current consumption
I am not sure on which foundry of 0.18um u gonna use... but i guess there are few types of transistor u can use to reduce the AC/DC leakage...
what i meant is those low power or thick oxide type of transistor instead of those general type... normally u need to trade off leakage for performance... for instance, when switching, the AC leakage is the Idsat current... reducing W/L will reduce AC leakage but reduce speed/driving strength...
btw, i guess u are talking about standard cell, i dunno whether it can be modify... haha sorry... I am not really onto standard cell...
sp