Digital frequency synthesizer having selectable frequency offset

Details Digital frequency synthesizer having selectable frequency offset Digital frequency synthesizer having selectable frequency offset

1975-07-07

1977-01-11

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, H03B 304

Patent

active

040029956

ABSTRACT:
A digital frequency synthesizer includes a phase locked loop having dual presetting means for enabling the loop to generate a first frequency signal (e.g., "transmit" signal) for each of many selectable channels and generate a second frequency signal (e.g., "receiver" signal) in the form of the first frequency signal set off by an intermediate frequency (e.g., IF frequency) and programmable means for varying the frequency offset.

REFERENCES:
patent: 2846572 (1958-08-01), Elliott
patent: 3944925 (1976-03-01), De Laune

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