| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 88 === In this thesis, two kinds of magnetic sensors, the Hall Sensor and the MAGFET, are designed. By the experimental results, it is convinced that these magnetic sensors can measure the magnetic field precisely. Using MAGFET devices, several magnetic field readout circuits are designed, including the magnetically controlled current multiplier, the magneto-operational amplifier, the magnetically controlled oscillator, and the magnetic-to-pulse signal generator. These application circuits are implemented in UMC 0.5m DPDM CMOS process and SHARP 0.35m DPDM CMOS process. The measurement results verify the correctness and feasibility of designed circuits. Finally, a magnetic-to-digital converter, which is composed of a magneto-operational amplifier and a sigma-delta analog-to-digital converter, is proposed. This magnetic-to-digital converter is implemented in UMC 0.5m DPDM CMOS process. The measurement is performed under a 5V supply voltage and a sampling rate of 2.5MHz. From the measurement results, this magnetic-to-digital converter can measure the magnetic field within 100mT, and its resolution is 1mT.
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