Circuit for eliminating signal offset of charge amplifier

A technology of charge signal and voltage signal, which is applied in charge amplifiers, components of electrical measuring instruments, and measurement of electrical variables, etc. It can solve problems such as limited use scenarios, variable input signals, and exceeding the range of the amplifier.

Pending Publication Date: 2021-10-08
佛山市卓膜科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This type of amplifier often requires the input signal to be a stable and regular signal, but because the charge input signal is easily affected by changes in electromagnetic waves, ambient temperature, humidity, etc., the input signal changes indefinitely, which limits its use scenarios
For example, when the input signal has a certain offset

Method used

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  • Circuit for eliminating signal offset of charge amplifier
  • Circuit for eliminating signal offset of charge amplifier
  • Circuit for eliminating signal offset of charge amplifier

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Embodiment Construction

[0049] In order to better illustrate the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0050] It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the embodiments of the present application.

[0051] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "said" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It shoul...

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Abstract

The invention discloses a circuit for eliminating the signal offset of a charge amplifier, and the circuit comprises: a front circuit module which is used for outputting a first voltage signal according to a first charge signal; a monitoring circuit module which is used for outputting a monitoring signal according to the first voltage signal; a control module which is used for outputting a first control signal when the monitoring signal meets a preset condition; a sampling hold circuit module which is used for outputting an offset signal according to the first control signal and the first voltage signal and keeping the size of the offset signal unchanged within a certain time, wherein the control module is also used for controlling the measuring equipment to carry out variable testing, and the front circuit module is also used for outputting a second voltage signal to the subtraction circuit module according to the second charge signal; and a subtraction circuit module which is used for outputting a variable signal according to the second voltage signal and the offset signal, wherein by adopting the circuit provided by the invention, the offset of the charge amplifier can be effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of piezoelectric coefficient measurement, in particular to a circuit for eliminating the signal offset of a charge amplifier. Background technique [0002] The existing charge amplifier generally consists of a charge conversion circuit, an amplification circuit, a filter circuit, an overload indicator, a regulated power supply, and the like. [0003] This type of amplifier often requires the input signal to be a stable and regular signal, but because the charge input signal is easily affected by changes in electromagnetic waves, ambient temperature, humidity, etc., the input signal varies, which limits its use scenarios. For example, when the input signal has a certain offset to the ground, the amplifier will amplify the offset at the same time. When the offset is small, the output will not be affected; however, when the offset is large to a certain extent, the input signal After being amplified, it is over...

Claims

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Application Information

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IPC IPC(8): H03F3/70G01R29/22G01R1/30
CPCH03F3/70G01R29/22G01R1/30
Inventor 罗立寿陈显锋
Owner 佛山市卓膜科技有限公司
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