Patent ID: 7377166

Claim:
A sensor signal processing system comprising a sensor and a detector for processing an output signal from the sensor so as to output a detection signal that corresponds to a physical phenomenon, wherein: a whole or part of the detector is made up of a semiconductor integrated circuit, the semiconductor integrated circuit includes an operational amplifier made up of a semiconductor integrated circuit element, an input terminal of the operational amplifier is connected to an internal input resistor that is inside the semiconductor integrated circuit, formed in a manufacturing process of the semiconductor integrated circuit, and made up of the semiconductor integrated circuit element having temperature characteristics unique to the semiconductor integrated circuit; the semiconductor integrated circuit is provided with at least two connection terminals for connecting both ends of an external input resistor that is made of a discrete component and has temperature characteristics of substantially zero with respect to the temperature characteristics of the internal input resistor, both ends of the internal input resistor being connected to the two connection terminals, the both ends of the external input resistor being connected to the two connection terminals; and sensitivity-temperature characteristics of the sensor are compensated by temperature characteristics that are a combination of temperature characteristics of the internal input resistor and temperature characteristics of the external input resistor.