For control circuits and random logic

signal complexity evaluated by information entropy (or informational energy) had been calculated to estimate the power consumption of circuits in the past research in the high-level abstract step of VLSI design flow.This paper improved the estimation accuracy for power and area costs of combinational circuits at the behavioral design level

with transition information entropy.Lots of experiments had been implemented to prove the improved estimation accuracy compared to the traditional analytic method.The experimental results with BENCHMARK circuits show that relative errors of area and power estimation have been reduced 24.3% (12.74% to 9.65%) and 15.4% (13.67% to 11.57%).