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A Near-Threshold Voltage Oriented Digital Cell Library for High-Energy Efficiency and Optimized Performance in 65nm CMOS Process

Authors
Jun, JaehunSong, JaegeunKim, Chulwoo
Issue Date
5월-2018
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
CMOS integrated circuit; near threshold voltage; digital cell library; energy efficiency; EDP; forward body biasing; RSCE; INWE
Citation
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, v.65, no.5, pp.1567 - 1580
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume
65
Number
5
Start Page
1567
End Page
1580
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/75994
DOI
10.1109/TCSI.2017.2758793
ISSN
1549-8328
Abstract
A digital cell library operating in the near-threshold voltage (NTV) region is presented to obtain both high energy efficiency and optimized performance. The proposed library oriented to the NTV region is optimized using the parasitic effects of nanometer process technology and a body-biasing technique. To maximize the energy efficiency, the proposed cell library utilized the minimum width allowed by the process as the base width unit. To enhance the performance, digital cells were developed with various strengths whose sizing method relies on the minimum unit width, reverse short channel effect, and inverse narrow width effect. An asymmetric gate-length scheme is applied to multi-fan-in logic gates to increase the performance. Also, the proposed TAP cell was added, combined with an inverter-based forward body-biasing circuit. Finally, a library with 59 cells was developed and made available for synthesis and automatic layout and the proposed NTV library was then evaluated with ISCAS benchmark logics. The proposed NTV cell library shows more than 10 similar to 20% less energy consumption compared with a conventional digital cell library using minimum gate length and monolithic width. EDP is also increased by 10 similar to 20% with a simply controlled body-biasing scheme compared with the conventional one.
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