Reversible Logic based Kogge -Stone Adder: Implementation and Analysis

There is an increasing demand for the need for efficient, low-power arithmetic circuits becomes increasingly critical. The Kogge Stone Adder (KSA) is widely recognized for its fast parallel prefix operation, making it a suitable candidate for high-performance addition in classical computing. However, the introduction of reversible logic gates offers new opportunities to further optimize its design, particularly for quantum computing applications where energy dissipation and reversibility are key considerations. This paper presents an implementation of a Kogge Stone Adder (RKSA) using reversible gates. By employing reversible logic gates such as Toffoli Fredkin gates Pears and HNG., the proposed design minimizes heat generation and energy loss, aligning with the fundamental requirements of quantum systems. We analyze the proposed RKSA in terms of area, power dissipation, delay, quantum cost, gate count, energy efficiency, comparing its performance to classical KSA designs as well as other reversible adders. Simulation is carried out in Cadence genus tool using 90nm technology file depicting a reduction in power by 4.3% and 25% reduced datapath delay with a small overhead in area by 19% compared to conventional implementation.