文献[1]系统地分析了各种型式的三阶锁相环,但对串联型三阶环仅进行了简单类比,不便于工程设计。本文详细地分析了串联型三阶锁相环的各种特性,建立了环路滤波器参数与环路性能的直接关系式,并给出了有关图表。利用这些关系式和图表可方便地进行串联型三阶环设计或直接验算环路性能。 Literature [1] systematically analyzed various types of third-order phase-locked loop, but only a simple analogy for the tandem third-order loop, which is not easy for engineering design. In this paper, the characteristics of a series-connected third-order phase-locked loop are analyzed in detail. The direct relationship between the parameters of the loop filter and the performance of the loop is established, and the related graphs are given. Use these relationships and graphs to easily implement a series-type third-order loop design or directly verify loop performance.