臺灣博碩士論文加值系統

隨著可攜式電子產品的發展，開發體積小且低功耗以延長電池壽命的產品已經成為現今研究的主題。對於可攜式電子產品的應用來說，低壓降線性穩壓器是一個合適的選擇，它擁有低壓降和低靜態電流的特性，因此有效增加電池壽命，另外還有出色的線性調節度與負載調節度、較佳的暫態響應及結構簡單等優點。傳統的低壓降線性穩壓器都需要外掛一顆很大的輸出負載電容(uF級)，才能使整體電路穩定，並擁有好的暫態響應。但對可攜式的產品來說，此外掛的電容會占據相當大的面積。因此，本研究去除了這顆較大的輸出電容，改以另外的補償電路作頻率補償，並加入輸出電壓感測電路來改善暫態響應。

本論文一開始先介紹傳統型低壓降線性穩壓器的結構，再來會介紹基本名詞定義和設計上的考量，接著提出一個無輸出電容式低壓降線性穩壓器的架構。此架構先設計如何產生一個因移除輸出電容所移除的低頻主極點，並透過誤差放大器裡的第二級High -Swing放大器的修改以及輸出電壓感測電路的幫助，使此電路可以有快速的暫態響應特性。

With the development of portable battery-operated electronic devices, developing small size and low power consumption to extend battery life products have become the subject of the study. Because of low dropout voltage and quiescent current, excellent line regulation and load regulation, good transient response and simple structure, the low dropout (LDO) linear regulator is widely used in portable systems. The traditional linear regulator has to consider the external output capacitance for good stability and transient response, so it occupies a large area of the LDO regulator. Therefore, the capacitor-free low dropout voltage linear regulator, with frequency compensation circuit and output voltage sensing circuit to improve the stability and transient response of this regulator is proposed in this study.

First, this study will introduce the traditional architecture of low-dropout linear regulator. Then, the definition of basic terms and the design considerations will be introduced. Because of removing external output capacitor, we will design other circuit to create new low-frequency dominant pole for the stability of the circuit. Then, we will improve transient response by modifying the high-swing amplifier of the error amplifier and adding output voltage sensing circuit.