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VLSI Design
Volume 2009 (2009), Article ID 679853, 7 pages
http://dx.doi.org/10.1155/2009/679853
Research Article

Reduced Voltage Scaling in Clock Distribution Networks

Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX 78249, USA

Received 28 April 2009; Accepted 18 December 2009

Academic Editor: Xianlong Long Hong

Copyright © 2009 Khader Mohammad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a novel circuit technique to generate a reduced voltage swing (RVS) signals for active power reduction on main buses and clocks. This is achieved without performance degradation, without extra power supply requirement, and with minimum area overhead. The technique stops the discharge path on the net that is swinging low at a certain voltage value. It reduces active power on the target net by as much as 33% compared to traditional full swing signaling. The logic 0 voltage value is programmable through control bits. If desired, the reduced-swing mode can also be disabled. The approach assumes that the logic 0 voltage value is always less than the threshold voltage of the nMOS receivers, which eliminate the need of the low to high voltage translation. The reduced noise margin and the increased leakage on the receiver transistors using this approach have been addressed through the selective usage of multithreshold voltage (MTV) devices and the programmability of the low voltage value.