Digital circuit with transistor geometry and channel stops provi

Details Digital circuit with transistor geometry and channel stops provi Digital circuit with transistor geometry and channel stops provi

1995-09-22

1998-07-21

Crane, Sara W.

Active solid-state devices (e.g., transistors, solid-state diode

Gate arrays

Having specific type of active device

257390, 257403, H01L 2710

Patent

active

057838461

ABSTRACT:
An integrated digital circuit is protected from reverse engineering by fabricating all transistors of like conductivity with a common size and geometric layout, providing a common layout for different logic cells, connecting doped circuit elements of like conductivity with electrically conductive doped implants in the substrate rather than metalized interconnections, and providing non-functional apparent interconnections that are interrupted by non-discernable channel stops so that all cells falsely appear to have a common interconnection scheme. The camouflage is enhanced by providing a uniform pattern of metal leads over the transistor array, with a uniform pattern of heavily doped implant taps from the transistors for connection to the leads; undesired tap-lead connections are blocked by channel stops.

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