In general, the design of phase-lock loops has been done by a combination of linear analysis, phase plane plots, rule of thumb, and simulation.
锁相环一般采用线性分析，相平面图，近似计算法以及计算机模拟来设计。
Digital phase lock loops are widely adapted in nowadays communication systems. However, it is difficult to design the loop parameter precisely.
数字锁相环在实际通信系统中应用广泛，但其精确的环路参数设计比较困难。
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