Comparative Analysis: Power Reversible Comparator Circuits 90 Nm Technology

In this paper we design GDI and TG based Reversible Comparator circuit using 90 nm Technology. Reversible or information loss less circuits have applications in nanotechnology, digital signal processing, communication, computer graphics and cryptography. They are also a fundamental requirement in the emerging field of quantum computing. Reversible gates are evaluated in terms of number of transistor count, critical path, garbage outputs and one to one mapping. Here transistor implementation of the reversible gates is done by using a combination CMOS-GDI circuit, TG Circuits, which provides the optimal solution for combinational logic, saving 1/3 the power, half the area and 10% in delay relative to a CMOS implementation. GDI circuits provide some measure of enhanced hazard tolerance and are more suitable for low voltage operation. Here transistor implementation of reversible gates is done by using Tanner tools and H-spice tools. Since the proposed work is explored for the first time ever in literature, the contribution of this paper will create a new thread of research in the area of reversible logic circuit.