Performance Analysis of Accurate and Approximate Compressors at Nanometer Regime

In digital signal processing, mainly in image and video processing, approximate devices have acquired a unique place. Approximate computing is an alluring creation that brought a revolution in terms of minimizing essential parameters like power, delay, and area to improve performance. Whereas beyond CMOS devices enhanced this whole work to the next level leveraging them to perform approximate computing. In this paper different research made on approximate compressors is discussed, accompanied by its working, and the use of spin devices to make computation devices is also discussed. The use of beyond CMOS devices brought a lot of improvement in compressors in terms of speed and accuracy. The error rate for spin-based devices is less as research is done forward in time, for some of the work on 4-2 compressors it turns out to be approximately 0.25%.