CPC H03F 1/02 (2013.01) [A61B 5/053 (2013.01); H03F 1/56 (2013.01)] | 20 Claims |
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.
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