A pseudo rail-to-rail chopper-stabilized instrumentation amplifier in 0.13 µm CMOS

Abstract

This paper presents a CMOS chopper-stabilized instrumentation amplifier based on a compact differential difference amplifier (DDA). The DDA itself is based on a high gain and robust two-stage class-AB amplifier. Simulation results show that with chopping frequency at 250 KHz, both the noise density and offset can be reduced by a factor of 10. Detailed practical application considerations of the proposed In-Amp as a current-sensing amplifier in a power management chip are presented.