Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – In combination with or also constituting light responsive...
Reexamination Certificate
2006-10-03
2006-10-03
Andujar, Leonardo (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
In combination with or also constituting light responsive...
Reexamination Certificate
active
07115912
ABSTRACT:
An integrated circuit chip (IC) is equipped with a device for preventing reverse engineering by monitoring light emissions emitted from transistors and such electrically active devices in a circuit located in the IC. The device can be an opaque structure that blocks emissions from being detected external to the IC. Alternatively, the device can reduce light emissions from the transistors to prevent detection of the light emissions external to the IC. The device, in another alternative, can emit extraneous light emissions to hide a pattern of light emissions emitted from the transistors. As a further alternative, the device can add random delay to a signal driving the transistors to randomize the pattern of light emissions emitted from the transistors to prevent detection of a predetermined pattern of light emissions external to the IC.
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Kash Jeffrey A.
Knebel Daniel R.
Tsang James C.
Andujar Leonardo
August Casey P.
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Gutman Jose
International Business Machines - Corporation
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