作者crazying (追殺大象)
看板NTUGIEE_EDA
標題Re: [研究] review 大象睡了沒?
時間Sun Jun 5 11:17:03 2005
※ 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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