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JSSC 2011第12期Other0.7μm

A Current-Feedback Instrumentation Amplifier With a Gain Error Reduction Loop and

提出一种具有增益误差减少环的高精度电流反馈仪表放大器,适用于微弱信号处理。
0.7μm CMOS, 5V, 290μA, 0.06%增益误差, 5ppm INL
电流反馈仪表放大器增益误差动态元件匹配功率效率CMOS
创新点1:采用动态元件匹配(DEM)技术显著提高增益精度,通过动态切换输入和反馈跨导器的元件匹配,将未调整的最大增益误差降低至0.06%,同时改善增益漂移和线性度(方法创新)
创新点2:引入自动增益误差减少环(GERL)动态消除跨导器失配,无需传统 trimming 技术即可抑制 DEM 引起的输出纹波,实现 5-ppm INL 的高线性度(系统级创新)
创新点3:使用简单差分对结构替代电阻退化级设计,在保证增益精度的同时提升功率效率,功耗仅290μA@5V,噪声效率因子(NEF)达11.2(电路结构创新)
创新点4:整体架构实现127dB超高共模抑制比(CMRR)和3μV输入失调电压,适用于μV级传感器信号处理(性能指标突破)
Abstract
This paper presents a power-efficient current-feed- back instrumentation amplifier (CFIA) with high gain accuracy. It is intended for interfacing precision bridge transducers and thermocouples that output -level signals. The gain accuracy of the CFIA is mainly limited by the mismatch of two transcon- ductors. Applying dynamic element matching (DEM) to them ensures good gain accuracy, gain drift, and linearity. As a result, these transconductors can be implemented as simple differential pairs, resu