A Dynamic Instrumentation Amplifier for Low-Power and Low-Noise Biopotential Acquisition.

A low-power and low-noise dynamic instrumentation amplifier (IA) for biopotential acquisition is presented. A dynamic IA that can reduce power consumption with a timely piecewise power-gating method, and noise level with an alternating input and chopper stabilization technique is fabricated with a 0.13-mu m CMOS. Using the reconfigurable architecture of the IA, various combinations of the low-noise schemes are investigated. The combination of power gating and chopper stabilization shows a lower noise performance than the combination of power gating and alternating input switching scheme. This dynamic IA achieved a power reduction level of 50% from 10 mu A to 5 mu A and a noise reduction of 90% from 9.1 mu Vrms to 0.92 mu Vrms with the combination of the power gating and chopper stabilization scheme.