| 摘要 |
PROBLEM TO BE SOLVED: To provide a common bias circuit which reduces offset fluctuations in bias voltage in the midpoint of a magnetoresistive element by an input leakage current of a differential current amplification circuit. SOLUTION: A midpoint potential VM of the magnetoresistive element (RMR) is set to be zero by allowing an input leakage current of the differential current amplification circuit (IB1), an input leakage current of a pseudo-differential amplification circuit (IB2), a first resistance (R1), a second resistance (R2), a third resistance (R3), and a fourth resistance (R4) to have the following relationships: R1=R2, R3=R4, and R3×IB1=2×R1×IB2. COPYRIGHT: (C)2005,JPO&NCIPI
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