Clock generator for digital demodulators

Details Clock generator for digital demodulators Clock generator for digital demodulators

1986-05-09

1987-06-09

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 25, 307526, 328133, H03L 700

Patent

active

046723293

ABSTRACT:
A clock generator for digital demodulators includes a voltage-controlled oscillator for generating clock pulses at controlled frequency and phase in response to error signals from phase and frequency comparators. The frequency comparator counts the clock pulse at longer periodic intervals to generate a first count representing a long-term measurement of the instantaneous clock frequency and further counts it at shorter periodic intervals to generate a second count representing a short-term measurement of the instantaneous clock frequency. The first count is compared with the limits of a narrow range to generate a first frequency control signal and the second count is compared with the limits of a wider range to produce a second frequency control signal. When the clock frequency goes out of the wide range, the short-term clock frequency detection causes the second frequency control signal to be generated quickly at a point in time earlier than the time the first frequency control signal is generated by the long-term clock frequency detection, so that the clock frequency is pulled into the wide range quickly for subsequent pull-in action by the long-term clock frequency detection into the narrow range.

REFERENCES:
patent: 4617526 (1986-10-01), Hikawa

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