Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls
Patent
1975-06-10
1976-11-09
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
With intermittent comparison controls
331 16, 331 17, H03B 308
Patent
active
039913821
ABSTRACT:
An oscillation frequency control device which comprises a voltage control local oscillator; a generator for giving forth an output having a predetermined referential frequency; means for periodically generating a gate pulse whose time width is equal to an integral multiple of the period of an output signal from said generator; a gate circuit for permitting the passage of an output signal from the local oscillator only during the time width of said gate pulse, wherein, while the local oscillator continues oscillation at a desired frequency, the number k of waves running through the gate circuit is chosen to be equal to an integral multiple of the counting capacity or the scale type n of a counter; said n-scale counter counts signals which have traveled through the gate circuit in at least one cycle for each supply period of the gate pulse, starting with the prescribed count at which said counter is initially reset; a count obtained in the final cycle is changed into an analog signal; comparison is made between a voltage represented by said analog signal and the referential voltage corresponding to the prescribed count at which the counter is initially reset; a differential voltage resulting from the outcome of said comparison is fed back to the local oscillator as a control voltage, thereby causing said oscillator to carry out oscillation only at desired frequencies.
REFERENCES:
patent: 3185938 (1965-05-01), Pelosi
patent: 3504294 (1970-03-01), Martin, Jr.
patent: 3644840 (1972-02-01), Conner
patent: 3710274 (1973-01-01), Basse
patent: 3753141 (1973-08-01), Elk et al.
patent: 3806825 (1974-04-01), Schlosser
patent: 3806826 (1974-04-01), Schlosser
Endo Yukihiro
Iida Hiroshi
Kominski John
Sansui Electric Co. Ltd.
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