Design of an Energy Efficient 4-2 Compressor

Abstract

In this paper an energy efficient 4-2 compressor is designed by utilizing only 36 transistors. The architecture of this new compressor consists of 8 transistors (8T) Exclusive-OR-Exclusive-NOR (XOR-XNOR) module and multiplexer based on transmission gate logic. The 8T XOR-XNOR module not only offers high speed, full voltage swing at outputs but also consumes less power. Simulations are done by using Cadence Virtuoso Tool in 180nm CMOS technology. The performance parameters, viz. maximum output delay, average power dissipation and power-delay-product (PDP) are varied from 920.1ps to 211.4ps, 11.85µW to 123.4µW and 10.90fJ to 26.09fJ respectively with a variation of supply voltage from 1V to 3V. Further a comparison of the performance parameters of the proposed compressor is performed with a number of the existing 4-2 compressors at 1.8V supply. Simulation results depict that the proposed compressor attains improvement in terms of speed, power and PDP.