A Novel Hybrid Full Adder Based on Gate Diffusion Input Technique, Transmission Gate and Static CMOS Logic

This research proposes a hybrid Full Adder (FA) cell using a combination of Gate Diffusion Input (GDI) technique, Transmission Gate (TG) and conventional Static CMOS (C-CMOS) logic. To test performance parameters, simulation has been conducted using Cadence Virtuoso in 65 nm technology. Moreover, a comparative analysis of the proposed design with 13 existing state of art FAs has been presented in this research to observe the performance improvements obtained by the proposed FA. In addition, the proposed and existing FAs have been cascaded to implement 4-bit, 8-bit, 16-bit and 32-bit adder to test their performance and feasibility in large structures. The proposed design exhibited remarkable performance both as single cell and cascaded mode. Besides, the proposed technique for FA design removes the defect of voltage degradation in GDI technique and low drivability of TG based design by utilizing C-CMOS logic in the output terminals.