Design of 16T full adder circuit using 6TXNOR gates

摘要

Adders are most useful circuits for processor and microcontroller designs such as multipliers, shifters and other complex VLSI applications. This paper proposes design of 16T-one bit full adder circuit comprising of XNOR gates, pass transistors and transmission gate logic. The design includes two 6T XNOR gates and one 2:1 MUX. Functionality of the design is faithfully verified using Cadence Virtuoso Simulation tool using GPDK 180nm technology. The W/L ratio of 2μm/180nm is considered for all the transistors. The performance of 16T single bit Full Adder has been investigated and evaluated by the simulation results obtained from the improved design of XNOR gate and has resulted in improvement of power dissipation and output voltage.