Patent ID: 9134349
Filing Date: 2015-09-15
Classification: G01R,H03F

Abstract:
1. A chopper amplifier circuit for sensing Hall voltage, the amplifier circuit comprising: a Hall sampling circuit, including a first switching circuit for selectively coupling each of four nodes of a Hall plate to either a power source or a ground terminal; a differential amplifier; a second switching circuit configured for selectively coupling each of the four nodes of the plate to inputs of the differential amplifier; a Hall voltage signal retaining circuit, including a first group of four storage devices and a second group of four storage devices; a third switching circuit configured for storing a first output of the differential amplifier to one of the first group of four storage devices and for storing a second output of the differential amplifier to one of the second group of four storage devices; and a fourth switching circuit configured for selectively coupling the first group of four storage devices to a first output of the chopper amplifier circuit and for coupling the second group of four storage devices to a second output of the chopper amplifier circuit.