Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls
Patent
1993-04-22
1994-10-11
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
With intermittent comparison controls
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.
Mis David
Ricoh & Company, Ltd.
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