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:
Nov. 06, 2007
Filed:
Feb. 28, 2005
Siva Raghuram, Germering, DE;
Siva RaghuRam, Germering, DE;
Infineon Technologies, AG, Neubiberg, DE;
Abstract
A chip stack employing BGA or FBGA integrated circuit chip packages is provided. Two chip packages have bottom surfaces attached with sets of electrical contacts, which are oriented towards each other and are electrically connected to conductive patterns formed within the same flex substrate. One set contacts a conductive pattern on a top surface, the other set contacts a pattern on a bottom surface of the flex substrate within a same end portion. The other end portion has a conductive pattern, and is connected to a third set of electrical contacts. The flex substrate is wrapped around an edge of the chip package to connect the third set with the other two sets. Thereby, four chip packages are provided with this design, the layout of conductive traces formed within at least one of the flex substrates is meandered to compensate for length differences with respect to the other flex substrate.