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DSP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。
A digital power feedback control system is desinged which can not only improve the input - output characteristic curve of the power amplifier, but also protect the power amplifier in the case of the antenna ntis,ad- justing. In order to ensure 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 the power detection unit and DSP unit. In this paper the design of power de- tection circuit and the power control algorithm flow are focused. Experimental 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 ef- fectively when the output power is too large.
出处
《电讯技术》
北大核心
2011年第8期134-137,共4页
Telecommunication Engineering
关键词
数字化短波发射机
功率控制
功率反馈
数字下变频
digital shortwave transmitter
power control
power feedback
digital down converter（DDC）
