A Low Power Low Noise Cmos Amplifier for Portable Ecg Monitoring Application

A low power and low noise front end chopped instrumentation amplifier for portable electrocardiogram recording system is presented. The circuit is based on the chopper technique which is implemented using folded cascode structure that has significant lower power consumption than the predecessor’s approaches while keeping the performance unchanged. The chopper switches modulate noise from a low frequency into a higher frequency range, then demodulates back to original signal before filtering the unwanted effect by a low pass filter. The circuit is designed based on SILTERRA 0.18 μm CMOS technology process using VIRTUOSO CADENCE. The simulated results of the amplifier show ultra-low power of 5.51 μW and low noise of 17.2 μV/√Hz at 10 Hz. High differential voltage gain of 54.5 dB and 71 dB in CMRR are achieved.