Voltage-controlled oscillator having three or more varactor diod

Details Voltage-controlled oscillator having three or more varactor diod Voltage-controlled oscillator having three or more varactor diod

1982-12-21

1985-08-20

LaRoche, Eugene R.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

331 36C, 331117R, H03B 508

Patent

active

045367248

ABSTRACT:
In a voltage-controlled oscillator having an LC resonant circuit including a varactor circuit so that resonant frequency is controlled by a D.C. bias or control voltage applied to the varactor circuit, three or more varactors are connected in series in one embodiment so that a high-frequency voltage applied to the varactor circuit is divided into a plurality. The varactors may be connected in the same direction or opposite direction. In another embodiment, a plurality of series circuits of varactors are connected in parallel to provide the varactor circuit, where each series circuit comprises two or more varactors. A series-parallel connection of a plurality of varactors may be arranged in a matrix. In order to reduce undesirable stray capacitance, some or all varactors are attached to a printed circuit board so that they are normal to the plane of the printed circuit board. In one embodiment an auxiliary printed circuit board is employed so that some varactors are spaced from a main circuit board. The voltage-controlled oscillator of the invention shows high carrier-to-noise ratio throughout a wide frequency range.

REFERENCES:
patent: 3670205 (1972-06-01), Dixon et al.
patent: 4297654 (1981-10-01), Goerth
patent: 4353038 (1982-10-01), Rose et al.
patent: 4378532 (1983-03-01), Burgoon

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