The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2005
Filed:
Mar. 28, 2002
Tom J. Hirsch, Austin, TX (US);
Benjamin Beker, Austin, TX (US);
Tom J. Hirsch, Austin, TX (US);
Benjamin Beker, Austin, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A computer power supply system for reducing the AC impedance of a DC power supply () at inputs pins of a computing device () such as a processor. A quarter wavelength transmission line stub () 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.