一、引言长途电信多路载波机中,为了获得稳定的载波频率,常常用一个比较稳定的晶体振荡器去强迫同步一个载频电源LC振荡器。若被强迫同步的振荡器频率很低,那么,要制造与它相同频率的晶体振荡器来进行强迫同步就不方便。这时,晶体振荡器往往是设计成较高的振 I. INTRODUCTION In long-distance telecommunication multi-carrier carrier, in order to obtain a stable carrier frequency, a relatively stable crystal oscillator is often used to force a carrier frequency power supply LC oscillator to be synchronized. If the frequency of the oscillator being forcibly synchronized is low, then it is not convenient to create a crystal oscillator of the same frequency for forced synchronization. At this time, the crystal oscillator is often designed to higher vibration