Low-cost VCO using lumped elements in microwave band

Details Low-cost VCO using lumped elements in microwave band Low-cost VCO using lumped elements in microwave band

1985-06-21

1986-11-25

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

H03B 520

Patent

active

046251839

ABSTRACT:
A voltage controlled oscillator (VCO) for a television tuner for tuning a large number of television channels, including signals in the microwave frequency range, the VCO comprising a printed circuit (PC) board having a dielectric substrate, a patterned metal layer on one side of the substrate, and a substantially continuous metal layer forming a ground plane on the other side of the substrate, a transistor mounted on the ground plane side of the PC board, and having emitter, base and collector leads projecting laterally from the transistor, the base of the transistor being connected to the ground plane, a d-c supply circuit connected to the transistor, a tuned circuit connected across the collector and emitter of the transistor, the tuned circuit including at least one ground connection to the ground plane of the PC board, the d-c supply circuit, the tuned circuit, and the transistor having values which produce an oscillating output at a frequency of at least one GHz, and the ground connections being interconnected by a continuous wide area of the ground plane to provide a short-distance, low-loss path for ground currents at the operating frequency of the VCO.

REFERENCES:
patent: 3940714 (1976-02-01), Sato
patent: 4494081 (1985-01-01), Lea et al.
patent: 4564822 (1986-01-01), Saitoh et al.

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