EP 0931344 A1 19990728 - SYSTEM FOR PROTECTING SEMICONDUCTOR CHIPS AGAINST ANALYSIS
Title (en)
SYSTEM FOR PROTECTING SEMICONDUCTOR CHIPS AGAINST ANALYSIS
Title (de)
ANALYSIERSCHUTZ FÜR EINEN HALBLEITERCHIP
Title (fr)
SYSTEME DE PROTECTION D'ANALYSE POUR PUCE A SEMI-CONDUCTEUR
Publication
Application
Priority
- DE 9702039 W 19970911
- DE 19639033 A 19960923
Abstract (en)
[origin: DE19639033C1] The invention concerns a system for protecting a semiconductor chip (1) with a covering (4) against copying, the system comprising an oscillating circuit which is capable of resonance and whose elements are located on the chip surface (3) and inside the covering (4), and an evaluation circuit connected thereto. The circuit deactivates the semiconductor chip when the oscillating circuit is brought out of resonance. This off-resonance adjustment of the oscillating circuit occurs when the covering (4), which acts as a dielectric of the capacitor, is removed. It is impossible to operate the semiconductor chip (1) for copying or analysis purposes once its covering (4) has been removed.
IPC 1-7
IPC 8 full level
G06F 1/00 (2006.01); G06F 21/86 (2013.01); H01L 23/58 (2006.01)
CPC (source: EP US)
G06F 21/86 (2013.01 - EP US); H01L 23/576 (2013.01 - EP US); H01L 2924/0002 (2013.01 - EP US); Y10S 257/922 (2013.01 - EP US)
C-Set (source: EP US)
Citation (search report)
See references of WO 9813872A1
Designated contracting state (EPC)
AT CH DE FR GB LI
DOCDB simple family (publication)
DE 19639033 C1 19970807; EP 0931344 A1 19990728; IN 191646 B 20031213; US 6201296 B1 20010313; WO 9813872 A1 19980402
DOCDB simple family (application)
DE 19639033 A 19960923; DE 9702039 W 19970911; EP 97943756 A 19970911; IN 1703CA1997 A 19970916; US 27450199 A 19990323