Sensor device
a sensor device and sensor technology, applied in the field of sensor devices, can solve the problems of offset voltage and low-frequency l/f noise in the output of the amplifier, and achieve the effects of accurate measurement of the temperature of an object, increased circuit size of the sensor device, and increased circuit size of the low-pass filter
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[0026]A sensor device according to one embodiment of the present invention is described below. FIG. 1 is a diagram showing an exemplary construction of the sensor device. FIG. 2 is a diagram showing an exemplary construction of a chopper amplifier unit. FIG. 3 shows graphs showing an exemplary operation of the chopper amplifier unit. FIG. 4 is a diagram showing an exemplary construction of an integrator.
[0027]The sensor device 1 shown in FIG. 1 includes a controller (control unit) 11. The controller 11 centrally controls respective constituent elements described below. The sensor device 1 further includes a voltage detection type sensor unit 20, a chopper amplifier unit 10 and an AD conversion circuit (digital conversion unit) 12. The sensor unit 20 converts a physical quantity into a voltage value and outputs a voltage signal indicating this voltage value.
[0028]The chopper amplifier unit 10 includes a first chopper circuit 100, an operational amplifier 101 and a second chopper circuit
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