Patent ID: 7847536
Filing Date: 2010-12-07
Classification: G01D,G01R,H01L

Abstract:
1. A Hall sensor with thermal drift control, comprising: a planar semiconductive material having, respectively, a central magnetic field responsive active area portion and outer perimeter portions; a plurality of electrical contacts coupled to said outer perimeter portions; a gate electrode coupled to and covering said central magnetic field responsive active area portion; and a gate control voltage supply external to said planar semiconductive material, said gate control voltage supply comprising an amplifier having inputs coupled to a pair of said plurality of electrical contacts and having an output responsive to a common mode voltage between said amplifier inputs; a voltage divider having a pair of inputs and an output, one of said pair of voltage divider inputs being coupled to said output of said amplifier, and said output of said voltage divider being coupled to said gate electrode.