Phase-locked loop with memory storing control data controlling t

Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls

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331 16, 331 17, 331176, 455260, H03L 102, H03L 710, H03L 718

Patent

active

053550986

ABSTRACT:
A phase-locked loop with memory storing control data. The control data to be given to a voltage-controlled oscillator in a phase-locked loop is addressed in accordance with an oscillation condition including the frequency of a reference signal, a dividing ratio of the frequency divider and ambient air temperature. When the phase-locked loop is controlled off, the control voltage for the voltage-controlled oscillator is changed into digital data by an analog-to-digital converter to be transferred to the memory. The digital data or control data is read out from the memory when the phase-locked loop is controlled on. The control data is then changed into analog equivalent as control voltage supplied to the voltage-controlled oscillator, shortening the locking-up time.

REFERENCES:
patent: 4906944 (1990-03-01), Frerking
patent: 4980652 (1990-12-01), Tarusawa et al.

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