本文研究正弦干扰信号在锁相环(PLL)中的作用。在第一部分对一阶锁相环以及在一定条件下也对二阶销相环讨论和分析了干扰信号引起失锁的不利作用。在第二部分中也讨论了其有利作用。如果锁相环不锁于某需锁信号,则在一定条件下干扰信号能使锁相环锁于该需锁信号。 This paper investigates the role of sinusoidal interfering signals in a phase-locked loop (PLL). In the first part of the first-order phase-locked loop and under certain conditions for the second-order phase-locked loop discussed and analyzed the interference signal caused by the adverse effects of loss of lock. The second part also discusses its beneficial effects. If the phase-locked loop is not locked in a required lock signal, under certain conditions, the interference signal can lock the phase locked loop in the required lock signal.