Phase locked frequency synthesizer with single input gain compen

Details Phase locked frequency synthesizer with single input gain compen Phase locked frequency synthesizer with single input gain compen

1988-09-15

1989-09-05

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332127, 455113, H03C 308, H03C 309

Patent

active

048642576

ABSTRACT:
Several embodiments are disclosed of a modulation equalization network associated with a phase locked loop to achieve frequency independent modulation of the VCO. The equalization network is disposed to introduce the modulation signal into the control loop ahead of the loop filter but after the phase detector output. The interposed equalization network requires only a single input port to achieve a flat modulation response thereby lending itself to a modular implementation. The modulation processing is performed totally outside the phase locked loop. The network serves to provide a boost to low frequency signals from the modulation source using an integrator network while providing a high frequency response that is essentially the inverse of the phase locked loop filter response.

REFERENCES:
patent: 4052672 (1977-10-01), Enderby et al.
patent: 4117422 (1978-09-01), Hunt
patent: 4140981 (1979-02-01), Bergman
patent: 4189689 (1980-02-01), Triplett
patent: 4242649 (1980-12-01), Washburn, Jr.
patent: 4313209 (1982-01-01), Drucker
patent: 4503402 (1985-03-01), Englund, Jr.
patent: 4510465 (1985-04-01), Rice et al.
patent: 4554517 (1985-11-01), Parniere et al.

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