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. 04, 2003
Filed:
Oct. 12, 2000
Hideki Sasaki, Tokyo, JP;
Shuichi Oe, Tokyo, JP;
Shunji Sato, Tokyo, JP;
Takahiko Kikukawa, Tokyo, JP;
Hideaki Kobayashi, Tokyo, JP;
Takashi Harada, Tokyo, JP;
Yuki Takahashi, Miyagi, JP;
NEC Corporation, Tokyo, JP;
Abstract
Printed circuit board on which LSI is mounted comprises first capacitors and for electrically connecting power source terminals and to via holes , first power source wiring , second power source wiring and a second capacitor . In a predetermined frequency range, the characteristic impedances in power source wirings and are set to three times or more higher than the impedances in capacitors and . In addition, the lengths of power source wirings and are set to equal to or larger than a value obtained by multiplying 20 mm by the wavelength reduction rate of the printed circuit board and equal to or smaller than a value obtained by multiplying one quarter the wavelength at the upper limit frequency in the predetermined frequency range by the wavelength reduction rate.