US 12,436,207 B2
Sensor output compensation circuit
Aritsugu Yajima, Nagaokakyo (JP); and Tetsuya Narita, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Sep. 14, 2023, as Appl. No. 18/368,175.
Application 18/368,175 is a continuation of application No. PCT/JP2022/010726, filed on Mar. 10, 2022.
Claims priority of application No. 2021-061404 (JP), filed on Mar. 31, 2021; and application No. 2021-063118 (JP), filed on Apr. 1, 2021.
Prior Publication US 2024/0003992 A1, Jan. 4, 2024
Int. Cl. G01R 33/00 (2006.01); G01R 33/09 (2006.01)
CPC G01R 33/0082 (2013.01) [G01R 33/0029 (2013.01); G01R 33/098 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A sensor output compensation circuit comprising:
a differential amplifier circuit to amplify, as a sensor output, a differential voltage between detection voltages measured in two detection signal output terminals of a sensor including a sensor element that has a resistance value that changes depending on a detected physical quantity and that is connected by bridge connection;
a temperature sensor circuit to detect an ambient temperature;
a temperature coefficient sensitivity compensation circuit to apply, to two power terminals of the sensor, a bias voltage to cancel a variation in a sensitivity of the sensor output as the ambient temperature changes, based on the ambient temperature that is detected by the temperature sensor circuit; and
a linearity compensation circuit connected at an output of the differential amplifier circuit to adjust linearity of the sensor output.