Design of 4-Bit Ripple Carry Adder Using Modified-GDI Technique

This paper present a new design technique, Modified Gate Diffusion Input (M-GDI) based on basic GDI cell. M-GDI technique is much more power efficient than existing GDI cell. This technique is used for design of fast, low power circuits, using reduced number of transistors, while improving power characteristics. In this paper a 4-Bit Ripple Carry Adder has been designed using M-GDI logic which reduces the number of transistor count significantly, while maintaining low complexity of design. The performance characteristics of M-GDI Ripple Carry Adder are compared with GDI and traditional CMOS logic. The simulation of the proposed design has been carried out in LT spice tool using 50nm technology.