Detection circuit for connection impedance and electronic device

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.