This paper presents the design optimization of a micromachined ring-type fluxgate sensor with localized saturation core to obtain low power consumption. The design optimization has been performed for finding a model with lowest excitation current, so the function of fluxgate can be achieved with low power consumption. The optimized model exhibits an excitation current of 100 mA, sensitivity of 540 V/T at 60 μT, and span of ～300 μT, with a power consumption of 25 mW.
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