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

Koichi HAMAMOTO  Hiroshi FUKETA  Masanori HASHIMOTO  Yukio MITSUYAMA  Takao ONOYE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.2   pp.281-285
Publication Date: 2009/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.281
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Integrated Electronics
Keyword: 
body bias,  layout,  

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Summary: 
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 90 nm 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.