Synchronised digital clock signal generator - uses model frequency signal and produces synchronising signal from harmonics of model signal to produce desired output

摘要

A synchronising reference is produced from a model signal, and a harmonic (F2) of the model signal. From these two signals a coarse output waveform is produced of the desired period, with a pulse width which is a multiple of the harmonic reference pulse width. The pulse width is then corrected by adding delayed edges from the model and reference signals to the leading and trailing edges of the coarse signal to produce the desired signal. A static memory is addressed by a counter clocked by the model signal and reset by the reference. Two identical numerical delay lines are used for the model and reference signals and the outputs are held in the static memory addressed by counters clocked by the output of the first delay and reset by the output of the second.