A Current-Mode CMOS Hall Sensor Microsystem based on Four-Phase Current Spinning Technique

摘要

A novel Hall sensor microsystem working in the current mode is presented. The current-mode four-phase current spinning technique is applied to modulate the polarity of the Hall current and the offset current. Further, the use of a current integrating amplifier and a correlated double sampling demodulator performs twice offset-cancellation operations and then demodulates the Hall signal to the low frequency. Designed by 0.18-μm CMOS technology, the simulation results show that the Hall sensor obtains a low residual offset less than 88 μT and high linearity up to 99.9% in the magnetic fields ranging from 5 to 155 mT.