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Title: Power Distribution Network Optimization for Timing Improvement with Statistical Noise Model and Timing Analysis
Authors: ENAMI, Takashi
SATO, Takashi  kyouindb  KAKEN_id  orcid (unconfirmed)
HASHIMOTO, Masanori  kyouindb  KAKEN_id
Author's alias: 佐藤, 高史
Keywords: power distribution network
decoupling capacitance
timing analysis
statistical static timing analysis
decap insertion
wire sizing
Issue Date: Dec-2012
Publisher: The Institute of Electronics, Information and Communication Engineers
Journal title: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Volume: E95.A
Issue: 12
Start page: 2261
End page: 2271
Abstract: We propose an optimization method for power distribution network that explicitly deals with timing. We have found and focused on the facts that decoupling capacitance (decap) does not necessarily improve gate delay depending on the switching timing within a cycle and that power wire expansion may locally degrade the voltage. To resolve the above facts, we devised an efficient sensitivity calculation of timing to decap size and power wire width for guiding optimization. The proposed method, which is based on statistical noise modeling and timing analysis, accelerates sensitivity calculation with an approximation and adjoint sensitivity analysis. Experimental results show that decap allocation based on the sensitivity analysis efficiently minimizes the worst-case circuit delay within a given decap budget. Compared to the maximum decap placement, the delay improvement due to decap increases by 3.13% even while the total amount of decaps is reduced to 40%. The wire sizing with the proposed method also efficiently reduces required wire resource necessary to attain the same circuit delay by 11.5%.
Rights: © 2012 The Institute of Electronics, Information and Communication Engineers
DOI(Published Version): 10.1587/transfun.E95.A.2261
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