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本文利用相平面分析方法,讨论了在鉴相器输出端接有非线性比例积分滤波器的锁相回路的捕获带宽。在分析中,对鉴相器考虑实际中最常碰到的正弦特性,同时考虑了电压控制振荡器(VCO)的实际饱和非线性。导出了系统的捕获带宽与校正网络非线性系数、校正网络时间常数和VCO非线性系数之间的关系式,并讨论了几种特殊情况。文中附有实验结果。理论结果与实验结果基本吻合。
In this paper, the phase-plane analysis method is used to discuss the capture bandwidth of the PLL with the nonlinear proportional-integral filter connected to the output of the phase detector. In the analysis, the phase detector considers the most commonly encountered sinusoidal behavior in practice, taking into account the actual saturated nonlinearity of the voltage controlled oscillator (VCO). The relationship between the system’s acquisition bandwidth and the calibration network nonlinearity coefficient, the correction network time constant and the VCO nonlinearity coefficient are derived and several special cases are discussed. Text attached to the experimental results. The theoretical results are basically consistent with the experimental results.