Digital synthesizer

Details Digital synthesizer Digital synthesizer

1975-01-23

1976-04-06

Safourek, Benedict V.

Oscillators

Relaxation oscillators

331 1A, 332 18, H03B 308

Patent

active

039493059

ABSTRACT:
In order to produce signals having a desired communication channel frequency, a phase locked loop is provided, along with appropriate frequency division. For channels in the megahertz range having bandwidth in the kilohertz range, a kilohertz reference is provided for comparison, to drive the voltage controlled oscillator. The oscillator output is divided by the megahertz quantity, and by optional division multiples in the kilohertz channel range. In particular, a first division ratio is utilized for a portion of a reference cycle, and a second division ratio for the remainder of this cycle. Preloaded logic controls the two division rates, and by adjusting the portions of the cycle, correspondingly regulates the effective division ratio for the loop, and yields the proper channel frequency for locking.

REFERENCES:
patent: 3372339 (1968-03-01), Harrison et al.
patent: 3657658 (1972-04-01), Kubo
patent: 3696422 (1972-10-01), Burrell
patent: 3805192 (1974-04-01), Ocnaschek et al.

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