An Experimental Study on Body-Biasing Layout Style Focusing on Area Efficiency and Speed Controllability

Regular Section

Koichi HAMAMOTO, Hiroshi FUKETA, JST CREST">Masanori HASHIMOTO, JST CREST">Yukio MITSUYAMA, JST CREST">Takao ONOYE

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Keywords: body bias, layout

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2009 Volume E92.C Issue 2 Pages 281-285

DOI https://doi.org/10.1587/transele.E92.C.281

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Abstract

Body-biasing is expected to be a common design technique, and 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 and measured a ring oscillator in a 90nm technology. 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.

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