Readout circuit for microphone sensor

A readout circuit for a microphone sensor, the readout circuit comprising:

• an input terminal to which a sensing signal is configured to be inputted from the microphone sensor;
• and
• an output terminal to which the sensing signal is configured to be outputted;
• a first transistor having a first gate end connected to the input terminal, a first source end connected to the output terminal and a power terminal, and a first drain end connected to ground;
• a second transistor having a second drain end connected to the output terminal and the first source terminal, a second source end connected to the power terminal, and a second gate end connected to a reference terminal;
• a third transistor having a third drain end connected to the first source terminal, the second drain end, and the output terminal, a third gate terminal connected to the reference terminal, and a third source end connected to the ground;
• a fourth transistor having a fourth drain end connected to the reference terminal and the power terminal, a fourth gate end connected to the output terminal and the third drain end, and a fourth source end connected to the first drain terminal;
• and
• a diode unit connected to the fourth drain end, the fourth source end, and the first drain end.