In this dissertation, I designed the 2nd-order delta-sigma modulator for the A/D converter used in the s-EMG signal-processing LSI, and evaluate the characteristics of it. Through this evaluation, I found that amplifiers used in the integrators deteriorate the floor noise. As the result, the resolution of the delta-sigma modulator deteriorates. In order to improve the amplifier, three kinds of amplifiers with a di??erent circuit compositions are designed. All of the circuits were evaluated through HSPICE simulation with ROHM 0.18 ??m CMOS device parameters. From the simulation results, I found that SQNR was improved about 20dB. Finally, SQNR of the ΔΣ modulator using class AB amplifiers was about 90dB and the value resulted in ENOB of 14bit.
雑誌名
Memoirs of the Faculty of Engineering, Miyazaki University
リポジトリのご案内
表面筋電位信号処理LSIのためのデルタ・シグマ変調機の設計
KJ00005015947.pdf
(665.23KB)
