做DOHERTY功放的来分享一个资料

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【文件名】:12731@52RD_EFFICIENCY ENHANCEMENT OF BASE STATION POWER AMPLIFIERS USING DOHERTY TECHNIQUE.pdf
【格　式】:pdf
【大　小】:797K
【简　介】:
【目　录】:



Table of Contents
Abstract………………………………………………………………………….
ii
Acknowledgements……………………………………………………………...
iv
Table of Contents……………………………………………………………….
v
List of Figures…………………………………………………………………...
viii
List of Tables…………………………………………………………………….
xi
Glossary of Acronyms…………………………………………………………..
xii
1 INTRODUCTION……………………………………………………………
1
1.1 Background………………………………………………………………..
1
1.2 Research Goals……………………………………………………………
2
1.3 Report Organization……………………………………………………….
3
2 RF POWER AMPLIFIERS………………………………………………….
4
2.1 Classes of PA operation……………………………………………………
4
2.1.1 Class A……………………………………………………………….
5
2.1.2 Class B……………………………………………………………….
6
2.1.3 Class AB……………………………………………………………..
7
2.1.4 Class C……………………………………………………………….
8
2.2 Characteristics of power amplifiers………………………………………..
8
2.2.1 Linearity……………………………………………………………..
8
2.2.2 Measurement of Linearity……………………………………………
8
2.2.2.1 1 dB Compression point……………………………………
9
2.2.2.2 Intermodulation Distortion…………………………………..
10
2.2.2.3 Third order Intercept point…………………………………..
11
2.2.3 Efficiency……………………………………………………………
12
v
2.2.4 Noise…………………………………………………………………
12
2.3 LDMOS Power Transistors………………………………………………...
13
2.4 Conclusion………………………………………………………………….
14
3 DOHERTY POWER AMPLIFIERS………………………………………...
15
3.1 Introduction…………………………………………………………………
15
3.2 History of Doherty power amplifier………………………………………..
17
3.3 Conventional DPA using vaccum tubes……………………………………
18
3.4 The Modern Doherty power amplifier……………………………………...
19
3.5 The Active load-pull technique……………………………………………
20
3.6 Quarter wave transformer………………………………………………….
22
3.7 Characteristic impedance calculation………………………………………
23
3.8 Working Principle………………………………………………………….
27
3.8.1 Stage I (Low level output signals)…………………………………...
28
3.8.2 Stage II (Medium level output signals)……………………………...
29
3.8.3 Stage III (High level output signals)…………………………………
30
3.9 Performance of Doherty configuration……………………………………..
31
3.10 Advantages and Disadvantages……………………………………………
32
3.11 Conclusion…………………………………………………………………
33
4 DESIGN AND IMPLEMENTATION……………………………………….
34
4.1 Introduction…………………………………………………………………
34
4.2 WCDMA specifications…………………………………………………….
34
4.3 Design Architecture………………………………………………………...
35
4.4 Choice of class of operation………………………………………………..
36
4.5 Design Process……………………………………………………………...
4.5.1 Design of amplifier block…………………………………………….
37
37
4.5.2 DC Analysis………………………………………………….………
37
4.5.3 Determination of optimum load resistance…………………………..
39
vi
4.5.4 Input and Output matching…………………………………………..
40
4.5.5 Biasing……………………………………………………………….
41
4.5.6 Design of output combiner…………………………………………...
42
4.6 Implementation…………………………………………………………….
45
4.7 Conclusion………………………………………………………………….
45
5 SIMULATION AND RESULTS…………………………………………….
46
5.1 Introduction…………………………………………………………………
46
5.2 Doherty Amplifier I………………………………………………………...
46
5.2.1 Single tone simulations……………………………………………….
47
5.2.2 Two tone simulations…………………………………………………
51
5.3 Doherty Amplifier II………………………………………………………..
53
5.4 Comparison of Doherty topologies………………………………………....
57
5.5 Significance of load modulation……………………………………………
58
5.6 Effect of main stage biasing on DPA………………………………………
61
5.7 Effect of auxiliary stage biasing on DPA…………………………………..
63
5.8 Conclusion………………………………………………………………….
67
6 SUMMARY AND CONCLUSION………………………………………….
68
6.1 Summary……………………………………………………………………
68
6.2 Conclusion………………………………………………………………….
6.3 Future Directions…………………………………………………………...
69
69
References……………………………………………………………………….
70


这是我现在做DOHERTY看的最容易理解的一份论文！推荐！

bambooo

好好看一下，老外是怎么写的

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打不开啊？？？？？

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不错的文章

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为什么显示系统找不到文件，被坑了

zhaowei67572

[em20][em22][em22]

roundabout

不好玩

xiaohaoya1793

谢谢分享