Qucs 0.0.9 has been released.

Qucs 0.0.9 has been released.

The Qucs project (Qucs = Quite Universal Circuit Simulator) today
announced the immediate availability of Qucs 0.0.9, a Qt-based
advanced and powerful microwave circuit simulator for GNU/Linux and
other UNIXes.

Qucs, including all its libraries and its applications, is available
as free (as in speech) software under Open Source licenses. Qucs can
be obtained in source code from <http://sourceforge.net/projects/qucs>.


Qucs provides a GUI based on Qt for setting up electrical and
electronic circuitry, a simulator, which is able to simulate the small-
and large signal as well as the noise behaviour of these circuits.
The results can be shown on a special presentation page in different
formats (rect, polar, smith, tabular, 3d-cartesian, locus and
polar-smith combinations). Pure digital simulations are also

Compiling Qucs 0.0.9

The complete source code for Qucs 0.0.9 may be freely
downloaded. Instructions on compiling and installing Qucs 0.0.9 are
included in the software archive. Only Qt-Libs >= 3.1 (but < 4.x) and
the glibc are required.

About Qucs

Qucs is an independent project of only a few developers, translators,
etc, collaborating over the Internet to create and freely distribute a
sophisticated, customizable and stable microwave circuit simulator.
For enhancing the development speed we are looking for more
developers, who want to support the Qucs Project.

Changes in this release

The new release comes with a Russian translation and the GUIs language
can be explicitely chosen in the application settings dialog. The
digital simulation abilities have been improved by a VHDL text editor
and hand-crafted VHDL files can be used as subcircuits. The number of
ports of the S-parameter component is no more limited. Components can
now be either deactivated as a short or an open. There are some new
components such as a coaxial line, a differential voltage probe, a
switch, AM- and PM-modulators and a relais. Also many bug-fixes have
been incorporated.

The simulation backend does support the above mentioned new components
as well. Additionally delay times of digital components and controlled
sources during the transient analysis are now considered. There is
a time-domain model of the ideal transmission line and a frequency-
independent loss factor for this component. A damping factor for the AC
voltage and current sources during transient analysis has been
introduced. Temperature coefficients for the resistor have been added.
Certain characteristic values (e.g. ErEff or Zl) of components can be
saved into the dataset during the S-parameter simulation. Moreover the
DC behaviour of the S-parameter file component can be chosen to be
either an open or a short. There have been added many new functions
to the equation solver: ceil, fix, floor, round, step, besselj,
bessely, erf, erfc, cumsum, cumavg, cumprod, sqr, polar, rms, dbm2w,
w2dbm, integrate, dbm, besseli0, erfinv, erfcinv, kbd, runavg, variance,
stddev, Time2Freq and Freq2Time. The functions xvalue, yvalue, min,
max and avg can have an additional range specification and the following
new two-argument functions have been introduced: arctan, min and max.
Last but not least a dataset can now be exported to the csv file format
using the command line converter.


A lot of thanks go to the translators and to the supportive user
responses so far encouraging us to improve the software. We couldn't
have done it without you!

Posted by Stefan Jahn 2006-05-29

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