An On-Chip Supply-Voltage Control System Considering PVT Variations for Worst-Caseless Lower Voltage SoC Design

Takayuki GYOHTEN  Fukashi MORISHITA  Isamu HAYASHI  Mako OKAMOTO  Hideyuki NODA  Katsumi DOSAKA  Kazutami ARIMOTO  Yasutaka HORIBA  

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.11    pp.1519-1525
Publication Date: 2006/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.11.1519
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Novel Device Architectures and System Integration Technologies)
PVT variation,  temperature detection,  series regulator,  

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Adaptive voltage management (AVM) scheme is proposed for worst-caseless lower voltage SoC design. The AVM scheme detects the temperature accurately by using two oscillators with different temperature characteristics, and sets supply voltage most suitable with a table look-up method corresponding to the process variation. Also, the AVM can supply the stable voltage with a local shift type regulator even at lower voltage. Thereby, this supply-voltage control system considering PVT variations can control the internal voltage corresponding to process and temperature variations and can realize a wide-operating-margin, DFM function for low voltage SoC. The experimental chip is fabricated on a 90 nm CMOS process, and it was confirmed that the proposed architecture controls the voltage accurately and has a wide operating margin at a lower voltage.