| 前馈与Doherty技术结合的功放研究 |
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| 引用本文： | 张玉怀,易惊涛,张玉兴. 前馈与Doherty技术结合的功放研究[J]. 杭州应用工程技术学院学报, 2008, 0(1): 15-21 |
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| 作者姓名： | 张玉怀 易惊涛 张玉兴 |
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| 作者单位： | 电子科技大学电子工程学院,成都610051 |
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| 摘 要： | 将前馈技术与Doherty技术相结合，以满足功率放大器在效率和线性度方面的要求，同时对前馈系统幅度、相位、延时不平衡的影响进行了分析，就其效率因素和增强效率的方法进行了讨论；还分析了Doherty功率放大器中峰值放大器的栅极偏压（Vgs）和峰值补偿线长度对获得峰值效率点的影响，最后把用LDMOS管设计的Doherty功放作前馈系统的主功放，与平衡结构作主功放的前馈系统相比较，仿真结果显示IMEh达到-65dBc时，其效率提高了5％。
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| 关 键 词： | 功率放大器 前馈技术 Doherty技术 非线性 效率 LDMOS |
Research of feed-forward and Doherty technology used power amplifier |
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| ZHANG Yu-huai,YI Jing-tao,ZHANG Yu-xing. Research of feed-forward and Doherty technology used power amplifier[J]. Journal of Hangzhou Institute of Applied Engineering, 2008, 0(1): 15-21 |
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| Authors: | ZHANG Yu-huai YI Jing-tao ZHANG Yu-xing |
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| Affiliation: | (School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610051, China) |
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| Abstract: | A Doherty-feed-forward power amplifier for improving the efficiency and linearity was presented. Influence to the amplitude, the phase and the time delay mismatch of the feedforward system has been analyzed, and the efficiency factor and the method of efficiency enhancement is discussed. Also the peaking amplifier bias and influence of peaking compensate line length to peaking efficiency point is analyzed. Finally the LDMOS field-effect transistor is used to design the Doherty-Feed-forward power amplifier, compared with the balance structure Feed-forward amplifier, simulation result shows its efficiency enhanced 5% when IMD3 is -65 dBc. |
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| Keywords: | power amplifier Feed-forward Doherty nonlinearity efficiency LDMOS |
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