Articles | Volume 2
https://doi.org/10.5194/ars-2-227-2004
https://doi.org/10.5194/ars-2-227-2004
27 May 2005
27 May 2005

Theory of circuit block switch-off

S. Henzler, J. Berthold, G. Georgakos, and D. Schmitt-Landsiedel

Abstract. Switching-off unused circuit blocks is a promising approach to supress static leakage currents in ultra deep sub-micron CMOS digital systems. Basic performance parameters of Circuit Block Switch-Off (CBSO) schemes are defined and their dependence on basic circuit parameters is estimated. Therefore the design trade-off between strong leakage suppression in idle mode and adequate dynamic performance in active mode can be supported by simple analytic investigations. Additionally, a guideline for the estimation of the minimum time for which a block deactivation is useful is derived.