VCO range shift and modulation device

Details VCO range shift and modulation device VCO range shift and modulation device

1987-02-18

1988-05-31

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 30V, 331 23, 331 36C, 331177V, H03C 322

Patent

active

047484250

ABSTRACT:
A modulation and range shift device for use with a PLL frequency synthesizer VCO. The modulation signal is provided to the negative side of the tuning varactor (16) of the VCO (14). In addition, variable voltages can be applied to the negative side of the tuning varactor (16) to achieve range shift as desired. Component variations in the modulation section (18) need not be varied to accommodate changes in the loop filter (12 and 13) of the PLL circuit.

REFERENCES:
patent: 3256498 (1966-06-01), Hurtig
patent: 3328727 (1967-06-01), Lynk, Jr.
patent: 3579281 (1971-05-01), Kam et al.
patent: 4330758 (1982-05-01), Swisher et al.
patent: 4375621 (1983-03-01), Schneiter et al.
patent: 4378534 (1983-03-01), Goedken et al.
patent: 4503402 (1985-03-01), Englund, Jr.
patent: 4510465 (1985-04-01), Rice et al.
patent: 4630008 (1986-12-01), Weeks

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