US 11,937,947 B2
Low-noise biopotential acquisition system for dry electrode application
Chih-Hsin Chen, Hsinchu (TW)
Assigned to MEDIATEK INC., Hsin-Chu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Apr. 1, 2021, as Appl. No. 17/219,910.
Claims priority of provisional application 63/014,749, filed on Apr. 24, 2020.
Prior Publication US 2021/0330267 A1, Oct. 28, 2021
Int. Cl. A61B 5/00 (2006.01)
CPC A61B 5/7221 (2013.01) 9 Claims
OG exemplary drawing
 
1. A circuitry of a biopotential acquisition system, comprising:
an input node, configured to receive an input signal from an electrode of the biopotential acquisition system;
an electrode-tissue impedance (ETI) transmitter, configured to generate a transmitter signal;
a capacitor, wherein a first node of the capacitor is coupled to the ETI transmitter, and a second node of the capacitor is coupled to the input node; and
an ETI receiver, coupled to the input node, configured to receive the transmitter signal from the input node to generate an ETI;
wherein the ETI transmitter comprises:
a digital-to-analog converter (DAC), configured to receive a digital input signal to generate the transmitter signal; and
a filter, configured to filter the transmitter signal to generate a filtered transmitter signal to the first node of the capacitor, wherein the input node of the circuitry receives the filtered transmitter signal from the second node of the capacitor.