Capacitive ECG Circuit with Fast Recovery for Continuous Exercise Monitoring.

To detect electrophysiological signals on clothing through capacitive electrocardiogram(cECG), the front-end amplifier must possess a very high impedance to effectively capture ECG information. However, the trade-off for high impedance and capacitive coupling is the introduction of large time constants, making cECG more susceptible to interference from electrostatic charges and motion artifacts. In instances where artifacts reach levels sufficient to saturate the preamplifier, a considerable amount of time (up to tens of seconds) is required to restore the circuit to its normal detection voltage.