US 11,870,395 B2
Detection circuit for connection impedance and electronic device
Lei Huang, Beijing (CN)
Assigned to SHANGHAI YAOHUO MICROELECTRONICS Co., Ltd., Shanghai (CN)
Filed by SHANGHAI YAOHUO MICROELECTRONICS Co., Ltd., Shanghai (CN)
Filed on Jul. 18, 2021, as Appl. No. 17/378,735.
Claims priority of application No. 202110163023.4 (CN), filed on Feb. 5, 2021.
Prior Publication US 2022/0255505 A1, Aug. 11, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 3/45 (2006.01); H03F 1/56 (2006.01); A61B 5/053 (2021.01)
CPC H03F 1/02 (2013.01) [A61B 5/053 (2013.01); H03F 1/56 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A detection circuit for a connection impedance, comprising: a detection operational amplifier module, wherein the detection operational amplifier module comprises: a first buffer, a switch unit, and a main operational amplifier;
a first input terminal of the first buffer is connected to a first acquisition electrode through a first front-end circuit, an output terminal of the main operational amplifier is connected to a back-end circuit, and an output terminal of the first buffer is connected to a second input terminal of the first buffer;
a first terminal of the switch unit is directly or indirectly connected to the first front-end circuit, and a second terminal of the switch unit is connected to the back-end circuit; and
the switch unit is configured to: control the first front-end circuit to be directly connected to the back-end circuit, to form a turned-on straight-through channel, or control the straight-through channel to be turned off, wherein the main operational amplifier stops operating when the turned-on straight-through channel is formed.