High frequency voltage controlled oscillator IC using diffusion

Details High frequency voltage controlled oscillator IC using diffusion High frequency voltage controlled oscillator IC using diffusion

1998-03-16

2000-09-05

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177R, H03B 518

Patent

active

061149195

ABSTRACT:
A variable high frequency voltage controlled oscillator (VCO) which is fully integrated. By controlling, with a control voltage, the collector current flowing through one transistor of the integrated oscillator circuit, the diffusion capacitance (also known as base-charging capacitance) of that transistor is varied. Since, in conjunction with an inductance, this capacitance to a large degree determines the frequency of oscillation of the integrated circuit, a fully integrated VCO is made possible.

REFERENCES:
patent: 3611195 (1971-10-01), Parham
patent: 4630006 (1986-12-01), Anderson
patent: 5055889 (1991-10-01), Beall
patent: 5107228 (1992-04-01), Pham et al.
patent: 5130674 (1992-07-01), Pham et al.
patent: 5187450 (1993-02-01), Wagner et al.
patent: 5191301 (1993-03-01), Mullgras, Jr.
Wyatt et al. "Varactorless HF Modulator", 1994 issue of Electronic Design, Oct. 3, 1994.

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