Transformer for varying inductance value

Details Transformer for varying inductance value Transformer for varying inductance value

2008-05-13

2008-05-13

Nguyen, Tuyen T. (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

Reexamination Certificate

active

07372352

ABSTRACT:
There is provided a transformer for varying an inductance value, which adjusts a tuning range of the inductance without decrease of the inductor's capability by selectively connecting switches to inductors and controls an amount of magnetic flux. And the transformer consists of multiple inductors formed on a semiconductor substrate, which including N number of metal lines, N number of ports made by twisting the metal lines in the form of a symmetric circuit, wherein a certain number of ports among the N number of ports, which are connected to switch elements.

REFERENCES:
patent: 6707367 (2004-03-01), Castaneda et al.
patent: 6927664 (2005-08-01), Nakatani et al.
patent: 7151430 (2006-12-01), Mattsson
patent: 2005/0068146 (2005-03-01), Jessie
patent: 2006/0033602 (2006-02-01), Mattsson
patent: 2007/0052512 (2007-03-01), Jeon et al.
patent: 2007/0115086 (2007-05-01), Cairo Molins
patent: 1020040042130 (2004-05-01), None
“Demonstration of a Switched Resonator Concept ina Dual-Band Monolithic CMOS LC-Tuned VCO”, Seong-Mo Yim, et al., 2001 IEEE, pp. 205-208.
“Variable Inductance Multilayer Inductor With MOSFET Switch Control”, P. Park, et al, Mar. 2004 IEEE, vol. 25, No. 3, 2004pp. 144-146.

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