A Time-Division Multiplexed 8-Channel Non-Contact ECG Recording IC with a Common-Mode Interference Tolerance of $20\mathrm{V}_{\text{PP}}$

There has been increasing demand for a low-power wearable device to perform long-term ambulatory monitoring of electrocardiogram (ECG). However, for a wearable device to be a convenient continuous recording system in one's daily routine, technical issues in ECG become more important. First, long-term monitoring should be robust against massive environmental interference. The interference affects the device in the form of common-mode interference (CMI) caused by coupled disturbances from surrounding powerlines. Common-mode charging/discharging at the input stage has been proposed in 2-electrode systems using switched capacitors [1] and current sources [2] to provide the effective function of a driven-right-leg (DRL) circuit.