Phase locked frequency synthesizer with single input wideband mo

Details Phase locked frequency synthesizer with single input wideband mo Phase locked frequency synthesizer with single input wideband mo

1988-09-15

1989-09-12

LaRoche, Eugene R.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 23, 455113, H03C 300

Patent

active

048664049

ABSTRACT:
A single input wideband modulation system for a phase locked loop is achieved by interposing the inverse analogue of the closed phase locked loop transfer function between the modulation source and the VCO modulation input. A first branch of the interposed circuit directly passes high frequency signals from the modulation source to a summing device tied to an input of the VCO. A second branch of the interposed circuit boosts low frequency signals and blocks high frequency signals recieved from the modulation source and passes such signal to the summing device where signals from the first and second branches are summed to permit wideband modulation of the VCO. All the modulation processing is performed outside the phase locked loop.

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: 4409563 (1983-10-01), Vandegraaf
patent: 4503402 (1985-03-01), Englund, Jr.
patent: 4510465 (1985-04-01), Rice et al.
patent: 4554517 (1985-11-01), Parniere et al.
patent: 4581749 (1986-04-01), Carney et al.

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