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本文从分析调相负反馈锁相接收机出发,导出了具有滞后环节的带通锁相环的数学模型和等效相位模型。分析了当环路滤波器为单调谐带通滤波器时,具有滞后环节的带通锁相环线性等效相位模型的稳定性,闭环频率响应以及正弦调相稳态相位误差响应,其结果可供带通锁相环工程设计参考。实验表明,分析结果与实验测试结果是一致的。解调调频信号的带通锁相环和调相负反馈环具有一样的等效相位模型,本文讨论的结果也适用于解调调频信号的带通锁相环。
Based on the analysis of phase-locked negative feedback PLL, the mathematical model and equivalent phase model of band-pass PLL with hysteresis are derived. The stability of the linear equivalent phase model for the band-pass phase-locked loop with hysteresis loop, the closed-loop frequency response and the steady-state phase error response of sinusoidal phase modulation are analyzed when the loop filter is a single tuned bandpass filter. The result is For the band-pass phase-locked loop engineering design reference. Experiments show that the analysis results are consistent with the experimental test results. The band-pass phase-locked loop and the phase-modulated negative feedback loop of the demodulated FM signal have the same equivalent phase model. The results discussed in this paper are also applicable to the band-pass phase-locked loop of the demodulated FM signal.