摘要
現今，許多電子產品需要利用電池作為供應電源，但是電池並不能穩定且持續的保持固定的電壓。為了提供系統穩定的電壓，電荷幫浦與電壓的調節是相當的重要。藉由帶差參考電壓(bandgap reference)，調節出穩定的電壓並不困難。但是在產品的製造上，帶差參考電壓卻會增加生產上的複雜度。為了克服這個問題，本論文討論如何不使用帶差參考電壓而能調節輸出電壓的電荷幫浦。 本設計的電荷幫浦使用交互連結式(cross-coupled type)的電路架構。並且利用一個弛張式震盪器來提供電荷幫浦驅動的時脈。為了使用脈衝跨越(pulse-skip mode)的模式來調節輸出電壓，我門利用修正弛張式震盪器內部的操作電流來控制時脈。電晶體的臨界電壓(threshold voltage)被用來取代參考電壓值，並且利用一個P型電晶體去偵測輸出電壓的量值，若電壓值高過設定的電壓，則P型電晶體將導通，並且提供訊號將弛張式震盪器關閉，此時，電荷幫浦將停止升壓。 因為系統的供應電源為電池，所以電壓值會逐漸的降低，因此系統必須保持供應電壓在一定的範圍內，皆可以正常操作。這樣將是本電路設計中一個重要的課題。 本論文使用HSPICE對電路系統做模擬與測試，經由模擬可以得到不錯的結論，調壓式電荷幫浦將可以提供一個與供應電源、負載電流微弱相關的穩定輸出電壓值。
並列摘要
Nowadays, many electronic products are battery powered devices. However, most batteries are unable to maintain a steady voltage. In order to provide a steady voltage source, the charge pump and regulator are significant. With bandgap reference, to regulate the output voltage is easy. Nevertheless, the bandgap reference increases the manufacture complexity. In order to solve this problem, the charge pump regulated without bandgap reference is proposed in the thesis. The charge pump structure is cross-coupled type, and the clock is provided with a relaxation oscillator. In order to regulate the charge pump by pulse-skip mode, the current operated in the relaxation oscillator should be adjusted. The bandgap reference voltage was replaced by threshold voltage, and the output voltage is sensed with a PMOS transistor. If the output exceeds the default voltage, the PMOS transistor turns on, and the relaxation oscillator turns off. Meanwhile, the charge pump stops boosting. The circuit needs to be normally operated in a wide voltage range due to the gradually decreased voltage supply from the battery. To overcome this problem is also an important issue in this thesis. The circuit system is checked and verified with the simulation software “HSPICE”, and the result shows that the output voltage provided from the charge pump is weakly dependent on power supply and load current.