※ 引述《moonshade (搬家貓)》之銘言： : paper ID: 286 : The authors present an algorithm to minimize the mean and variance of leakage : power under statistical timing constraints by sizing gate length and gate lengths : width and selecting vt, which are modeled by biased normal random variables. widths vts : The problem is solved using a existed nonlinear programming package. They an : derived the formulas for calculating expectation and variance of whole chip : leakage power. Assume that the delay of each cell is i.i.d normal random Assuming : variable and the variance is proportion to the mean, they use an expectation : formula to estimate the probability of satisfying the timing constraints. The ^^?? : experiment is performed on a simple NAND circuit. : 1. The contribution of this paper is taking the effective channel length : (Leff) in to consideration and showing the significance of combining into : Leff sizing. : 2. In 4.2 delay model, the authors assume the delay is normal distributed ^^^^^^^^^^^^^^^^^^?? distributed : to simplify the problem, but in fact, the normal distributed variables : and the expectation equation 15 show that the delay is not normal. distributed : Therefore the probability estimation is incorrect (Equation 14). : The assumption of the variance is proportion to the mean of the delay : of a gate is also far-fetched. Figure 3 only shows that the mean of : delay calculation is accurate. It does not show any information about : the fidelity of assumption of the delay or the variance. : 3. In the reviewers' opinion, there number of available vt is not that ^^^^^?? vts : many as in this paper. The low-k process provides only two selections : of vt. : 4. The circuit for experiment is too simple and no runtime is reported. the : The reviewers suggest that the authors should test the algorithm on : more complicated circuits to show the robustness and efficiency of : the algorithm. : 5. There are some unmatched parenthesis, for example, the "N(0, : sigma^2(Vt0))" between Equation (5) and (6). --

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