Sensor output compensation circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorAritsugu YAJIMA
Life of this patent
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Abstract
A sensor output compensation circuit includes a linearity compensation circuit to adjust linearity of a sensor output by changing a resistance value of a first variable resistor, a compensation circuit to adjust sensitivity temperature characteristics of a sensor output by changing a resistance value of a second variable resistor, and a compensation circuit to adjust temperature characteristics of an offset voltage of the sensor output by inputting a reference voltage to a reference voltage terminal of an operational amplifier of an amplifier circuit for compensation.
Claims12
A sensor output compensation circuit comprising:
- a differential amplifier circuit to amplify, as a sensor output, a differential voltage between detection voltages appearing in a pair of detection signal output terminals of a sensor in which sensor components whose resistance values change in accordance with a detected physical quantity are bridge-connected;
- an amplifier circuit to adjust an output of the differential amplifier circuit;
- and
- a linearity compensation circuit for the sensor output to change an amplification rate of the amplifier circuit to an amplification rate that cancels distortion appearing with non-linearity in the sensor output in response to a change of a physical amount.
A sensor output compensation circuit comprising:
- a differential amplifier circuit to amplify, as a sensor output, a differential voltage between detection voltages appearing in a pair of detection signal output terminals of a sensor in which sensor components whose resistance values change in accordance with a detected physical quantity are bridge-connected;
- an amplifier circuit to adjust an output of the differential amplifier circuit;
- a temperature sensor circuit to detect an ambient temperature;
- and
- a sensor sensitivity temperature characteristic compensation circuit to change an amplification rate of the amplifier circuit to an amplification rate that cancels fluctuation appearing in sensitivity of the sensor output in response to a change of the ambient temperature detected by the temperature sensor circuit based on the ambient temperature.
A sensor output compensation circuit comprising:
- a differential amplifier circuit to amplify, as a sensor output, a differential voltage between detection voltages appearing in a pair of detection signal output terminals of a sensor in which sensor components whose resistance values change in accordance with a detected physical quantity are bridge-connected;
- an amplifier circuit to adjust an output of the differential amplifier circuit;
- a temperature sensor circuit to detect an ambient temperature;
- and
- an offset temperature characteristic compensation circuit to cause a reference voltage that cancels fluctuation of an offset voltage of the sensor output appearing in response to a change of the ambient temperature to be input to a reference voltage terminal of the amplifier circuit for compensation by referring to the ambient temperature detected by the temperature sensor circuit.
Dependencies are inferred from the claim text.