SYNCHRONIZING SIGNAL GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide a synchronizing signal generator which makes a sine wave of a crystal oscillator close to an ideal sine wave and outputs a pulse with little jitter. SOLUTION: This synchronizing signal generator converts a sine wave output of a crystal oscillator with a frequency f into a rectangular pulse by a pulse converter. The sine wave output of the crystal oscillator is made to pass through a filter, whose center frequency f is same as the oscillation frequency f, and inputted to the pulse converter. The filter is a crystal filter and has same frequency-temperature characteristics as the crystal oscillator. Crystal segments used for the crystal oscillator and the crystal filter have same cut angles. The oscillation frequency f is the frequency f1 of the fundamental wave component of the crystal oscillator. The pulse converter is a complementary output type driver IC.