臺灣博碩士論文加值系統

第一章 緒論 1
1.1. 研究背景 1
1.2. 文獻探討 2
1.2.1. Doherty功率放大器的效率提升 2
1.2.2. GaN作為功率放大器的優勢 5
1.3. 研究動機 7
1.4. 論文架構 7
第二章 DOHERTY功率放大器的工作原理 9
2.1. 電晶體IV曲線和負載線 9
2.1.1. 電晶體IV曲線 9
2.1.2. 負載線 11
2.2. 功率放大器的工作模式 13
2.2.1. 導通角和波型 13
2.2.2. 功率放大器工作模式比較 19
2.3. 負載調變和Doherty功率放大器 22
2.3.1. 在不同負載下的功率放大器 22
2.3.2. 負載調變 23
2.3.3. Doherty功率放大器的工作原理 24
2.3.4. 補償線(Offset Line) 29
第三章 於印刷電路板使用GAN HEMT實現對稱DOHERTY功率放大器 35
3.1. 電路之目標參數 35
3.2. 實作電路材料及元件選擇 35
3.2.1. 電晶體 36
3.2.2. 板材 36
3.3. 威爾金森功率分配器 37
3.3.1. 爾金森功率分配器電路架構與模擬 37
3.4. 載波放大器 38
3.4.1. 靜態偏壓操作點 39
3.4.2. 直流偏壓電路 40
3.4.3. 穩定度分析 41
3.4.4. Load Pull 42
3.4.5. 輸入及輸出阻抗匹配 44
3.4.6. 模擬整體電路之小訊號與大訊號結果 45
3.5. 峰值放大器 47
3.5.1. 靜態偏壓操作點 47
3.5.2. Load Pull 48
3.5.3. 輸入及輸出阻抗匹配 50
3.5.4. 模擬整體電路之大訊號結果 51
3.6. Doherty功率放大器 53
3.6.1. Doherty功率放大器整體電路架構 53
3.6.2. 補償線 54
3.6.3. 以理想傳輸線模擬整體電路之大訊號與小訊號結果 55
3.6.4. 使用微帶線取代理想傳輸線 59
第四章 實作與量測結果 62
4.1. 量測器材架設 62
4.1.1. 功率分配器之三端口小訊號S參數量測設置 62
4.1.2. 功率放大器之雙端口小訊號S參數量測設置 64
4.1.3. 功率放大器之雙端口大訊號輸出量測設置 65
4.2. 威爾金森功率分配器 66
4.2.1. 實作威爾金森功率分配器及量測結果 66
4.2.2. 饋入線模擬設計 68
4.2.3. 使用新的饋入線重新實作功率分配器 70
4.3. 載波放大器 71
4.4. 峰值放大器 73
4.5. Doherty功率放大器 75
4.6. 文獻比較 79
第五章 於台積電0.18 ΜM CMOS實現非對稱DOHERTY功率放大器 80
5.1. 非對稱Doherty功率放大器 80
5.2. 電路之目標參數 81
5.3. 威爾金森功率分配器 82
5.4. 載波放大器 83
5.4.1. 靜態偏壓操作點 83
5.4.2. 直流偏壓電路 84
5.4.3. 穩定度分析 84
5.4.4. Load Pull 85
5.4.5. 輸入及輸出阻抗匹配 87
5.4.6. 模擬整體電路之小訊號與大訊號結果 88
5.5. 峰值放大器 90
5.5.1. 靜態偏壓操作點 90
5.5.2. Load Pull 91
5.5.3. 輸入及輸出阻抗匹配 93
5.5.4. 模擬整體電路之大訊號結果 94
5.6. Doherty功率放大器 96
5.6.1. Doherty功率放大器整體電路架構 96
5.6.2. 以理想傳輸線模擬整體電路之大訊號與小訊號結果 97
5.6.3. 使用集總元件取代理想傳輸線 100
5.6.4. Layout 103
第六章 結論和未來展望 104
6.1. 結論 104
6.2. 未來展望 105
參考文獻 107

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