Device for the control of a phase-locked loop with frequency cha

Details Device for the control of a phase-locked loop with frequency cha Device for the control of a phase-locked loop with frequency cha

1992-06-03

1993-06-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 16, 331 25, 331 30, H03L 716

Patent

active

052183246

ABSTRACT:
A device for the control of a phase-locked loop with frequency changing comprises an oscillator (10), a mixer (20) of signals, and a phase/frequency detector (40). The control device comprises a frequency comparator (60) to compare the frequency Fv of the signal given by the oscillator and the transposition frequency Fx, and an inhibiting circuit (70) sensitive to the frequency comparator and interposed between the mixer and the phase/frequency detector to block the beat frequency Fv-Fx at input of the phase/frequency detector. The disclosed device can be used to release the loop automatically during major changes in the loop control frequency F.

REFERENCES:
patent: 4095190 (1978-06-01), Imazeki et al.
patent: 4218656 (1980-08-01), Lazarus
patent: 4318055 (1982-03-01), Hopwood et al.
patent: 4523157 (1985-06-01), Sato
patent: 4682175 (1987-07-01), Lazarus
patent: 4739330 (1988-04-01), Lazarus
patent: 4792767 (1988-12-01), Lazarus et al.

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