after analog-to-digital conversion processing, perform signal selection and filtering processing on the charge signal after analog-to-digital conversion processing, and output the charge signal after filtering processing to the voltage-to-charge conversion module;
the voltage-charge conversion module is configured to receive the filtered charge signal, perform voltage-charge conversion processing on the filtered charge signal, and output the converted charge signal to the analog switch module.
5. The charge amplifier of claim 4, wherein the charge-to-voltage conversion module comprises a first diode, a second diode, a first operational amplifier, a first resistor and a first capacitor, wherein the inverting input terminal of the first operational amplifier is connected to the anode terminal of the first diode, the cathode terminal of the second diode, the pin of the analog switch module, one terminal of the first resistor and one terminal of the first capacitor, the non-inverting terminal of the first operational amplifier, the cathode terminal of the first diode and the anode terminal of the second diode are grounded, and the output terminal of the first operational amplifier is connected to the other terminals of the first resistor and the first capacitor; wherein,
the first diode and the second diode are configured to perform amplitude limiting processing on an input signal;
the first resistor configured to provide a DC path to the first operational amplifier;
the first capacitor is configured to convert an input charge signal into a voltage signal.
6. The charge amplifier of claim 5, wherein the charge signal conditioning module comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor, a third capacitor, and a second operational amplifier, one end of the fourth resistor is connected to the output terminal of the first operational amplifier, the other end of the fourth resistor is connected to one end of the second capacitor and one end of the fifth resistor, the other end of the fifth resistor, one end of the third capacitor, and the non-inverting terminal of the second operational amplifier, the other end of the third capacitor is connected to one end of the second resistor, the other end of the second resistor, one end of the third resistor, and the other end of the third resistor are connected to the inverting terminal of the second operational amplifier, and the other end of the third resistor is connected to the output terminal of the second operational amplifier.
7. The charge amplifier according to claim 6, wherein the control processing module comprises a control processing unit, the control processing unit is provided with a plurality of IO interfaces and has an AD module and a DA module built therein; wherein,
the AD module is connected to the output end of the second operational amplifier through a sixth resistor, and the output end of the DA module is connected to a low-pass filtering module consisting of a seventh resistor and a fourth capacitor.
8. The charge amplifier of claim 7, wherein one end of the seventh resistor is connected to the output end of the DA module, the other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.
9. The charge amplifier of claim 8, wherein the low pass filtering module is a passive first order RC filter.
10. The charge amplifier of claim 8, wherein the voltage-to-charge conversion module comprises a fourth operational amplifier and a fifth capacitor, a non-inverting input terminal of the fourth operational amplifier is connected to one terminal of the fourth capacitor and the other terminal of the seventh resistor, an inverting input terminal of the fourth operational amplifier is connected to an output terminal and to one terminal of the fifth capacitor, and the other terminal of the fifth capacitor is connected to one terminal of the analog switch module.
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| AT388830B (en) * | 1988-01-25 | 1989-09-11 | Avl Verbrennungskraft Messtech | CHARGE AMPLIFIER CIRCUIT |
| JP4534714B2 (en) * | 2004-10-22 | 2010-09-01 | 株式会社デンソー | Charge amplifier circuit |
| US7859352B2 (en) * | 2008-10-15 | 2010-12-28 | Honeywell International Inc. | Systems and methods to overcome DC offsets in amplifiers used to start resonant micro-electro mechanical systems |
| CN103913192B (en) * | 2014-03-31 | 2016-02-03 | 中国工程物理研究院总体工程研究所 | A kind of electric charges amplify sing1e unit calibration device and calibration steps |
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2018
- 2018-11-28 CN CN201811436258.0A patent/CN109617534B/en active Active
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