Multi-function modulation and center frequency control port for

Details Multi-function modulation and center frequency control port for Multi-function modulation and center frequency control port for

1988-09-29

1990-05-15

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332127, 332136, 331 23, 331 36C, 331177V, 455113, H03C 308, H03C 309, H03C 322

Patent

active

049261444

ABSTRACT:
A circuit for use in conjunction with a voltage controlled oscillator (VCO). The circuit introduces modulation into a radio system (to create a substantially flat frequency response) at the same VCO port at which VCO frequency centering and negative bias control signals are introduced. A potentiometer is utilized both for providing an adjustable negative bias to the varactor in the VCO resonant circuit and for setting the VCO to the appropriate center frequency. Modulation compensation circuitry is coupled to the control arm of the potentiometer and to the anode of the varactor (via a choke 4). The modulation compensating circuitry is preferably designed to have a transfer function that is substantially the inverse of the closed loop transfer function of the phase locked loop system with respect to the frequency modulation of the VCO.

REFERENCES:
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patent: 3579281 (1971-05-01), Kam et al.
patent: 4303894 (1981-12-01), Akazawa
patent: 4442415 (1984-04-01), Ashida
patent: 4458215 (1984-07-01), Huang et al.
patent: 4470024 (1984-09-01), Leuenberger
patent: 4518933 (1985-05-01), Kroner
patent: 4607238 (1986-08-01), Kohsiek
patent: 4633197 (1986-12-01), Vanderspool, II
patent: 4721926 (1988-01-01), Aota
patent: 4721927 (1988-01-01), Aota et al.
patent: 4748425 (1988-05-01), Heck

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