一种小信号放大测量电路的设计

针对在恶劣工作环境中微弱信号无法准确测量的情况，设计了一种以高精度仪表放大器AD623为核心器件的放大测量电路，实现了对0mV～25mV范围内电压信号的精准放大，同时采用高精度光隔离器ACPL-C87B，隔离测量端对采集端的影响。经试验测量，该小信号放大测量电路能达到百分之一精度，此外该电路还具有抑制共模干扰、抑制温漂、稳定性好、抗干扰性强等特点。...

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Bibliographic Details
Published in电测与仪表 Vol. 52; no. 4; pp. 96 - 100
Main Author 甄国涌 储俊
Format Journal Article
LanguageChinese
Published 中北大学电子测试技术国家重点实验室，太原030051 2015
仪器科学与动态测试教育部重点实验室，太原030051%中北大学电子测试技术国家重点实验室,太原,030051
Subjects
ACPL-C87B
塞林更滤波器
小信号
误差分析
高精度仪表放大器（AD623）
高精度线性光耦（HCNR201）
塞林更滤波器
HCNR201
ACPL-C87B
error analysis
小信号
AD623
Sallen-Key filter
高精度仪表放大器(AD623)
高精度线性光耦(HCNR201)
误差分析
weak-signal
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ISSN1001-1390

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Summary:针对在恶劣工作环境中微弱信号无法准确测量的情况，设计了一种以高精度仪表放大器AD623为核心器件的放大测量电路，实现了对0mV～25mV范围内电压信号的精准放大，同时采用高精度光隔离器ACPL-C87B，隔离测量端对采集端的影响。经试验测量，该小信号放大测量电路能达到百分之一精度，此外该电路还具有抑制共模干扰、抑制温漂、稳定性好、抗干扰性强等特点。
Bibliography:Zhen Guoyong, Chu Jun （ 1. National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China. 2. Key Laboratory of Instrumentation Science ＆ Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China）
23-1202/TH
In view of the fact that weak signals cannot be accurately measured in the poor working environment, this paper proposed an amplifying measurement circuit which had the high-precision instrumental amplifier AD623 as the core device.This design could accurately amplify the voltage signals ranging from 0mV to 25mV and it also adopted a high-precision optical isolator ACPL-C87B to isolate the effect of the measuring end on the collection end.Through practical tests, it was verified that the weak-signal amplifying measurement circuit could achieve the accuracy of one percent and it also had the characteristics of suppressing common mode interference, suppressing temperature drifting, good stability and strong anti-interference.
A
ISSN:1001-1390