A novel Hall dynamic offset cancellation circuit based on four-phase spinning current technique

A novel Hall dynamic offset cancellation circuit based on four-phase spinning current technique is introduced. The offset cancellation circuit of Hall sensor applies a novel configuration including four-phase spinning current modulator, instrumentation amplifier, correlated double sampling demodulator and adder, which effectively eliminate the offset and 1/f noise, and linearly amplify the Hall signal. Designed in 0.8 μm high voltage CMOS technology, the circuit simulation results show the residual offset is lower than 0.2 mT and the linearity is up to 99.9%.