含有传播时延的锁相环是移动数字通信系统和时分多址卫星通信系统中的关键部件。传播时延对锁相环的性能产生较大的影响,本文采用解析和图解的方法研究了含有传播时延锁相环的稳定条件,以及锁定过程的频率锁定范围。这些条件为环路的设计.参量的选择提供了必要的依据。 Phase-locked loop with propagation delay is a key component in both mobile digital communications systems and time division multiple access satellite communications systems. The propagation delay has a great influence on the performance of the PLL. In this paper, the stability conditions of the PLL with propagation delay and the range of frequency locking of the locking process are studied by using the analytical and graphical methods. These conditions for the loop design. The choice of parameters provides the necessary basis.