SAPWIN is an integrated
package of schematic capture, symbolic analysis and graphic
post-processing for linear analog circuits.
The program provides
several tools to create the schematic of a linear analog circuit, perform
its symbolic analysis (find the network function in the Laplace domain
with symbolic parameters), and to show the results in graphic form.
In the schematic
capture option, the main screen is a white sheet where the user can
draw a circuit by using typical Windows tools to copy, cut, paste,
move and edit a component or a part of the schematic.
All passive and
active, bipolar and two-port, linear components are available,
including RLC elements, controlled sources, operational amplifiers and
small-signal equivalent models of BJT and MOSFET transistors.
The simulator can
calculate the symbolic network function of the circuit with an
adjustable "symbolic level", namely, each component can
appear in the network function with its symbolic name or with a
The program contains
a user controlled approximation routine to reduce the symbolic
expression to its most significant terms and suppress the others.
The graphical post
processor is able to show the network function and to plot gain,
phase, delay, poles and zeros position, time-domain step and impulse
The program is
written in C++ and runs on PC Windows (95/98/ME/NT/2000/XP) environment.