Wide-range fine-step vector modulator frequency synthesizer

Details Wide-range fine-step vector modulator frequency synthesizer Wide-range fine-step vector modulator frequency synthesizer

1997-04-01

1999-02-16

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 327107, 327159, 375376, H03L 7081

Patent

active

058724869

ABSTRACT:
A frequency synthesizer comprises a voltage controlled oscillator (VCO) with an output frequency f.sub.out that is dependent on a VCO-control voltage input. A divide-by-k counter is connected to receive the output frequency f.sub.out and to output a pair of in-phase and quadrature phase signals f.sub.k. A vector modulator is connected to receive the in-phase and quadrature phase signals f.sub.k and the output frequency f.sub.out, and outputs a single sideband (SSB) modulated output f.sub.n comprising only one of the sum (f.sub.out +f.sub.k) or difference (f.sub.out -f.sub.k) products. A divide-by-n counter is connected to receive the modulated output f.sub.n and to output a feedback frequency sample f.sub.f. And a phase detector is connected to receive the feedback frequency sample f.sub.f and to compare it with a reference frequency f.sub.r. A phase error output signal is provided for the VCO-control voltage input.

REFERENCES:
patent: 5444420 (1995-08-01), Wernlund

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