本文以一种简明的近似方法,导出了适用于采用任何环路滤波器的正弦鉴相锁相环路的捕捉带通用公式;论证了此通式应用于常用二阶环时,与历来所用近似公式的一致性;导出了最佳设计三阶环的捕捉带计算公式,并与高增益二阶环的捕捉带公式进行了比较。本文认为,此通式可取代以往所应用的众多的近似公式,供工程计算中使用 In this paper, a concise approximation method is derived to derive a generalized capture band suitable for a sinusoidal phase-locked phase-locked loop using any loop filter. The generalized second-order loop, The coincidence of the formulas is deduced. The calculation formula of the capture zone of the third-order loop with the best design is derived and compared with the capture zone formula of the second-order loop with high gain. This paper argues that this general formula can replace many of the approximate formulas used in the past for engineering calculations