Spin Wave Based Approximate 4:2 Compressor

TL;DR

This paper introduces an energy-efficient spin wave based approximate 4:2 compressor that outperforms CMOS and Spin-CMOS counterparts in energy consumption, delay, and chip area, validated through micromagnetic simulations.

Contribution

It presents a novel spin wave based approximate 4:2 compressor with improved energy efficiency and lower delay, validated by simulations and comparative analysis.

Findings

Consumes 31.5% less energy than accurate spin wave design

Exhibits 3x lower delay compared to similar spin wave approximate compressor with DC

Uses 14% less energy and has 17% lower error rate than 45nm CMOS counterpart

Abstract

In this paper, we propose an energy efficient SW based approximate 4:2 compressor comprising a 3-input and a 5-input Majority gate. We validate our proposal by means of micromagnetic simulations, and assess and compare its performance with one of the state-of-the-art SW, 45nm CMOS, and Spin-CMOS counterparts. The evaluation results indicate that the proposed compressor consumes 31.5\% less energy in comparison with its accurate SW design version. Furthermore, it has the same energy consumption and error rate as the approximate compressor with Directional Coupler (DC), but it exhibits 3x lower delay. In addition, it consumes 14% less energy, while having 17% lower average error rate than the approximate 45nm CMOS counterpart. When compared with the other emerging technologies, the proposed compressor outperforms approximate Spin-CMOS based compressor by 3 orders of magnitude in term of energy consumption while providing the same error rate. Finally, the proposed compressor requires the smallest chip real-estate measured in terms of devices.