Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1988-07-28
1989-08-29
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331 27, 331DIG2, H03L 718
Patent
active
048621056
ABSTRACT:
A frequency synthesizer including an oscillator (1) whose frequency is controlled by a tuning signal (TS), a phase detector (4) and a phase lock loop circuit (5, 6). A tuning indicator (7) has a tolerance on the phase difference between the tuning frequency signal and the reference frequency signal. The phase detector produces a first (PS1) and a second (PS2) phase signal upon leading and lagging, respectively, of the phase between the tuning frequency signal (F.sub.T) and a reference frequency signal (F.sub.R). The tuning indicator includes delay circuits provided at the input of AND-gates in such manner as to cancel the phase signals (PS1) and (PS2) of a duration less than a predetermined duration, and a register producing a confirmed tuning indication signal (IS) only when the phase signals (PS1) and (PS2) indicate stable tuning during at least two consecutive periods of the reference frequency (F.sub.R).
REFERENCES:
patent: 4437072 (1984-03-01), Asami
patent: 4473805 (1984-09-01), Guhn
Dan Hill, "Out-of-lock Detector for Automatic Phase Control", Electronic Design, Nov. 8, 1965, pp. 53-54.
Cowley Nicolas P.
Walbrou Pascal
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