論文第一部分使用了一個二階三角積分調變器來取代原本的脈波寬度調變技術。利用三角積分調變器的超取樣與雜訊移頻特性來減少降壓轉換器輸出端的電磁干擾,適合應用於後端為射頻、通訊系統或是音頻電路。電路使用台灣積體電路公司 0.35-μm 互補式金屬氧化物半導體製程來實現,晶片面積為1.24 x 1.36 mm2(包含封裝晶片接腳),操作電壓為3.6V~5V而輸出電壓為1V~3V,最大工作電流為500mA。 論文第二部分提出了使用三角積分調變器之具有十微秒暫態響應與低電磁干擾降壓轉換器。此電路在輸出端與三角積分調變器中加入了快速迴路,並且增加模式選擇功能,在負載電流產生變化時能夠控制切換模式,達到快速暫態響應與降低過衝電壓的效果。電路使用台灣積體電路公司 0.35-μm 互補式金屬氧化物半導體製程來實現,晶片面積為1.48 x 1.48 mm2(包含封裝晶片接腳),操作電壓為3.6V~5V而輸出電壓為1V~3V,最大工作電流為500mA。
The first part of this thesis is a 2nd-order delta-sigma modulator for DC-DC buck converter and the control circuit uses delta-sigma modulator instead of a pulse width modulation control. Delta-sigma modulator with oversampling and noise shaping mechanism can effectively reduce the converter’s output noise; therefore, this buck converter is suitable for RF, communication system or audio circuit.The orioised buck converter has been fabricated with a TSMC 0.35-μm CMOS 2P4M process, the total chip area is about 1.24 x 1.36 mm2(include PADs), the operating voltage is 3.6V~5V, the output voltage is 1V to 3V, and the maximum current is 500mA. The next part of this thesis introduces a 10-μs transient-response and low EMI DC-DC buck converter with 2nd-order delta-sigma modulator. In order to achieve fast-transient-response and reduce overshoot, undershoot voltage, the proposed buck converter is added fast transient path between the output of the converter and delta-sigma modulator, in addition, the duty selector can control the duty cycle of the buck converter to limit overshoot or undershoot voltage. This converter fabricated on TSMC 0.35-μm DPQM CMOS process, the chip area is 1.48 x 1.48 mm2 , input voltage range of the proposed converter is from 3.6V to 5V, the output voltage can be regulated from 1V to 3V and the maximum output current is 500mA.