US 12,436,206 B2
Sensor output compensation circuit
Aritsugu Yajima, 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. 18/368,173.
Application 18/368,173 is a continuation of application No. PCT/JP2022/011139, filed on Mar. 11, 2022.
Claims priority of application No. 2021-061404 (JP), filed on Mar. 31, 2021; and application No. 2021-065128 (JP), filed on Apr. 7, 2021.
Prior Publication US 2024/0003991 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 a sensor output outputted based on a predetermined detection voltage measured in detection signal output terminals of two sensors including respective sensor elements with a resistance value that changes depending on a detected physical quantity and that are connected by a bridge connection, the two sensors being located at relative positions between which an influence of a residual magnetic field is canceled out, the sensor output depending on the physical quantity detected by the sensors; and
a bias circuit to apply a voltage to two power terminals of one of the two sensors in a direction opposite to a direction in which a voltage is applied to two power terminals of another of the two sensors; wherein
the differential amplifier circuit includes an instrumentation amplifier and a compensation amplifier circuit to adjust an output of the differential amplifier circuit.