Simulation and optimization of the power distribution network in VLSI circuits
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...Manually generated “hot loops,” an extensive set of input vectors and statically generated worst-case current profiles [ 6 ], [10]‐[13] are some of the alternatives that address the worst-case coverage issue....
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Cites background from "Simulation and optimization of the ..."
...In the past, decap optimization has been investigated at circuit level or system level [11], [12] with the assumption that there is always white (empty) space available for decap....
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"Simulation and optimization of the ..." refers methods in this paper
...Use of average currents or current values obtained by simulation [1, 2, 3, 4 , 5, 6] for a small number of input vectors is not guaranteed to give the worst-case voltage drop....
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...Simulation based methods that are used to estimate the macro-block current waveforms [1, 2, 3, 4 , 5, 6] and techniques that implicitly search the exponential search space for maximum current [8, 9] can only generate a lower bound estimate of the maximum current envelope given nite computational resources....
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...All existing techniques [1, 2, 3, 4 , 5, 6] and the proposed technique use the hierarchical abstraction with minor variations....
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...Since we use the MCE, the IR drop solution would be an upper-bound and is an improvement over the techniques proposed in [1, 2, 3, 4 ]....
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...The power-bus analysis techniques [1, 2, 3, 4 ], compute the IR drop at nodes in the power distribution network by using the macro-block currents as a DC current obtained heuristically, or a DC current obtained by logic simulations for a few vectors or a transient current waveform obtained by simulations for a few vectors....
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