Traveling adjusting control circuit

TLDR: In this article, a variable frequency divider is used to obtain a traveling adjusting synchronization clock with a wide range of a following characteristic, which can be used to synchronize and follow in wide range and to output a stable traveling adjusting clock by inputting an external reference clock.

Abstract: PURPOSE:To synchronize and follow in a wide range and to output a stable traveling adjusting synchronization clock by inputting an external reference clock, taking a synchronization by a phase locked loop,and dividing a synchronization clock thereof by a variable frequency divider to obtain the traveling adjusting synchronization clock. CONSTITUTION:An external reference clock is given to a phase detector 4 from an external reference clock input terminal 2 and constitutes a phase synchronization loop together with a voltage control crystal oscillator 5 to obtain a crystal originated oscillating master clock 10. A frequency comparator 7 inputs an external traveling adjusting signal from the master clock and an external traveling adjusting signal input terminal 1 and a frequency thereof is outputted to a variable divider 6 as a dividing ratio setting signal 9. The variable divider 6 inputs the master clock 10 and it is divided by the dividing ratio indicated by the dividing ratio setting signal 9 and outputted to a traveling adjusting synchronization clock output terminal 3. In such a manner, the traveling adjusting synchronization clock having the wide range of a following characteristic and the high accuracy can be obtained.