Download Advanced Model Order Reduction Techniques in VLSI Design by Sheldon Tan, Lei He PDF

By Sheldon Tan, Lei He

Version order aid (MOR) recommendations lessen the complexity of VLSI designs, paving tips on how to larger working speeds and smaller function sizes. This ebook provides a scientific advent to, and remedy of, the foremost MOR tools hired normally linear circuits, utilizing real-world examples to demonstrate the benefits and downsides of every set of rules. Following a evaluate of conventional projection-based thoughts, assurance progresses to complicated 'state-of-the-art' MOR equipment for VLSI layout, together with HMOR, passive truncated balanced cognizance (TBR) equipment, effective inductance modeling through the VPEC version, and structure-preserving MOR thoughts. the place attainable, numerical tools are approached from the CAD engineer's viewpoint, keeping off advanced arithmetic and permitting the reader to tackle genuine layout difficulties and advance more beneficial instruments. With sensible examples and over a hundred illustrations, this publication is appropriate for researchers and graduate scholars of electric and machine engineering, in addition to practitioners operating within the VLSI layout undefined.

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Error bounds One of the attractive aspects of TBR methods is that computable error bounds are available. If this truncation is such that the resulting Gramians contain the largest k singular values σ1 through σk , then the H∞ norm of the error system has the following upper and lower bound [29, 43]: N ˜ q (s) σk ≤ H(s) − H ∞ ≤2 σk . , of the frequency response): σmax [D + C(jω − A)−1 B]. This result provides rigorous justification for using the reduced-order model to predict behavior and enact control of the full system.

Here is the outline of this algorithm [87]. 2: passive truncated balanced realization 1. Solve Lur’e equations or AREs for Xc and Xo . 2. 1, substituting Xc for Wc and Xo for Wo . 6 Hybrid TBR and combined TBR-Krylov subspace methods A hybrid TBR method was proposed in [87] where the classic TBR method is tried first. If the reduced models are not passive, then the positive-real TBR is tried. The rationale for doing this is that TBR approximates are more accurate for a given order than PR-TBR. Also PR-TBR costs more than TBR in computation.

81) with B = L. As a result, G and C are symmetric and positive semidefinite. 6 Passivity preservation In this subsection, we present some important results regarding the passive preservation in the Krylov subspace projection-based model order reduction. Passivity is an important property of many physical systems. A passive network does not generate energy. If the reduced order model loses its passivity, it may lead to unbounded responses in transient simulation, which means that new energy has been generated in this network.

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