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一、引言 X70行同步集成电路由91个三极管、10个二极管和152个电阻,总共253个元件所组成。其方框图见图1。 此电路在行偏转系统中完成了全部小信号功能,诸如同步分离、噪声选通、行振荡和同步输出级等。它通过第一鉴相器,将行振荡波形与同步信号进行相位比较,取出正比于误差信号的电流控制行频,使之同步。通过第二鉴相器及可控移相器,自动补偿外围输出级开关延迟。还设有一致检测器,来鉴别行振荡器是否处于同步状态,从而自动调节第一鉴相器的跨导和滤波器的时间常数,以便适应保持和捕捉所需的不
I. INTRODUCTION X70 line synchronous integrated circuit consists of 91 triodes, 10 diodes and 152 resistors, a total of 253 components. The block diagram shown in Figure 1. This circuit completes all small signal functions in the line deflection system, such as sync separation, noise gating, line oscillation and synchronous output stages. It is through the first phase detector, the line oscillation waveform and the synchronization signal phase comparison, remove the signal proportional to the error current control line frequency to make it synchronized. Through the second phase detector and controllable phase shifter, automatically compensate for the peripheral output stage switching delay. A coincidence detector is also provided to identify whether the line oscillator is in a synchronized state, thereby automatically adjusting the transconductance of the first phase detector and the time constant of the filter so as to accommodate the desired