用于低电平电压测量的纳伏特放大器

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings Pub Date : 2012-05-13 DOI:10.1109/I2MTC.2012.6229660

G. Cannatà, G. Scandurra, C. Ciofi

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引用次数: 2

摘要

提出了一种利用时变电阻作为探头检测串并联反馈结构运算放大器等效输入偏置的符号和幅值的偏置校正系统的新设计。时变传感电阻由MOS实现，通过采用适当的离散时间采样策略进行偏移误差检测，大大减少了电荷注入问题。显著的设计结果包括有效放大器带宽从几Hz扩展到大约100 Hz，增益从201提升到1001。利用这种新方法，获得了几十nV量级的剩余偏置，使我们能够将系统分类为纳伏放大器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nanovoltmeter amplifier for low level voltage measurements

A new design of an offset correction system that employs a time varying resistance as a probe for detecting the sign and magnitude of the equivalent input offset of an operational amplifier in a series-shunt feedback configuration is proposed. The time varying sense resistor is implemented by a MOS for which the problem of charge injection is considerably reduced by resorting to a proper discrete time sampling strategy for offset error detection. Significant design results include the extension of the useful amplifier bandwidth from a few Hz up to about one hundred Hz with a gain boost from 201 to 1001. With the new approach, a residual offset in the order of a few tens of nV is obtained which allows us to classify the system as a nanovolt amplifier.

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2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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