微波功率放大器線性度改善研究｜國立中央大學博碩士論文系統

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研究生：	蔡翊翔 I-Hsiang Tsai
論文名稱：	微波功率放大器線性度改善研究 A study of linearity improvement for microwave power amplifier
指導教授：	辛裕明 Yue-Ming Hsin
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 電機工程學系 Department of Electrical Engineering
畢業學年度：	98
語文別：	中文
論文頁數：	103
中文關鍵詞：	線性度、功率放大器
外文關鍵詞：	power amplifier, linearity
相關次數：	點閱：9 下載：0
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本論文主要分為兩個部分，第一部份：利用量測砷化鎵異質接面雙極性電晶體的增益壓縮與相位漂移特性，經過公式轉換後取得描述電晶體非線性特性的輸出電壓之實部與虛部對輸入電壓的冪級數係數，再經過計算後用來預測電晶體在實際調變訊號(CDMA IS-95)下對於不同輸入功率的輸出頻譜特性以及鄰近通道功率比例。第二部份：利用0.5 μm pHEMT製程設計3.5 GHz線性化功率放大器，利用共閘級電晶體動態調整功率放大器的偏壓改善功率放大器的線性度。量測結果功率增益、輸出功率、最大功率附加效率分別為11 dB、29 dBm、31 %。0.18 μm CMOS製程設計2.4 GHz線性化功率放大器，利用前饋式元件提供二倍頻訊號消除的路徑改善功率放大器的線性度。量測結果功率增益、輸出功率、最大功率附加效率分別為16 dB、21 dBm、17 %；在輸出功率為12 dBm下，相對星座圖向量誤差量測結果為5.6 %，滿足IEEE 802.11 g系統的規格。

The research content divides into two parts: First, measured GaAs-based heterojunction bipolar transistor amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) characteristics. Obtain the power series coefficients of output voltage real part and image part versus input voltage to describe the transistor non-linear characteristics using a formulation. After calculation can prediction the transistors output spectrum characteristics and adjacent channel power ratio under different output power with a CDMA IS-95 signal. Secondly, a 3.5 GHz linearity power amplifier in WIN 0.5 μm pHEMT process, a common gate transistor can adjust power amplifier bias to improve linearity. The power amplifier exhibits power gain of 11 dB, saturation output power of 29 dBm, maximum power-added efficiency of 31 %. A 2.4 GHz linearity power amplifier in TSMC 0.18 μm CMOS process, the feed-forward device offer second harmonic signal injection route to improve linearity. The power amplifier exhibits power gain of 16 dB, saturation output power of 21 dBm, maximum power-added efficiency of 17 %. The measured error vector magnitude was 5.6 % under an output power of 12 dBm using 2.4 GHz IEEE 802.11 g OFDM 64-QAM signal.

摘要 ............................................................................................................................................ I
Abstract ................................................................................................................................... II
致謝 ......................................................................................................................................... III
目錄 ......................................................................................................................................... IV
圖目錄 ..................................................................................................................................... VI
表目錄 ...................................................................................................................................... X
第一章 緒論 .................................................................................................................... 1
1.1 研究背景與動機 ................................................................................................ 1
1.2 相關研究現況 .................................................................................................... 2
1.3 論文架構 ............................................................................................................ 4
第二章 微波功率放大器基本原理與線性度改善 ........................................................ 5
2.1 簡介 .................................................................................................................... 5
2.2 微波功率放大器基本原理 ................................................................................ 5
2.2.1 主動電晶體選擇 ................................................................................................ 5
2.2.2 功率放大器的分類 ............................................................................................ 6
2.2.3 電路穩定性考量 ................................................................................................ 7
2.2.4 輸入與輸出阻抗匹配 ........................................................................................ 8
2.3 微波功率放大器非線性 .................................................................................... 9
2.3.1 增益壓縮與相位漂移 ........................................................................................ 9
2.3.2 交互調變失真 .................................................................................................. 11
2.3.3 鄰近通道功率比例 .......................................................................................... 12
2.3.4 誤差向量幅度 .................................................................................................. 14
2.4 功率放大器線性化方法 ............................................................................................... 14
2.4.1 預先失真線性化技術 ...................................................................................... 14
2.4.2 前饋式線性化技術 .......................................................................................... 15
2.4.3 負回授線性化技術 .......................................................................................... 16
2.4.4 數位預先失真線性化技術 .............................................................................. 17
2.4.5 波包消除重建法 .............................................................................................. 18
V
2.5 結論 .................................................................................................................. 18
第三章 非線性效應計算 .............................................................................................. 19
3.1 簡介 .................................................................................................................. 19
3.2 非線性效應係數粹取 ...................................................................................... 20
3.3 計算輸出頻譜特性 .......................................................................................... 27
3.4 量測與模擬結果 .............................................................................................. 29
3.4.1 量測架構 .......................................................................................................... 29
3.4.2 調變訊號量測結果 .......................................................................................... 31
3.5 結論 .................................................................................................................. 38
第四章 線性度改善功率放大器 .................................................................................. 39
4.1 簡介 .................................................................................................................. 39
4.2 3.5 GHz E-mode pHEMT線性化功率放大器 ................................................ 39
4.2.1 E-mode pHEMT線性化功率放大器設計 ....................................................... 39
4.2.2 E-mode pHEMT線性化功率放大器量測與結果比較 ................................... 45
4.3 2.4 GHz CMOS線性化功率放大器 ................................................................ 54
4.3.1 CMOS線性化功率放大器設計 ....................................................................... 54
4.3.2 CMOS線性化功率放大器量測與結果比較 ................................................... 60
4.4 結論 .................................................................................................................. 69
第五章 結論 .................................................................................................................. 70
參考文獻 ................................................................................................................................. 71
附錄A 2.4 GHz BiFET線性化功率放大器 ........................................................................... 74
A.1 BiFET線性化功率放大器設計 ....................................................................... 74
A.2 BiFET線性化功率放大器量測與結果比較 ................................................... 77
A.3 結論 .................................................................................................................. 80
附錄B 2.4 GHz SiGe線性化功率放大器 ............................................................................... 81
B.1 SiGe線性化功率放大器設計 .......................................................................... 81
B.2 SiGe線性化功率放大器量測與結果比較 ...................................................... 85
B.3 結論 .................................................................................................................. 86
附錄C 口試問題回答 ............................................................................................................. 87

                                

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