OFFSET CANCEL CIRCUIT, CAPABLE OF CORRECTLY CANCELLING AN OFFSET VALUE OF AN OUTPUT VOLTAGE OF A HALL DEVICE

摘要

PURPOSE: An offset cancel circuit is provided to receive voltages in four directions, thereby leveling output voltages of a hall device in the first to fourth states.;CONSTITUTION: A switching element is connected to a hall device(10). An amplification circuit(12) comprises operational amplifiers(12a,12b). A leveling circuit(14) comprises switching devices, condensers(C1~C4), and an operational amplifier. The switching devices are connected to one of output terminals of the operational amplifiers, terminals of the condensers, and an input terminal of the operational amplifier. An offset cancel circuit(100) cancels an offset value of an output voltage of the hall device by conversion of an output state and the first to fourth states.;COPYRIGHT KIPO 2011