Experimental study on body-biasing layout style-- negligible area overhead enables sufficient speed controllability --

Authors:
Koichi Hamamoto;Hiroshi Fuketa;Masanori Hashimoto;Yukio Mitsuyama;Takao Onoye
Affiliations:
Osaka University, Suita, Osaka, Japan;Osaka University, Suita, Osaka, Japan;Osaka University, Suita, Osaka, Japan;Osaka University, Suita, Osaka, Japan;Osaka University, Suita, Osaka, Japan
Venue:
Proceedings of the 18th ACM Great Lakes symposium on VLSI
Year:
2008

Citing 4
Cited 0

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Abstract

Body-biasing is expected to be a common design technique, then area efficient implementation in layout has been demanded. Body-biasing outside standard cells is one of possible layouts. However in this case body-bias controllability, especially when forward bias is applied, is a concern. To investigate the controllability, we fabricated a ring oscillator in a 90nm technology, and measured the controllability. Our measurement result and evaluation of area efficiency reveal that body-biased circuits can be implemented with area overhead of less than 1% yet with sufficient speed controllability.