本論文呈現一種快速暫態響應之磁滯降壓式轉換器，加入具有動態磁滯帶的適應性漣波合成技術可達到較佳的暫態響應速度和轉換效率。適應性合成漣波技術提供一個可依負載條件做調整的鋸齒波訊號，磁滯帶(hysteresis band)寬度亦可依不同負載進行變換。本論文之降壓轉換器進一步的加入不連續導通模式運作，如此可提高輕載時的轉換效率。全電路使用TSMC 0.35μm 2P4M CMOS製程技術實現，全電路模擬結果顯示當負載由80mA 至600mA回復時間低於13微秒內，且在輸入電壓範圍2.7V~4.5V，轉換效率可達90%。

A fast response hysteresis buck converter is presented in this thesis. The adaptive synthetic ripple modulation (SRM) technique is combined with dynamic hysteresis band to achieve better transient response as well as conversion efficiency. The adaptive SRM provides a saw tooth waveform with the slope adjusted according to load conditions. The hysteresis band and thus the switching frequency are also adjusted automatically according to load conditions. The buck converter is further put into the discontinuous-conduction mode (DCM) for better conversion efficiency at light load conditions. The circuits are implemented using a standard TSMC 2P4M 0.35μm CMOS process. The design has the output recovery time less than 13μs for load transient between 80mA and 600mA. The efficiency is 90% for operation voltage range from 2.7V to 4.5V under both light and heavy load conditions.

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