Fractional frequency synthesizer with modulation linearizer

Details Fractional frequency synthesizer with modulation linearizer Fractional frequency synthesizer with modulation linearizer

1998-06-09

1999-12-28

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

455112, 455113, 455119, H03C 309

Patent

active

060087048

ABSTRACT:
A method and apparatus are provided for modulating a frequency synthesizer with an adjusted frequency control word determined by adjusting a carrier frequency control word based upon a bit content of a unsigned modulation control word. The method includes the steps of inverting a most significant bit of the unsigned modulation control word to produce an adjusted modulation control word and replicating the inverted most significant bit and appending the replicated bits to a most significant bit side of the adjusted modulation control word to increase a width of the adjusted modulation control word to a width of the carrier frequency control word. The method further includes the step of adjusting the carrier frequency control word by adding the replicated bits and the adjusted modulation control word to corresponding bits of the carrier frequency control word.

REFERENCES:
patent: 5055802 (1991-10-01), Hietala et al.
patent: 5337024 (1994-08-01), Collins

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