A high CMRR low noise CMOS amplifier for electrocardiogram signal recording applications

Electrocardiogram signal and other biomedical signals are low frequency and low amplitude signals. This article proposes a high CMRR low noise wide linear output range biopotential CMOS amplifier for electrocardiogram signal recording applications and physiological measurement frontend. The wide linear output range is achieved by effectively combining the first-stage open-loop and the second-stage closed-loop configuration, and using additional gain enhancement switches. Due to the wide linear output range, the proposed amplifier shows a stable voltage gain of 46.3 dB for output range from 0.15 to 3.12 V and THD of 0.04% with a 15 mVpp input amplitude (all with 3.3 V supply).

کلیدواژه ها:

CMOS amplifier ، physiological measurement ، rail to rail ، biopotential amplifier