Integrated circuit identification system
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United States of America Patent
Stats
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May 8, 2001
Grant Date -
N/A
app pub date -
Jan 2, 1998
filing date -
Jan 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved integrated circuit including decryption functions employs a method for determining if its environment has been modified, by providing a first VCXO as part of the integrated circuit, providing a second VCXO, adjusting one of the VCXOs in a first preselected manner, determining a first frequency count of the adjusted VCXO during a first preselected time interval using the other VCXO, adjusting the one of the VCXOs in a second preselected manner, determining a second frequency count of the adjusted VCXO during the first preselected time interval using the other VCXO, averaging the first and second frequency count to provide an average frequency count, adjusting the average frequency count in a predetermined manner, and comparing the adjusted average frequency count to a previously stored, determined, or provided average frequency count to determine if the environment of the integrated circuit has been modified.
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