| 摘要: |
| 为了改善短波功放幅频特性曲线的不平坦性，并且能在天线调谐失调的情况下保护功
放，设计了一种数字化功率反馈控制系统。该系统根据功放输出端反馈的正向功率值和反向
功率值来实时调整发射机的输出，以保证输出功率稳定在期望值。系统由功率检测单元和DS
P单元组成，重点分析了功率反馈系统中功率检测电路的设计和DSP单元中的功率控制算
法流程。实测结果证明，该系统能使功放的输出功率稳定在期望值的±0.25 dB范围内
，并
且能有效防止因功率过冲烧毁功放。 |
| 关键词: 数字化短波发射机 功率控制 功率反馈；数字下变频 |
| DOI： |
|
| 基金项目: |
|
| Design and Implementation of a Power Feedback Control System for Digital Shortwave Transmitters |
| CUI Hao-gui,GAO Jun,QU Xiao-xu |
| (Department of Electronic Engineering, Naval University of Engineering,Wuhan 430
0
33,China) |
| Abstract: |
| A digital power feedback control system is desinged which can not only impro
ve the input-output characteristic curve of the power amplifier,but also pro
tect the power amplifier in the case of the antenna misadjusting. In order to en
sure the output power stability in the expectation,this system modulates the
output of transmitter based on the forward power value and reverse power value
of the transmitter in real time. The power feedback control system consists of t
he power detection unit and DSP unit.In this paper the design of p
ower detection circuit and the power control algorithm flow are focused.Experime
ntal results
show that this system can make the output power value stability in
±0.25 dB of the expectation, and can protect
the power amplifier effectively when the output power is too large. |
| Key words: digital shortwave
transmitter power control power feedback digital down converter(DDC) |
《电讯技术》编辑部 