Reversible Logics are very important and useful for the future computational technologies. Reversible Logic is an important Research Area which is using for CMOS design with Low Power. In this paper, we give the Chronically Review for the Fault Tolerance Full Adder/ Subtractor. We are also showing the logical circuit for the Fault Tolerance Adder/ Subtractor.
Keywords- COG, delay Reversible gate ,Feynman double gate, Fredkin gate, full adder, MIG.