Frequency synthesizer systems and methods for three-point modula

Details Frequency synthesizer systems and methods for three-point modula Frequency synthesizer systems and methods for three-point modula

1997-07-30

1998-11-10

Mis, David

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332128, 331 16, 331 17, 331 23, 327105, 327156, 455260, 341143, H03C 300, H03C 100, H03K 702, H03L 718

Patent

active

058349871

ABSTRACT:
A frequency synthesizer includes a controlled oscillator which is responsive to a frequency control input signal, to generate an output frequency. A programmable frequency divider is responsive to the output frequency and to a divider control input, to divide the output frequency by a first integral ratio or by a second integral ratio in response to the divider control input, to thereby produce a divided signal. A phase comparator is responsive to a reference frequency signal and to the divided signal, to compare the reference frequency signal and the divided signal, and thereby produce a first error signal. A sigma-delta modulator is responsive to a modulation input to produce the divider control input. A loop filter is responsive to the first error signal, to thereby produce the frequency control input signal. Ripple compensation signals and direct modulation signals may also be provided, to provide a three-point modulator for a frequency synthesizer. Analog and digital embodiments may also be provided.

REFERENCES:
patent: 4179670 (1979-12-01), Kingsbury
patent: 5095288 (1992-03-01), Dent
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5150082 (1992-09-01), Grimmett et al.
patent: 5180993 (1993-01-01), Dent
patent: 5311152 (1994-05-01), Lautzenhizer
patent: 5424688 (1995-06-01), Phillips

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