Frequency synthesizing circuit

Details Frequency synthesizing circuit Frequency synthesizing circuit

1984-05-07

1986-05-20

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331 60, 331 74, 331177V, H03L 700

Patent

active

045904391

ABSTRACT:
A frequency synthesizer circuit of the phase-locked loop type for receiving a reference signal and generating in response thereto a plurality of local oscillator (LO) output signals is provided. The synthesizer includes a varactor-controlled oscillator having one or more hyperabrupt varactor tuning diodes for providing an octave bandwidth phase-locked loop output RF, and a plurality of series-connected emitter-coupled logic (ECL) circuits connected to the output of the varactor-controlled oscillator for generating a plurality of local oscillator output signals RF/N, where N=2.sup.x, x=1, 2, 3 . . . . The frequency synthesizer also includes a programmable frequency divider in the feedback loop thereof for reducing the frequency of the phase-locked loop output signal RF by a selectable factor.

REFERENCES:
patent: 3579281 (1971-05-01), Kam
patent: 3701040 (1972-10-01), Borrevik et al.
patent: 4068198 (1978-01-01), Otto
patent: 4463321 (1984-07-01), Horner

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