A micropower analogue front end for wireless ECG system

Abstract

ABSTRACTRecently, the growing demand of low power, low noise and miniaturised size for biopotential integrated front end have drawn a lot of research interests. This paper proposed an analogue front end for wireless ECG system. It consists of a capacitively coupled chopper instrumentation amplifier (CCIA), chopper spike filter (CSF), band-pass filter and clock generator. 1/f noise and offset of the first stage are filtered by the chopping technology. The spikes generated by the input chopper of CCIA are filtered by the CSF. The band-pass filter sets the bandwidth of the front end. The front end was implemented in a 0.13-m complementary metal-oxide-semiconductor process. It achieves 46.3 dB gain, 100 dB common mode rejection ratio and 5 A current consumption. Meanwhile, other state-of-the-art performances in terms of input common mode, dc-electrode offset and noise were also achieved with a chip area of 0.075 mm2. The results prove that the chip has the possibility to apply into the wireless ECG system for long-term homecare.