Moreover, amongst the current general purpose simulators it is not common for packages to include dedicated simulation engines for sampled data system analysis and testing. Designers are faced with the need to simulate multi-domain systems which include an ever increasing range of electrical and nonelectrical technologies. In terms of sampled data technologies mixed-mode simulation is much more than simply the combination of analog and digital analysis software. Today, most circuit simulators include a digital simulator that operates synchronously with an analog analysis engine, allowing the analysis and testing of complex mixed-mode circuit designs. Early simulators, and indeed some more recent releases of commercial and GNU Public License (GPL) open source packages, were primarily analog circuit analysis tools with polynomial sources (SPICE 2g6 ) and non-linear controlled sources (SPICE 3f5 ) modeling non-linear components at a functional level. IN modern circuit design the term mixed-mode simulation has become synonymous with the analysis and design of integrated analog and digital electronic systems. Index Terms-Mixed-mode sampled data circuit simulation Functional delay subcircuits Compact Verilog-A delay macromodels Qucs (Quite universal circuit simulator) Each of these stresses the use of test and data extraction techniques which are not easily undertaken with the SPICE 2g6 or 3f5 simulators. ![]() To illustrate the properties of the proposed macromodels a number of Qucs (Quite universal circuit simulator) transient and frequency domain simulation examples are presented. This paper describes a number of functional, computationally efficient, Z domain delay models, outlining the role of current and charge equations in the construction of subcircuit and compact Verilog-A delay macromodels. Nabijou, Member, IEEEĪbstract-Mixed-mode simulation is an important circuit design and system testing tool for established and emerging semiconductor sampled data technologies. Z Domain Delay Subcircuits and Compact Verilog-A Macromodels for Mixed-mode Sampled
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