US 12,144,653 B2
Systems, circuits, and methods for reducing common-mode noise in biopotential recordings
Bruno Do Valle, Brighton, MA (US); Isai Olvera, San Jose, CA (US); and Ryan Field, Culver City, CA (US)
Assigned to HI LLC, Culver City, CA (US)
Filed by HI LLC, Los Angeles, CA (US)
Filed on Feb. 16, 2021, as Appl. No. 17/176,315.
Claims priority of provisional application 63/120,650, filed on Dec. 2, 2020.
Claims priority of provisional application 63/003,258, filed on Mar. 31, 2020.
Claims priority of provisional application 62/979,866, filed on Feb. 21, 2020.
Prior Publication US 2021/0259638 A1, Aug. 26, 2021
Int. Cl. A61B 5/00 (2006.01); A61B 5/28 (2021.01); A61B 5/291 (2021.01); A61B 5/297 (2021.01); A61B 5/305 (2021.01); A61B 5/308 (2021.01); A61B 5/31 (2021.01); A61B 5/313 (2021.01); A61B 5/315 (2021.01); A61B 5/318 (2021.01); A61B 5/369 (2021.01); A61B 5/389 (2021.01); H03F 3/45 (2006.01)
CPC A61B 5/7203 (2013.01) [A61B 5/0075 (2013.01); A61B 5/28 (2021.01); A61B 5/291 (2021.01); A61B 5/297 (2021.01); A61B 5/305 (2021.01); A61B 5/308 (2021.01); A61B 5/31 (2021.01); A61B 5/313 (2021.01); A61B 5/315 (2021.01); A61B 5/318 (2021.01); A61B 5/369 (2021.01); A61B 5/389 (2021.01); A61B 5/6803 (2013.01); A61B 5/7225 (2013.01); H03F 3/45475 (2013.01); H03F 2200/261 (2013.01); H03F 2203/45138 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A biopotential measurement system comprising:
a plurality of electrodes each configured to record a different signal included in a plurality of signals representative of electrical activity of a target within a user;
a plurality of non-inverting operational amplifier circuits each connected to a different electrode included in the plurality of electrodes and each configured to output a different amplified signal included in a plurality of amplified signals representative of amplified versions of the plurality of signals; and
a common-mode feedback circuit configured to:
measure a common-mode signal between the plurality of amplified signals, and
provide the common-mode signal to the non-inverting operational amplifier circuits;
wherein:
the non-inverting operational amplifier circuits are configured to use the common-mode signal to generate voltage-divided feedback signals used to generate the plurality of amplified signals;
an electrode included in the plurality of electrodes is configured to record a signal included in the plurality of signals;
a non-inverting operational amplifier circuit included in the plurality of non-inverting operational amplifier circuits comprises:
an operational amplifier comprising
a non-inverting input configured to receive the signal,
an inverting input configured to receive a voltage-divided feedback signal included in the plurality of voltage-divided feedback signals, and
an output configured to output an amplified signal included in the plurality of amplified signals and representative of an amplified version of the signal recorded by the electrode, and
a resistor network connected to the output and the inverting input, the resistor network configured to generate the voltage-divided feedback signal; and
the common-mode feedback circuit is configured to provide the common-mode signal to the non-inverting operational amplifier circuit by driving the resistor network with the common-mode signal.