Use ofsilicon block process step to camouflage a false transistor 3-1 OPTICS - PATENTS 28/02/07 22:27:38 PAGE 26 UMBER: 6148 21 MARCH 2007 cations For Patents

摘要

The similarity of non-operable and operable transistors in an integrated circuit is increased by ensuring that the distance between the gate and source or drain electrodes is the same for both types of transistor. The use of non-operable transistors allow the circuit designer to disguise an AND gate so that it appears to be an OR gate to the reverse engineer. The disguised non-operable transistors cause the circuitry to operate in an unexpected manner to the reverse engineer.