Rapid tuning, low distortion digital direct modulation phase loc

Details Rapid tuning, low distortion digital direct modulation phase loc Rapid tuning, low distortion digital direct modulation phase loc

1998-11-23

2000-12-05

Mis, David

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 16, 331 17, 331 23, 332100, 375303, 375305, 375376, 455260, H03C 300, H03L 7093, H03L 710, H03L 716, H04L 2712

Patent

active

061572713

ABSTRACT:
A direct modulation phase lock loop (PLL) a voltage controlled oscillator (VCO) (114). A divider (118) has a first divider input coupled to the VCO and a second divider input to receive a modulation inducing divisor sequence. A phase detector (102) has a first detector input coupled to the divider to receive the output thereof, and a second detector input to receive a reference input. A tuning circuit (306, 406) is coupled to the phase detector and the VCO, the tuning circuit responsive to a variable DC reference potential such that the tuning circuit has a frequency response that is constant over the modulation bandwidth whereby the PLL is a type 1 PLL with low modulation distortion.

REFERENCES:
patent: 3831195 (1974-08-01), Davis et al.
patent: 5424688 (1995-06-01), Phillips

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