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 1,2,3) 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 (at some expense for small circuits.
