| Summary: | 碩士 === 國立交通大學 === 電機工程學系 === 105 === This thesis presents a 0.5V low voltage analog front-end circuit, mainly used in EEG, ECG and EMG measurements. The front-end amplifier rejects noise by chopper stabilization amplifier and AC feedback technology. Simultaneously, the front-end amplifier has an adjustable bandwidth function, which is able to avoid unnecessary power waste by adjusting the system bandwidth when measuring the different frequency signals. Finally, a SAR ADC converts biomedical signal into digital signal. The total power dissipation of the system at high bandwidth mode is 44.84μW, as well as low bandwidth mode is 3.84μW. The chip is realized in UMC 1P6M 0.18µm CMOS process. The active die area is 1.165*1.565mm^2.
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