Patent ID: 8525591

Claim:
A physical quantity detection device comprising: a signal level conversion circuit comprising: a first differential amplifier circuit that multiplies a potential difference between a first input signal and a second input signal by G 1 thereby providing an output signal; and a second differential amplifier circuit that multiplies a potential difference between the output signal of the first differential amplifier circuit and the second input signal by G 2 thereby providing an output signal, where G 1 ×G 2 <0 and 0<−(G 1 +1)×G 2 <2; a sensor element that detects a physical quantity; and a physical quantity signal generation section that generates a physical quantity signal having a signal level according to the physical quantity based on a signal generated by the sensor element, the physical quantity signal and a reference voltage signal being supplied to the signal level conversion circuit as the first input signal and the second input signal, respectively.