Rapidly tunable frequency synthesizer with oscillator frequency

Details Rapidly tunable frequency synthesizer with oscillator frequency Rapidly tunable frequency synthesizer with oscillator frequency

1985-08-13

1986-09-16

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, H03L 700

Patent

active

046125167

ABSTRACT:
A frequency synthesizer of a type having a variable frequency divider includes a loop for locking the phase of a voltage-controlled oscillator (1), a search tuning loop in which, after a change in the displayed frequency, a digital search tuning data is formed which is converted into the control voltage for the oscillator. This synthesizer also includes translating means (9b) for translating the displayed frequency data into a digital presetting data whose values characterize sub-ranges to which the displayed frequency may belong, and means (14) for converting the said digital presetting data into a presetting voltage which is used to control the frequency of the oscillator, the values of the presetting voltage being determined to produce substantially the starting frequencies of the sub-ranges while the variation of the search tuning voltage is determined for producing a frequency variation which is substantially equal to the width of a sub-range.

REFERENCES:
patent: 3825855 (1974-07-01), Basset et al.
patent: 4024464 (1977-05-01), Underhill et al.
patent: 4105946 (1978-08-01), Ikeda
patent: 4234929 (1980-11-01), Riley, Jr.
patent: 4246547 (1981-01-01), Gerard et al.
patent: 4258333 (1981-03-01), Demuliere et al.
patent: 4404531 (1983-09-01), Genrich et al.

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