US 11,986,306 B2
Direct sampling electrode-tissue impedance system and associated signal processing method
Chih-Hsin Chen, Hsinchu (TW)
Assigned to MEDIATEK INC., Hsin-Chu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Jul. 4, 2021, as Appl. No. 17/367,409.
Claims priority of provisional application 63/145,553, filed on Feb. 4, 2021.
Claims priority of provisional application 63/075,851, filed on Sep. 9, 2020.
Prior Publication US 2022/0071543 A1, Mar. 10, 2022
Int. Cl. A61B 5/308 (2021.01); A61B 5/00 (2006.01); A61B 5/0531 (2021.01); A61B 5/28 (2021.01); A61B 5/318 (2021.01)
CPC A61B 5/308 (2021.01) [A61B 5/0531 (2013.01); A61B 5/28 (2021.01); A61B 5/318 (2021.01); A61B 5/721 (2013.01); A61B 2560/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A circuitry of a biopotential acquisition system, comprising:
an input node, wherein the input node is coupled to an electrode of the biopotential acquisition system, and the electrode is configured to be in contact with a human body;
an electrode-tissue impedance (ETI) transmitter, configured to generate a transmitter signal to the input node;
an analog front-end circuit, coupled to the input node, configured to process an input signal from the input node to generate a digital signal, wherein each of the input signal and the digital signal comprises components of an electrocardiography (ECG) signal and an ETI signal;
a digital filter, configured to filter the digital signal to generate the ECG signal; and
a digital mixer, configured to mix the digital signal with mixer data to generate an in-phase mixed signal and a quadrature mixed signal, wherein the mixer data corresponds to a frequency of the transmitter signal, and the in-phase mixed signal and the quadrature mixed signal comprise the components of the ETI signal.