| 一种小信号放大测量电路的设计 |
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| 引用本文： | 甄国涌,储俊.一种小信号放大测量电路的设计[J].电测与仪表,2015,52(4). |
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| 作者姓名： | 甄国涌 储俊 |
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| 作者单位： | 1. 中北大学电子测试技术国家重点实验室，太原030051; 仪器科学与动态测试教育部重点实验室，太原030051
2. 中北大学电子测试技术国家重点实验室,太原,030051 |
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| 摘 要： | 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0m V~25m V范围内电压信号的精准放大,同时采用高精度光隔离器ACPLC87B,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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| 关 键 词： | 高精度仪表放大器(AD623) 小信号 高精度线性光耦(HCNR201) 塞林更滤波器 ACPL-C87B 误差分析 |
| 收稿时间： | 2014/3/26 0:00:00 |
| 修稿时间： | 2014/5/7 0:00:00 |
Design of the measurement circuit about weak-signal amplifying |
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| Zhen Guoyong and chujun.Design of the measurement circuit about weak-signal amplifying[J].Electrical Measurement & Instrumentation,2015,52(4). |
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| Authors: | Zhen Guoyong and chujun |
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| Affiliation: | National Key Laboratory for Electronic Measurement Technology,North University of China Taiyuan,North University of China |
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| Abstract: | According to the fact that weak signals can not be accurately measured in the poor working environment,this paper proposed a high precision measurement circuit based on high accuracy instrumentation amplifier AD623,and can accurately amplify voltage signal ranged from 0mV to 25mV. The design also used a Precision optical isolator ACPL-C87B to isolate the affection of measurement to the collection.Through practical test, the weak-signal measurement circuit can achieve the accuracy of two percent. Also,the circuit has the characteristics of suppressing common mode interference, suppressing drifting, good stability and good ability of interference. |
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| Keywords: | AD623 weak-signal HCNR201 Sallen-Key filter ACPL-C87B error analysis |
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