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本文建议在分析复杂锁相环时,把压控振荡器(VCO)和环路滤波器之外的所有其它部件等效地看成是一个鉴相器。这种观点符合自动控制系统的一般原理,有助干回答一些含糊不清的问题,并为充分利用典型锁相环的理论来分析复杂环路的问题提供了方便。文中求出了一些复杂环路的等效鉴相器特性,从而可以评价它们的某些性能。作为一个用例,本文讨论了各种窄带锁相环对输入信号中各频谱成分的锁定能力,澄清了一些问题。
This paper suggests that all other components except voltage controlled oscillator (VCO) and loop filter are equivalently considered as a phase detector when analyzing complex PLLs. This view is in line with the general principles of automatic control systems and helps to answer some vague questions and to facilitate the analysis of complex loops using the theory of typical phase-locked loops. In this paper, some complex phase detector characteristics of the equivalent loop, which can evaluate some of their performance. As a use case, this article discusses the locking capabilities of various narrowband phase-locked loops for various spectral components in the input signal, clarifying some of the issues.