Circuit arrangement for synchronizing a frequency-controllable o

Details Circuit arrangement for synchronizing a frequency-controllable o Circuit arrangement for synchronizing a frequency-controllable o

1989-05-16

1991-03-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 17, 331 18, 331 25, H03L 7087, H03L 7113

Patent

active

050032720

ABSTRACT:
The invention relates to the synchronization of a frequency-controllable oscillator in a PLL circuit with a carrier. The adjustment of this oscillator to the carrier frequency can be dispensed with in that additionally a frequency discriminator is provided which initially tunes the oscillator in accordance with the frequency difference. The frequency discriminator compares each oscillator frequency with a stable reference frequency which is proximate to the desired frequency and tunes the oscillator until it is in the range of the reference frequency. Subsequently the frequency discriminator is blocked and the further synchronization is taken over by the phase discriminator in the PLL circuit.

REFERENCES:
patent: 3458823 (1969-07-01), Nordahl
patent: 3796962 (1974-03-01), Hekimian
patent: 3909743 (1975-09-01), Margala et al.
patent: 4320356 (1982-03-01), Perdue
patent: 4580107 (1986-04-01), Caldwell et al.
patent: 4787097 (1988-11-01), Rizzo

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