Power Supply Voltage Dependence of Within-Die Delay Variation of Regular Manual Layout and Irregular Place-and-Route Layout

Tadashi YASUFUKU  Yasumi NAKAMURA  Zhe PIAO  Makoto TAKAMIYA  Takayasu SAKURAI  

IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.6   pp.1072-1075
Publication Date: 2011/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1072
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
within-die delay variation,  design methodology,  low voltage,  

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Dependence of within-die delay variations on power supply voltage (VDD) is measured down to 0.4 V. The VDD dependence of the within-die delay variation of manual layout and irregular auto place and route (P&R) layout are compared for the first time. The measured relative delay (=sigma/average) variation difference between the manual layout and the P&R layout decreases from 1.56% to 0.07% with reducing VDD from 1.2 V to 0.4 V, because the random delay variations due to the random transistor variations dominate total delay variations instead of the delay variations due to interconnect length variations at low VDD.