Direct frequency synthesizer which is step-wise variable and has

Details Direct frequency synthesizer which is step-wise variable and has Direct frequency synthesizer which is step-wise variable and has

1984-10-24

1987-04-21

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 38, 331 49, 375 66, H03L 700, H03B 2102

Patent

active

046599991

ABSTRACT:
In a signal generator based on Direct Frequency Synthesis, a first reference frequency generator generates a signal of a reference frequency. A plurality of second reference frequency generators, respectively, generates K signals with different frequencies Asin(.omega..sub.1 t+.psi.), Asin(.omega..sub.2 t+.psi.) . . . Asin(.omega..sub.K t+.psi.), which are in phase at time point (t=0), in response to the output signal of the first reference frequency generator. A switching circuit selectively switches the output signals from the plurality of said second reference frequency generators. A timing pulse generator generates timing pulses to operate said switching circuit at time T as given by .vertline..omega..sub.i+1 T-.omega..sub.i T.vertline.=2l.pi. (l:integer) where i=1, 2 . . . K-1.

REFERENCES:
patent: 3223925 (1965-12-01), Florac et al.
patent: 3379992 (1968-04-01), Hoo
patent: 3444320 (1969-05-01), Miyagi
patent: 3735269 (1973-05-01), Jackson
Search Report issued in corresponding British Applications (1,347,512 and 906,390).
"Frequency Synthesis: Techniques and Applications" IEEE Press.

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