Stub transformer for power supply impedance reduction

Details Stub transformer for power supply impedance reduction Stub transformer for power supply impedance reduction

2005-02-22

2005-02-22

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S033000, C333S263000

Reexamination Certificate

active

06859115

ABSTRACT:
A computer power supply system for reducing the AC impedance of a DC power supply (52) at inputs pins of a computing device (54) such as a processor. A quarter wavelength transmission line stub (58) is connected to a computing device DC power supply input pin. The stub is open circuited at its end opposite the pin. The wavelength is selected to match a frequency at which power supply impedance is known to be high. The stub appears as a low impedance at the selected frequency. Multiple stubs at different frequencies may be used to provide reduced impedance over a broader frequency band. Stubs may be formed from printed circuit board traces on a motherboard of from metalization patterns on a computing device package.

REFERENCES:
patent: 3662294 (1972-05-01), Jacobs et al.
patent: 6101295 (2000-08-01), Mineo et al.
patent: 6525630 (2003-02-01), Zhu et al.
Audio/Modem Riser Specification, Intel Corporation, Revision 1.01, Sep. 10, 1998, pp. 1-24.*
“Engineering Electromagnetic Fields and Waves,” Carl T. A. Johnk, John Wiley & Sons, Inc., 1975, pp. 568-570.

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