0.5-V低電壓可調頻寬類比前端電路應用於生醫訊號紀錄

Abstract

本論文提出一0.5V低電壓類比前端電路，主要應用於ECG、EEG與EMG的測量。前端放大器使用截波穩定放大器與交流回授的技術來抑制雜訊。同時前端放大器具有可調頻寬的功能，對於測量不同頻率的訊號時可以調整系統頻寬來避免不必要的功率浪費。最後由連續近似式類比數位轉換器將生醫訊號轉成數位訊號。整體系統總功耗在高頻寬模式下為44.84µW，低頻寬模式下為3.84µW。所提出的架構將被實現在UMC CMOS 0.18 µm的製程，其晶片面積為1.165*1.565mm^2。

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.