Session 20-3

A Chopper and Auto-Zero Offset-Stabilized CMOS Instrumentation Amplifier

 

Abstract

This paper describes a CMOS instrumentation amplifier with a noise density of 42nV/√Hz and 640kHz GBW at 325microamp supply current. It achieves 2.5microvolt input offset voltage, 130dB CMRR, and 114dB PSRR by the combined use of chopping, auto-zeroing and a current-feedback topology.