US 12,320,714 B2
CMOS temperature sensor and operating method thereof
Seong Jin Kim, Ulsan (KR); and Chang Yong Shin, Ulsan (KR)
Assigned to SOLIDVUE, INC., Suwon-si (KR)
Filed by SOLIDVUE, INC., Suwon-si (KR)
Filed on Nov. 16, 2021, as Appl. No. 17/528,127.
Claims priority of application No. 10-2020-0156537 (KR), filed on Nov. 20, 2020.
Prior Publication US 2022/0163402 A1, May 26, 2022
Int. Cl. G01K 7/01 (2006.01); G01K 7/34 (2006.01)
CPC G01K 7/01 (2013.01) [G01K 7/34 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A CMOS temperature sensor for measuring a temperature comprising:
a readout circuit that outputs a readout value by comparing a voltage value at a first end of a side of a capacitor charging a charge based on a proportional current proportional to a temperature with an inverse proportional voltage inversely proportional to the temperature or comparing a voltage value at a second end of the capacitor formed at another side of the capacitor from the first end with a ground voltage;
a control unit that determines a temperature based on an oscillation period of the readout value output from the readout circuit; and
a bias circuit that supplies the proportional current generated by applying a differential voltage between base emitter voltage values of bipolar junction transistors inversely proportional to the temperature in the bias circuit.