Patent ID: 8633687

Claim:
A Hall element sensor circuit comprising: a Hall element; a Hall element source; a switch matrix operatively connected to the Hall element and the Hall element source to establish a spinning current in the Hall element and to receive a Hall element signal from the Hall element based upon the spinning current; a front end amplifier including a first input operatively connected to a first switch matrix output and a second input operatively connected to a second switch matrix output; at least one voltage source operatively connected to the front end amplifier at a location in the Hall element sensor circuit between the switch matrix and the front end amplifier; and a clock signal generator operatively coupled to the switch matrix and configured to control the switch matrix to establish the spinning current, wherein: the sensor circuit further comprises a switch having a first position whereat the first input of the amplifier is electrically connected to the second input of the amplifier by the switch, and a second position whereat the first input of the amplifier is not electrically connected to the second input of the amplifier by the switch; and the clock signal generator is operably connected to the switch to control the switch between the first and second positions.