Patent ID: 7701208

Claim:
A magnetic sensor circuit, comprising: a magnetoelectric converting element configured to generate an output voltage across a first terminal pair or a second terminal pair in accordance with applied magnetism; a switch selecting circuit having a first switch status in which a power supply voltage is applied to said first terminal pair and an output voltage generated at said second terminal pair is output across a first output end and a second output end, and a second switch status in which the power supply voltage is applied to said second terminal pair and an output voltage generated at said first terminal pair is output across said first output end and said second output end; an amplifying unit configured to output to a first amplification output end a first amplified voltage obtained by amplifying the voltage of said first output end input to a first amplification input end, and configured to output to a second amplification output end a second amplified voltage obtained by amplifying the voltage of said second output end input to a second amplification end; a comparing unit configured to compare a first comparison voltage input to a first comparison input end with a second comparison voltage input to a second comparison input end and configured to generate a comparison output when said first comparison voltage is different from said second comparison voltage; a first capacitor provided between said first amplification output end and said first comparison input end; a second capacitor provided between said second amplification output end and said second comparison input end; a first switch circuit for applying a first reference voltage to said first comparison input end; and a second switch circuit for applying a second reference voltage to said second comparison input end.