CMOS transistor sizing for minimization of energy-delay product

In this paper, we revisit three of the well known optimization results in CMOS transistor sizing with the energy-delay product as a new metric. We study the absolute sizes of and the ratio between n-channel and p-channel transistor widths in uniform logic, the optimal distance between repeaters in an RC line, and the optimum number of inverter stages, along with their sizes, needed to drive a large load capacitance. Results, both theoretical and numerical, show that in general the optimum solutions for energy-delay lead to smaller designs than the ones obtained for minimum delay.