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Analog functional simulator for multilevel systems

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4 Author(s)
Genhong Ruan ; Analogy Inc., Beaverton, OR, USA ; Vlach, Jiri ; Barby, J.A. ; Opal, A.

The authors describe a high-level functional analog simulator for hybrid logic/analog networks. it forms one level of an experimental multilevel simulation system which is currently under development. The functional simulator is described in detail, and the structure of the multilevel simulator is briefly outlined. It can be used as a stand-alone system but was developed specifically for coupling with other levels of simulation which also use time responses (or voltage waveforms). Since Boolean algebra cannot operate with time responses, a new algebra is developed. It eliminates the unknown state, the main obstacle in coupling analog simulation to logic simulation. Logic states are replaced by operations on time functions, in this case represented by piecewise linear segments. High-level analog operations are also possible. The simulator based on these ideas was used to solve several high-level analog problems. The examples presented demonstrate its application

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:10 ,  Issue: 5 )