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1、前言: 本文主要是研究黑白电视同步机定时部份自动频率相位微调电路工作的稳定性。它的系统方块图如下图所示: 图中D代表鑑相器,它为一带有储能电容的双二极管门电路;φ代表滤波器,它是一简单的RC积分电路;A代表直流放大器;O代表主振(在实际电路中,主振后面还有625:1的分频器,为了讨论简化起见,认为分频器的同步频带足够宽,不致因它而影响系统的稳定工作,因此,在分析时可不考虑它)。当正弦信号(同步信号)与脈冲信号(被同步信号)间存在相位或频率差别时,则鑑相器将输出一电压,它经过滤波和放大之后,加到主振器的
1, Preface: This article mainly studies the stability of the automatic frequency phase trimming circuit of the timing part of the black and white TV synchronous machine. Its system block diagram is shown as follows: In the picture D represents the phase detector, it is a double diode gate circuit with storage capacitor; φ represents the filter, it is a simple RC integral circuit; A represents the direct current amplifier; O on behalf of the main oscillator (in the actual circuit, the main oscillator behind 625: 1 divider, for the sake of simplification, that the frequency divider synchronization band wide enough, it will not affect the stability of the system work, therefore, In the analysis can not consider it). When there is a phase or frequency difference between the sinusoidal signal (synchronization signal) and the pulse signal (synchronized signal), the phase detector outputs a voltage which is filtered and amplified and applied to the main oscillator