高灵敏度磁传感器信号处理电路的设计

摘要

The offset voltage sensor and external interference signal can cause the magnetic signal of"saturation",so the weak magnetic field signal can be"annihilation". Using high-sensitivity magnetic sensor based on tunneling magneto-resistance technology TMR2303 sig-nal processing circuit design to solve the signal which is amplified due to magnetic field sig-nal"saturation". Experiments in complex environments to test the circuit can be used to de-tect weak magnetic signals and has the advantages of low power consumption,small size, strong anti-jamming ability and low cost.%由于传感器自身的失调电压以及外界干扰信号会造成磁场信号"饱和"现象,使正常的弱磁场信号被"湮没".本文采用基于隧道磁电阻技术的高灵敏度磁传感器TMR2303进行信号处理电路的设计来解决磁场信号经过放大后引起的"饱和"问题.经实验测试,在复杂环境下该电路能够较好的检测出微弱磁场信号,且具有低功耗、体积小、抗干扰能力强以及低成本等优点.