US 12,192,712 B2
Readout circuit for microphone sensor
Joon Jea Sung, Seoul (KR); and Young Che Park, Gyeonggi-do (KR)
Assigned to FYD CO., LTD., Gyeonggi-Do (KR)
Filed by FYD CO., LTD., Gyeonggi-do (KR)
Filed on Dec. 23, 2022, as Appl. No. 18/087,967.
Claims priority of application No. 10-2022-0019730 (KR), filed on Feb. 15, 2022.
Prior Publication US 2023/0262382 A1, Aug. 17, 2023
Int. Cl. H04R 3/00 (2006.01); H03K 17/687 (2006.01)
CPC H04R 3/00 (2013.01) [H03K 17/6872 (2013.01); H04R 2410/03 (2013.01)] 4 Claims
OG exemplary drawing
 
1. 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.