phase contrast the connection between the current paths mr1 mr2 and the current paths mr3 mr4 is externally drawn and is connected to the power supply terminal vcc in addition the magnetic resistance strip 1a which is one end of the magnetic resistance element 1 is connected to the output terminal fg 1 the magnetic resistance strip 1b which is the other end of the magnetic resistance element 1 is connected to the output terminal fg 2 the magnetic resistance strip 2a which is one end of the magnetic resistance element 2 is connected to the output terminal fg 4 the magnetic resistance strip 2b which is the other end of the magnetic resistance element 2 is connected to the output terminal fg 3 moreover the output terminals fg 1 and fg 2 of the magnetic resistance element 1 are respectively connected to a separate power sources which are not illustrated the output terminals fg 1 and fg2 are connected to a differential input terminal of the differential amplifier circuit by which the differential output of the mid potential can be obtained furthermore the output terminals fg3 and fg4 of the magnetic resistance element 2 are also connected to separate power sources which are not illustrated the output terminals fg3 and fg4 are respectively connected to the differential input terminal which is not illustrated with which the differential output of.