本論文分為兩部分，第一部分針對現存的電流模式控制之切換式降壓轉換器，建立一個系統性的設計與分析流程，包含系統模型、補償器設計、電晶體層次設計、晶片下線，最後藉由晶片量測結果來驗證此設計流程的正確性。量測結果證明在輸入電壓於2.7~4.2V的範圍內，在200mA~500mA負載電流範圍內，此轉換器可以穩定的提供1.8V的輸出電壓，暫態響應約為80μs，最高轉換效率為92.3%。而藉由頻域的量測，也證明了本設計與分析流程的正確性，同時證明系統的穩定性。本電流模式控制降壓轉換器使用TSMC 0.35μm CMOS製程進行設計，外接電感與輸出電容分別為4.7μH與8.9μF。
　　本論文第二部分提出一具有快速暫態響應、寬負載電流範圍、近似V2適應性導通時間控制切換式降壓穩壓器，此穩壓器使用固定時間控制為基礎，搭配適應性導通時間來改善非線性控制不定頻的缺點，使其在輕重載時系統可以近似定頻操作，在極輕載時為維持轉換效率，進入PFM模式操作。本論文使用前授路徑的方式，可以不需要依靠輸出電容ESR即可取得與電感電流同相之訊號，可使用小ESR的電容降低輸出漣波。本轉換器使用TSMC 0.35um CMOS製程進行設計與製作，外接電感與輸出電容分別為4.7μH與8.9μF，量測結果顯示在輸入電壓3.3V~4.2V、負載電流為5mA~800mA的範圍內，可以提供穩定之輸出電壓1.2V，暫態響應小於4μs，最高轉換效率為86.6%。

This thesis is composed of two parts. The first part focuses on the current mode control switching regulator. Systematic design procedure and analysis flow are presented with system modeling,compensator design,transistor level design and chip implementation. The design procedure is verified by the chip’s measurement results. The measurement results show that this converter can operate with load current from 200mA-500mA in a supply voltage from 2.7-4.2V and the output voltage of 1.8V. The transient response time is about 80μs and the highest efficiency is 92.3%. By the loop gain measurement, the correctness of the analysis flow is verified. The stability of the proposed buck converter was guaranteed by the loop gain measurement, too. This converter has been designed and fabricated with TSMC 2P4M 0.35μm CMOS process. The off chip inductor and the output capacitor are 4.7μH and 8.9μF.
In the second part of this thesis, a fast transient response、wide load current range quasi-V2 adaptive on time switching regulator is presented. This converter used the constant on time control as the operation principle. With the adaptive on time technique, the switching frequency variation problem has been fixed. The system switching frequency is pseudo fixed between the light load and heavy load condition. In the ultra-light load condition, this converter would operate in PFM mode in order to increase the efficiency. By the feed-forward technique, the inductor current information is obtained no longer relying on the ESR of output capacitor, which could reduce the output ripple by using capacitor with small ESR. This converter has been designed and fabricated with TSMC 2P4M 0.35μm CMOS process. The off chip inductor and the output capacitor are 4.7uH and 8.9uF. The measurement result show that this converter can operate with load current from 5mA-800mA in a supply voltage from 3.3-4.2V and the output voltage of 1.2V. The transient response time is about 4us and the highest efficiency is 86.6%.

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