Design of Optimized Reversible BCD Adder/Subtractor

Abstract—Reversible logic has emerged as one of the most important research area in the past few decades. Reversible or information lossless circuits have applications in nanotechnology, digital signal processing, communication, computer graphics and cryptography. It is also a fundamental requirement in the emerging field of quantum computing. In this paper an optimized method is proposed to realize a reversible Binary Coded Decimal (BCD) adder/subtractor circuit. In order to optimize the design, nines compliment gate (NCG) and BSCL gates are proposed. This proposed reversible BCD adder/subtractor is evaluated and optimized in terms of gate count, constant inputs and garbage outputs.