A high CMRR, high resolution bio-ASIC for ECG signals

Abstract

A High CMRR, High-resolution signal processing bioASIC circuit for wireless and wearable systems is presented. The chip consists of High CMRR Instrumentation Amplifier (IA) integrated with high accuracy pipeline ADC. The bio-ASIC front-end is built using current balance IA circuit followed by high pass and low pass filters. A High resolution, wide dynamic range, integrated Pipeline ADC allows input swing of ±1V. The ASIC is fabricated in 0.13μm CMOS process technology. The measured CMRR and integrated input referred noise of the circuit is 176dB at 150Hz and 4.5μν over the bandwidth of 0.1–150Hz. The Input Common Mode Range (ICMR) is 0–1.65V and the dynamic range is ±5mV. The ADC offers ENOB of 12.8 at 6 MSPS sampling speed & ± 0.75LSB of differential nonlinearity. The power consumption of the Instrumentation amplifier circuit is 33μW with a 3.3V supply.