Circuit for reducing residual offset of integrated hall sensor

The invention discloses a circuit for reducing the residual offset of an integrated hall sensor. The circuit employs rotating current modulation and high-pass filtering, and enables offset and low-frequency 1/f noise, which are generated by a hall device, to be eliminated in advance, and then further eliminates hall offset through a subsequent demodulation circuit. Therefore, the circuit is stronger in capability of eliminating the hall device offset. A signal demodulated by the hall sensor is enabled to be modulated into a high-frequency signal through a feedback modulator, and the high-frequency signal serves as a feedback signal and is transmitted to a difference-difference amplifier for amplification along with a hall signal outputted by a rotating current modulator, thereby forming a closed-loop signal conditioning circuit, and further reducing the residual offset caused by the signal conditioning circuit. The circuit is simple in structure, is easy to achieve circuit integration, cannot increase the manufacture cost, and can obtain low residual offset.