A Signal and Offset T&H Frontend for Spinning Hall Sensors with Ping-Pong and Chopping Techniques

Abstract

A spun Hall sensor with continuous-time chopping and ping-pong sampling techniques for fast overcurrent detection application is presented in this paper. The proposed background track-and-hold ping-pong comparator continuously tracks the input Hall signal while cancels the Hall offset and the amplifier offset without shorting the input amplifier. In addition to the spinning-current technique, a system chopping and a chopped 6-bit DAC with temperature coefficient (TC) correction guarantee an overcurrent threshold drift of 1.06A (0.7% of the typical full-scale range 150A) from −50°C to 125°C.