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Charge amplifier

A charge amplifier, voltage amplification technology, applied in charge amplifiers, amplifiers, improving amplifiers to reduce noise effects, etc., can solve the problems of unadjustable output signals, high noise of charge amplifiers, and inability to directly connect digital circuits, achieving wide adaptability , Improve the signal-to-noise ratio, easy to use effect

Inactive Publication Date: 2015-01-07
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems of the existing charge amplifiers, such as high noise, non-adjustable output signal, and inability to directly connect with digital circuits such as microcontrollers, and provide an extremely low-noise, adjustable output signal amplitude, adjustable output signal bandwidth, Charge amplifier with both analog and digital outputs

Method used

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Embodiment Construction

[0020] Referring to the accompanying drawings, the present invention will be further described in detail with specific embodiments.

[0021] like figure 1 As shown, the output terminal of the piezoelectric sensor 1 is connected to the charge-to-voltage module 2, the adjustable voltage amplification module 3 is connected to the charge-to-voltage module 2, the adjustable low-pass filter module 4 is connected to the adjustable voltage amplification module 3, and the AD conversion The module 5 is connected to the adjustable low-pass filter module 4 , the microcontroller 6 is connected to the AD conversion module 5 , the communication interface module 7 is connected to the microcontroller 6 , and the analog output interface module 8 is connected to the adjustable low-pass filter module 4 .

[0022] The amount of charge output by the piezoelectric sensor 1 is converted into a voltage amount by the charge-to-voltage module 2, amplified to a certain range by the adjustable voltage amp...

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Abstract

The invention relates to a charge amplifier, and aims at solving the technical problems of the existing charge amplifier that the noise is large, an output signal cannot be adjusted, and a microcontroller and other digital circuits cannot be directly connected. The charge amplifier comprises a charge-to-voltage module, an adjustable voltage amplifying module, an adjustable low-pass filter module, an AD converting module and an analog output interface module; the adjustable voltage amplifying module is connected with the charge-to-voltage module; the adjustable low-pass filter module is connected with the adjustable voltage amplifying module; the AD converting module and the analog output interface module are respectively connected with the adjustable low-pass filter module. The charge amplifier can be widely applied to the converting and amplifying process of charge quantity signals.

Description

technical field [0001] The invention relates to a signal processing circuit, in particular to a charge amplifier. Background technique [0002] At present, when capacitive sensors such as piezoelectric acceleration sensors, pressure sensors, and piezoelectric hydrophones are working, the output is proportional to the measured physical quantity, and has good linearity. However, the generated charges are relatively weak, so a charge amplifier is needed to convert and amplify the generated charges. [0003] The Chinese invention patent with application number 201310700690.7 and application publication number CN 103633956A discloses a charge amplifier, which has the following three defects: [0004] (1) Place the low-pass filter circuit before the power amplifier circuit, because the low-pass filter circuit itself will also generate noise, and the noise will be amplified after passing through the power amplifier circuit, which will affect the signal-to-noise ratio of the output...

Claims

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Application Information

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IPC IPC(8): H03F3/70
CPCH03F1/26H03F3/70H03F2200/372
Inventor 史振国王建强张永臣张凯乔秋晓于娟何春芝田玮
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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