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鉴相器为取样保持电路的自动相位控制系统之用途,是产生准确地等于基准频率的谐波或分谐波频率的压控振荡器输出。倍频时要求鉴相器以基准速率开关,而分频则控压控振荡器开关。其方法在参考文献1中作了较详细的讨论,并已有过某些应用。但分频时的稳定问题尚未作过研究,本文拟对比问题进行简单分析。要阐明的主要结论是最大容许控制范围随分频比而减小;与此相反的是倍频比并不影响稳定条件。分频时,脉冲序列是压控振荡器输出sin(ω_ot+φ)的失真部分,基准信号为正弦信号-VsinMω_ot,其中M为整数(图)。
The use of a phase detector as an automatic phase control system for a sample-and-hold circuit is a voltage-controlled oscillator output that produces harmonics or sub-harmonic frequencies exactly equal to the reference frequency. Frequency multiplier requires the phase detector to switch at the reference rate while the frequency divider controls the voltage-controlled oscillator switch. The method is discussed in more detail in Reference 1, and some applications have been made. However, the stability of the crossover has not yet been studied, this paper to be comparative analysis of a simple analysis. The main conclusion to be clarified is that the maximum allowable control range decreases with the frequency division ratio; in contrast, the frequency multiplication ratio does not affect the stability condition. When dividing, the pulse sequence is the distortion part of the voltage controlled oscillator output sin (ω_ot + φ), and the reference signal is a sinusoidal signal -VsinMω_ot, where M is an integer (figure).