Body bias control for a coarse grained reconfigurable accelerator implemented with Silicon on Thin BOX technology

Honlian Su, Yu Fujita, Hideharu Amano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

Abstract

For low power yet high performance processing in battery driven devices, a coarse grained reconfigurable accelerator called Cool Mega Array (CMA)-SOTB is implemented by using Silicon on Thin BOX (SOTB), a new process technology developed by the Low-power Electronics Association & Project (LEAP). A real chip using a 65nm experimental process achieved a sustained performance of 192MOPS with a power supply of 0.4V and power consumption of 1.7mW. A clock frequency of 89MHz was achieved with a power supply of just 0.4V when a forward bias voltage was given. When using a reverse bias, the leakage current could be suppressed to less than 20μW in the stand-by mode. The key concept of CMA-SOTB is maintaining a balance between performance and leakage current by independently controlling the bias voltages of the PE array and the microcontroller. Evaluations of the operational frequency and power consumption of filter application programs shed light on how to find the combination of bias voltages that achieves the best energy efficiency for a required performance. The range of advantageous power supply voltage for a required performance considering the body bias was also found.

Original languageEnglish
Title of host publicationConference Digest - 24th International Conference on Field Programmable Logic and Applications, FPL 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9783000446450
DOIs
Publication statusPublished - 2014 Oct 16
Event24th International Conference on Field Programmable Logic and Applications, FPL 2014 - Munich, Germany
Duration: 2014 Sep 12014 Sep 5

Publication series

NameConference Digest - 24th International Conference on Field Programmable Logic and Applications, FPL 2014

Other

Other24th International Conference on Field Programmable Logic and Applications, FPL 2014
CountryGermany
CityMunich
Period14/9/114/9/5

ASJC Scopus subject areas

  • Computer Science Applications
  • Hardware and Architecture

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