The Design and Realization of Magnetic Sensor and Its Readout Circuit

• Main Authors: Li-An Ho, 何立安
• Other Authors: Shen-Iuan Liu
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/42270293585682510624

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 0.5m DPDM CMOS process and SHARP 0.35m 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 0.5m 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.