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Noise reduction method for PHMR bridge sensor by resistance compensator
byeonghwa Lim,Jaehoon Lee,Changyeop Jeon,Cheol Gi Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
MR sensors are of great interest in industrial and medical applications due to their high sensitivity, portable size, and low cost. However, the noise of the MR sensor limits the sensitivity and requires complex signal processing, which limits the utilization of the sensor. To utilize the MR sensor effectively, it is necessary to increase the sensitivity of the sensor and reduce the noise. For this purpose, a self-balancing bridge type sensor with integrated resistance compensator for noise reduction in the frequency range from 0.5 Hz to 200 Hz has been devised. The proposed resistance compensator integrated with the self-bridge sensor architecture adjusted the offset voltage compensation at the Wafer level and significantly improved the sensor noise level. As a result, we achieved the lowest noise of 3.34nV/√Hz at about 100Hz. It was also confirmed that thermal drift was significantly reduced through offset voltage compensation. Therefore, the developed sensor can be used in various industrial and medical applications.