JSSC 2025第3期RF & Wireless0.18μmNeural Network Accelerator

A1 8 - G Input-Impedance 015-μV Input-Referred- Ripple Chopper Ampliﬁer With Lo

提出一种采用局部正反馈环的斩波放大器，实现高输入阻抗和低输入纹波。

0.18μm CMOS, 5V供电, 1.07mA电流, 1.8GΩ输入阻抗, 0.15μV输入纹波

斩波放大器电流反馈仪表放大器局部正反馈纹波抑制SAR校准

▸采用局部正反馈环(LPFL)提升输入阻抗

▸通过无源高通滤波结合SAR辅助校准抑制斩波纹波

▸可重构为通用运算放大器的多路径电流反馈架构

Abstract

This article presents a chopper-stabilized multipath current-feedback instrumentation ampliﬁer (CFIA) that can also be reconﬁgured to a general-purpose operational ampliﬁer (OPA). By utilizing a local positive feedback loop (LPFL), both the CFIA and the OPA beneﬁt from gain-independent impedance boosting while retaining the merits of chopping, i.e., low noise and low offset. In addition, the chopping-induced ripple, one of the main issues of conventional chopper ampliﬁers, is suppressed by a pas