Micro Fluxgate Magnetic Sensor Interface Circuits Using ΔΣ Modulation

摘要

This paper presents high-resolution micr fluxgate magnetic sensor interface circuits using 2nd -orderΔΣ modulation. The fluxgate sensing element is placed in modulation loop in order to reduce the instability due to the use of ferromagnetic core. As one of the integrators, a continuous-time integrator is used, and that is also used for the anti-aliasing filter for phase sensitive detector output.