6.7 Methods of Counteracting Microcircuit Re-engineering Processes
621
OUT
PMOS ON NMOS OFF PMOS OFF NMOS
ON
Fig. 6.93 Topology fragment including logic elements—inverter, NAND gate, NOR gate, with
stuck-open p-MOSFETs and stuck-closed n-MOSFETs
Fig. 6.94 View of the screen of the SPICE program with the image of the circuit restored as a result
of analyzing a topology fragment in Fig. 6.93, and the real circuit: circuit obtained from recovery
of a topology fragment (a); actual circuit (b)