Paper Info
Title
An Energy-Efficient Logic Cell Library Design Methodology with Fine Granularity of Driving Strength for Near- and Sub-Threshold Digital Circuits
Abstract
Commercial multi-threshold standard logic cell libraries are designed for nominal super-threshold circuits. If blindly used at near- and sub-threshold voltages, such libraries exhibit excessively coarse granularity in driving strength, leading to sub-optimal logic synthesis and placement-and-routing results. To tackle this problem, a holistic methodology for designing a near- and sub-threshold standard cell library that has fine driving strength granularity is presented in this paper. Meanwhile, the proposed methodology leverages inverse narrow width effect, reverse short channel effect and forward body biasing to modulate the driving strength at low area overheads. Based on the proposed methodology, we develop a 65nm multi-threshold-voltage, multi-channel-length library and benchmark it against the commercial library across several common circuits. The results show a 26.6% reduction in power-delay product, a 28.1% reduction in energy-delay product, and a 27.0% reduction in leakage power at 5.8% area overhead on average, confirming the efficiency of the methodology in near- and sub-threshold digital circuits design.
Year
DOI
Venue
2021
10.1109/ISCAS51556.2021.9401508
2021 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)
Keywords
DocType
ISSN
Fine granularity, driving strength, standard cell library, design methodology, ultra-low voltage
Conference
0271-4302
Citations 
PageRank 
References 
0
0.34
0
Authors
4
Name
Order
Citations
PageRank
Hao Zhang101.69
Weifeng He26114.69
Yanan Sun322.76
Mingoo Seok4116.77