A Dual Loop 8-Channel ECG Recording System with Fast Settling Mode

This paper presents a dual-loop 8-channel ECG recording system with fast settling mode for 12-lead application. It employs frequency division multiplexing (FDM) technique to achieve multi-channel IA (MCIA). This leads to smaller area due to the use of smaller input capacitors and sharing of PGA, buffer and ADC. To suppress the DC offset of bio-potential signal, dual DC servo loops are proposed. A fast settling loop can be enabled to shorten the settling time from 14s down to only 0.6 s. The MCIA achieves 113.2-dB CMRR, 113-dB PSRR, and 1.44-µVrmsnoise performance. The MCIA occupies only 0.3 mm2 and consumes 60 µW for 8 channels. The whole ECG recording system was implemented in 130 nm CMOS technology.