US 12,206,437 B2
Time-division multiplexing-based multi-channel electrocardiogram measurement apparatus robust against power line interference and electrocardiogram measurement method using the same
Jae Yoon Sim, Pohang-si (KR); and Kyu Jin Choi, Pohang-si (KR)
Assigned to POSTECH ACADEMY-INDUSTRY FOUNDATION, Pohang-si (KR)
Filed by POSTECH ACADEMY-INDUSTRY FOUNDATION, Pohang-si (KR)
Filed on Nov. 16, 2022, as Appl. No. 17/988,696.
Claims priority of application No. 10-2022-0127152 (KR), filed on Oct. 5, 2022.
Prior Publication US 2024/0120938 A1, Apr. 11, 2024
Int. Cl. H03M 3/00 (2006.01); H03M 1/80 (2006.01)
CPC H03M 3/474 (2013.01) [H03M 1/802 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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.