L频段低谐波失真功率放大器的设计.pdf

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研究与开发
年第期
2005 5 RESEARCH & D EVELO PM ENT
文章编号: 1001 - 893X (2005) 05 - 0092 - 04
L 频段低谐波失真功率放大器的设计
李伟强,费元春
(北京理工大学信息科学技术学院电子工程系,北京 100081)
摘要:针对 L频段低谐波失真功率放大器的设计,进行线性与非线性电路分析仿真和电路的优化
设计。从理论上分析了甲乙类功率放大器的谐波失真特性,通过采用具有抑制谐波特性的输出匹配
电路以降低功放产生的谐波失真。测试得到电路的关键技术指标为:工作频率范围 1 390~1 510
MHz, 增益 35 dB , 1 dB压缩点 33 dBm, 并获得了满意的谐波抑制指标,在 1 480 MHz、输出功率 33
时二、三次谐波分别为和。结果表明在功放设计中优化设计输出匹配电路
3 dBm , - 70 dBc - 63 dBc ,
可以有效抑制功放的谐波失真。
关键词:数字移动通信;射频功率放大器;谐波失真;谐波抑制;输出匹配电路
中图分类号: TN918 6 文献标识码: A
Design of an L - Band Low Harmon ics D istortion Power Amplifier
L I W ei - qiang, FEI Yuan - chun
(Department of Electronic Engineering, School of Information Science and Technology, Beijing
Institute of Technology, Beijing 100081, China)
Abstract: To design an L - band low harmonics distortion power amp lifier, this paper simulates and op tim i
zes linear and nonlinear circuits. It analyzes the characteristics of class AB power amp lifier in theory. The
harmonics distortion is lowered by using low - pass output matching circuits. After testing, the key per
formances includes p ression point of 33dBm, frequency band of 1400~1500MHz, gain of 35dB.
Good harmonic supp ression performance is obtained: at 1480MHz and output power of 33dBm, the second
and third harmonics are as low as - 70dBc and - 63dBc. It shows that the harmonics distort