A 45-V Auto-Zero-Stabilized Chopper Instrumentation Amplifier With 1.8- μ V Offset, 33.5- μ V Ripple, and 42-V Common-Mode Input Range

IF 2 Q3 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE

IEEE Solid-State Circuits Letters Pub Date : 2025-06-04 DOI:10.1109/LSSC.2025.3576393

Jiahao Wang;Shen Ye;Shiqi Zhang;Zhiliang Hong;Jiawei Xu

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引用次数: 0

Abstract

This letter presents a 45V high-precision current-feedback instrumentation amplifier (CFIA) that combines both chopping and auto-zeroing (AZ) to achieve 1.8-

$\mu $

V input offset (10 samples) and 33.5-

$\mu $

V input-referred ripple. The AZ is duty cycled to minimize power and silicon area, with a parallel auxiliary path operating during AZ to keep the amplifier functioning properly. To improve the limited input signal range of conventional CFIA, an input common-mode (CM) voltage tracking circuit improves the input common-mode voltage range (CMVR) up to 42 V and CMRR to 132-dB, respectively. Further combined with source degeneration resistors, the input differential-mode voltage range (DMVR) is also increased to 800mV at 1% THD. The CFIA is implemented in a standard 0.18-

$\mu $

m BCD process and consumes

$294.5~\mu $

A. This translates into a competitive efficiency in terms of GBW/supply current of 134 kHz/

$\mu $

查看原文本刊更多论文

45 V自动零稳定斩波仪表放大器，1.8 μ V失调，33.5 μ V纹波，42 V共模输入范围

这封信介绍了一个45V高精度电流反馈仪表放大器（CFIA），它结合了斩波和自动归零（AZ），以实现1.8- $\mu $ V的输入偏移（10个样本）和33.5- $\mu $ V的输入参考纹波。AZ是占空比的，以最大限度地减少功率和硅面积，在AZ期间有一个并行的辅助路径工作，以保持放大器正常工作。为了改善传统CFIA有限的输入信号范围，输入共模电压跟踪电路将输入共模电压范围（CMVR）和CMRR分别提高到42 V和132 db。进一步结合源退化电阻，输入差模电压范围（DMVR）也在1% THD时增加到800mV。CFIA在标准的0.18- $\mu $ m BCD工艺中实现，消耗$294.5~ $\mu $ a。这转化为GBW/电源电流为134 kHz/ $\mu $ a的竞争效率。

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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来源期刊

IEEE Solid-State Circuits Letters Engineering-Electrical and Electronic Engineering

CiteScore

4.30

自引率

3.70%

发文量