We consider the problem of minimizing the delay in transporting a signal across a distance in a VLSI circuit.The problem can be restated as a combined buffer insertion, buffer sizing and wire sizing problem. We propose a simple buffering architecture for this problem and show that this architecture achieves a near optimal solution. We also derive simple models for a buffered wire which are suitable for high level design.

Molecular-dynamics simulations of a model dipolar system containing two ions have been carried out to study the effect of temperature on the time-dependent friction (((t)) on the solute ions as well as the electric fields in the vicinity of the ions. It is found that with an increase in temperature, (/) the magnitude of ((0) increases and (ii) the electric field time correlation functions decay more rapidly at higher temperatures due to faster reorientations and translational diffusion of the molecules. The effects of the size of the system on these properties have also been investigated.Keywards. Molecular-dynamics simulations; dipolar solvent; time-dependent friction; electric field fluctuations; size effects.

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