本研究透過不同負載阻抗的X參數模型用來預測GaAs pHEMT的等功率圓，用以獲得最大輸出功率。這新方法是萃取不同負載阻抗X參數去預測獲得史密斯圖中的等功率圓，這會比傳統負載拉移方式更為方便快速。由預測所獲得之最佳輸出功率特性會與實際負載拉移獲得的功率結果一致。可靠且一致的結果有助於RF領域的功率放大器設計。

The prediction of maximum output power for GaAs pHEMT is implemented by power contour determined from X-parameter model at different impedance. This novel method to extract load independent X-parameters for power contour prediction on Smith Chart is more convenient than the conventional load-pull method. The optimum output power characteristics are in good agreement between the prediction and the load-pull experimental results. This investigation of the reliable approach is good for RF power amplifier designing.

目錄
頁次
論文審定書----------------------------------------------------------------------------------------i
誌謝-------------------------------------------------------------------------------------------------ii
中文摘要-------------------------------------------------------------------------------------------iii
Abstract--------------------------------------------------------------------------------------------iv
目錄-------------------------------------------------------------------------------------------------v
圖次-------------------------------------------------------------------------------------------------vii
表次--------------------------------------------------------------------------------------------------x
第一章 緒論----------------------------------------------------------------------------------------1
1.1 研究背景與簡介-----------------------------------------------------------------------1
1.2 章節內容提要--------------------------------------------------------------------------3
第二章 功率放大器的分類與性能參數-------------------------------------------------------4
2.1 功率放大器的分類--------------------------------------------------------------------4
2.1.1電流源功率放大器-----------------------------------------------------------------4
2.1.2 定幅功率放大器-------------------------------------------------------------------9
2.2 功率放大器的性能參數-------------------------------------------------------------10
第三章 X參數模型應用於功率放大器設計------------------------------------------------17
3.1 功率放大器設計方式----------------------------------------------------------------17
3.1.1 直流分析--------------------------------------------------------------------------17
3.1.2 穩定度分析-----------------------------------------------------------------------19
3.1.3 負載拉移分析--------------------------------------------------------------------24
3.2 X參數基本介紹---------------------------------------------------------------------28
3.3 X參數預測功率與最佳阻抗點---------------------------------------------------28
3.4 功率放大器設計架構----------------------------------------------------------------31
3.5 功率放大器設計流程----------------------------------------------------------------31
第四章 X參數功率放大器量測與結果------------------------------------------------------34
4.1 簡介-------------------------------------------------------------------------------------34
4.2 量測儀器與方式-----------------------------------------------------------------------34
4.3 功率放大器實驗結果----------------------------------------------------------------36
4.4 X參數模型套入電路模擬-----------------------------------------------------------45
第五章 結論與未來展望-----------------------------------------------------------------------49

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