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Diffstat (limited to 'cad/acs/pkg-descr')
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diff --git a/cad/acs/pkg-descr b/cad/acs/pkg-descr deleted file mode 100644 index efc0bfdaf161..000000000000 --- a/cad/acs/pkg-descr +++ /dev/null @@ -1,48 +0,0 @@ -ACS is a general purpose circuit simulator. It performs nonlinear -dc and transient analyses, fourier analysis, and ac analysis -linearized at an operating point. It is fully interactive and -command driven. It can also be run in batch mode or as a server. -The output is produced as it simulates. Spice compatible models -for the MOSFET (level 1 and 2) and diode are included in this -release. - -Since it is fully interactive, it is possible to make changes and -re-simulate quickly. The interactive design makes it well suited -to the typical iterative design process used it optimizing a circuit -design. It is also well suited to undergraduate teaching where -Spice in batch mode can be quite intimidating. This version, while -still officially in beta test, should be stable enough for basic -undergraduate teaching and courses in MOS design, but not for -bipolar design. - -In batch mode it is mostly Spice compatible, so it is often possible -to use the same file for both ACS and Spice. - -The analog simulation is based on traditional nodal analysis with -iteration by Newton's method and LU decomposition. An event queue -and incremental matrix update speed up the solution for large -circuits. - -It also has digital devices for mixed signal simulation. The -digital devices may be implemented as either analog subcircuits or -as true digital models. The simulator will automatically determine -which to use. Networks of digital devices are simulated as digital, -with no conversions to analog between gates. This results in -digital circuits being simulated faster than on a typical analog -simulator, even with behavioral models. The digital mode is -experimental and needs work. There will be substantial improvements -in future releases. - -ACS also has a simple behavioral modeling language that allows -simple behavioral descriptions of most components including capacitors -and inductors. Unfortunately, it is not well documented. - -ACS uses an object oriented approach to modeling. Complex models -like MOSFETS are made of simpler ones like resistors, capacitors, -diodes, and any other models that may already exist. The model -designer does not need to worry about details like convergence -checking, bypass checking, integration, or how the new device plugs -into the solution matrix because these are already taken care of -by the basic models. This results in a dramatic improvement in -the time it takes a researcher or model designer to install a new -model, compared to Spice. |