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. 18, 2009
Filed:
Jul. 05, 2004
Ernst Bretschneider, Erfurt, DE;
Ernst Bretschneider, Erfurt, DE;
NXP B.V., Eindhoven, NL;
Abstract
To provide a security-sensitive semiconductor product, particularly a smartcard chip, in which are produced not only electrically active structures () envisaged by the chip design in the form of circuit functions in and on a wafer (), which may for example be composed of silicon, but also additional, electrically conductive parts () (tiles) of the filling structure, which are insulated from one another, are generated by means of a design program in the remaining residual areas, which greatly impedes, to the reverse engineer the analysis of the security-sensitive circuit structure situated beneath them. The contacts between the parts which are generated, which contacts are for interlinking the latter with the chance signal paths described, may be set 'by hand' or by a combination of the design programs in question and a corresponding routing program. The filling conductive parts can also be connected to circuit components, such as transistors, diodes, resistors or capacitors, in order to provide additional circuit functions (e.g. analyzer circuits).