Time-division multiplexing-based multi-channel electrocardiogram measurement apparatus robust against power line interference and electrocardiogram measurement method using the same

A time-division multiplexing (TDM)-based multi-channel electrocardiogram measurement apparatus robust against power line interference, comprising:

• a multi-channel measurement unit comprising a plurality of electrocardiogram measurement channels and configured to measure electrocardiogram of the plurality of electrocardiogram measurement channels by using a TDM method;
• a channel electrode offset (EDO) elimination unit configured to eliminate an EDO occurring in the multi-channel measurement unit;
• a common mode interference cancellation unit configured to cancel interference attributable to a power line around a body;
• an instrumentation amplifier configured to amplify an output signal of the multi-channel measurement unit;
• and
• an analog-to-digital converter configured to convert an analog signal of the instrumentation amplifier into a digital signal,
• wherein the EDO elimination unit comprises:
• a DC-servo filter configured to receive an output of the analog-to-digital converter and to output a code signal comprising information corresponding to an EDO;
• a digital-to-analog converter configured to convert an output signal of the DC-servo filter into an analog signal;
• coupling capacitors disposed between the multi-channel measurement unit and the instrumentation amplifier;
• and
• coupling switches configured to transmit the output signal of the digital-to-analog converter to the coupling capacitors, respectively.