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:
Aug. 15, 2000
Filed:
Sep. 17, 1998
Leon L Wu, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Memory chips (15) are mounted perpendicularly on a memory module substrate (14) to achieve a close spacing between the chips. A plurality of memory chip signal lines (20) are located on the memory module substrate (14) and the memory chips (15) are electrically coupled to the memory chip signal lines at spaced apart chip coupling points (23). Digital signals are driven to the memory chip signal lines (20) through signal lines (21) having a first level impedance. The memory chip signal lines (20) have a second level impedance greater that the first level impedance. The spacing between the chip coupling points (23) is chosen such that the effective impedance level of the memory chip signal lines (20) substantially matches the lower, first level impedance.