Comparative Study of CMOS Logic and Modified GDI Technique for Basic Logic Gates and Code Convertor

Abstract

For designing low power digital circuits with better reliability and performance along with less propagation delay, Gate Diffusion Input (GDI) is one such technique. It also significantly reduces the area and delay of a circuit. It is a low power technique which requires a smaller number of transistors to achieve desired outputs with lower design complexity as compared to CMOS logic or Pass Transistor Logic. In a basic GDI cell, 3 terminals namely Gate, Source and Drain are treated as inputs. In this work, circuits like logic gates, and Binary to Gray code convertor have been designed using CMOS logic and a Modified GDI technique. Also, the power dissipation of all these circuits have been calculated and compared for CMOS and Modified GDI. The designing and simulations have been done on Cadence Virtuoso tool in 90 nm technology and power supply voltage has been taken as 1 V.