快速跳频PLL中杂散抑制比的最佳设计值

Optimum design value for spur suppression ratio in rapid frequency hopped PLL

系统地研究了快速跳频PLL中杂散来源,给出了环路杂散模型,定义了杂散抑制比。定性分析了MF SK FH通信系统检测误码率Pe与杂散抑制比λ之间的关系,并通过计算机辅助分析,定量计算出误码率与杂散抑制比的关系曲线。实验结果表明,MFSK FH通信系统中存在一个杂散抑制比的最佳设计值,约为-50dB,它为快速跳频PLL的优化设计提供了参考依据。

The sources and effects of spurs in a rapid frequency-hopped PLL are investigated, a model for analyzing spur effect is developed, and the spur suppression ratio is defined. The relationship between error probability (P-e) and spur suppression ration (λ) in MFSK-FH communication system is analyzed, and the relationship curves between error probability and spur suppression ratio are computed by computer aided anaysis. The curves show that there is an optimum design value for spur suppression ration in MFSK-FH communication system, which is about -50dB. The developed result is of great values to optimun design of rapid frequency-hopped PLL.;