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Icircuit pc version subcircuit7/17/2023 ![]() The magnitude and phase angle of Z-1 are given by (2). In the small signal AC frequency domain an ideal delay is represented by (1). II.ğundamental properties of sampled delayĪ key component in the simulation of sampled data systems is a delay element with a delay of one sampled data period. The text stresses those model features which are not found in SPICE 2g6 or 3f5 and outlines how sampled data system models can be developed which are suitable for use with any general purpose circuit simulator that allows subcircuits with parameters or compiled Verilog-A hardware description language models. The proposed models have been implemented and tested as equation defined device subcircuits and compact Verilog-A macromodels using the Qucs (Quite universal circuit simulator) GPL software. Nabijou, is with the Faculty of Computing, London Metropolitan University, London, UK.(e-mail: received October XX, 2009Ī number of fundamental functional subcircuit and Verilog-A delay models. He is a member of the Qucs development team. Brinson is with the Faculty of Computing, London Metropolitan University, London, UK. Ideally, such sampled data component models should also be optimized for minimum memory usage. ![]() Hence, accurate and computationally efficient signal delay, signal summing and signal multiplication models are required for use with general purpose circuit simulators. 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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