Digital phase modulation of frequency synthesizer using modulate

Details Digital phase modulation of frequency synthesizer using modulate Digital phase modulation of frequency synthesizer using modulate

1997-08-05

1999-05-11

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 327107, 327115, 377 48, 332127, 455 76, 455112, H03L7/08

Patent

active

059031948

ABSTRACT:
A phase-locked loop frequency synthesizer system is provided using fractional frequency division and a fractional control number for phase modulating an output of the frequency synthesizer using an incoming information signal. The apparatus includes a delta-sigma converter which adjusts a divisor of the frequency divider by operating upon a magnitude modulated fractional frequency control number. The system further includes a differentiator which provides the magnitude modulated input stream to the delta-sigma modulator by modulating the fractional control number with detected differences in the incoming information signal.

REFERENCES:
patent: 5021754 (1991-06-01), Shepherd et al.
patent: 5038117 (1991-08-01), Miller

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