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Piecewise approximate circuit simulation

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2 Author(s)
Visweswariah, C. ; Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Rohrer, R.A.

A simulation methodology for the nonlinear transient analysis of electrical circuits is described. Equations are formulated on the tree/link basis. All branch and node variables are modeling to be piecewise approximate in time. Electronic devices are represented by empirical table models of I-V characteristics. The table models may be built at various levels of precision, and concomitant accuracy levels are reflected in the simulation results. Simulation accuracy may be varied on a branch-by-branch basis or global basis, this permitting the user to distribute computer resources in a meaningful manner. The simulation algorithm is event driven and fully exploits temporal sparsity in the underlying circuit equations. Mechanisms for dealing with steady-state situations and stiff circuits have been investigated. A prototype simulator, SPECS, has been developed and tested on large industrial integrated circuits. It has proven to be a reliable and efficient tool in the analysis of digital and mixed circuits

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:10 ,  Issue: 7 )