Sensor device
AssigneeMurata Manufacturing Co., Ltd.
InventorYasuhide TAKASE
Life of this patent
Estimating the term…
Abstract
In a sensor device, a bias circuit includes a bias voltage generation circuit, a regulator circuit, an impedance calculation circuit, and a bias voltage correction circuit. The bias voltage generation circuit generates a bias voltage required to operate the bridge circuit. The regulator circuit applies the bias voltage to the bridge circuit and monitors a bias current supplied to the bridge circuit. The impedance calculation circuit receives a value of the bias voltage and a value of the bias current and calculates an impedance of the bridge circuit. Based on the impedance, the bias voltage correction circuit causes the bias voltage to be corrected to a voltage that compensates for a change in characteristics of the bridge circuit.
Claims15
A sensor device comprising:
- a bridge circuit including at least one sensor, characteristics of which change in accordance with a detected physical quantity;
- a detection signal reception circuit to receive a sensor detection signal that is output from a detection signal output end of the bridge circuit in accordance with a change in characteristics of the sensor;
- a bias voltage generation circuit to generate a bias voltage required for an operation of the bridge circuit;
- a regulator circuit to apply a bias voltage generated by the bias voltage generation circuit to a bias end of the bridge circuit and monitor a bias current supplied to the bridge circuit;
- an impedance calculation circuit to receive a value of a bias voltage generated by the bias voltage generation circuit and a value of a bias current monitored by the regulator circuit and calculate an impedance of the bridge circuit;
- and
- a bias voltage correction circuit to cause, based on an impedance of the bridge circuit calculated by the impedance calculation circuit, a bias voltage generated by the bias voltage generation circuit to be corrected to a voltage that compensates for a change in characteristics of the bridge circuit.
Dependencies are inferred from the claim text.