Eventually, a stage will be reached which allows Qucs to be used productively to model devices and to investigate the performance of circuits. Once these have been mastered users can move on with confidence to next level of understanding. In particular, one of the best ways to become familiar with Qucs is to learn a few basic user rules and how to apply them. New users must realise that to get the best from the software some effort is required on their part. Incidentally, this statement is also true for other GPL circuit simulators. Qucs is a large software package which takes time to learn. In the future, as the Qucs project evolves, the software will also provide circuit designers with a choice of simulation engine selected from the Qucs built-in code, ngspice and Xyce. Recent extensions to the software aim to diversify the Qucs modelling facilities by running the Berkeley Model and Algorithm Prototyping Platform (MAPP) in parallel with Qucs, using Octave launched from the Qucs GUI. As well as extensive circuit simulation capabilities Qucs supports a full range of device modelling features, including non-linear and RF equation-defined device modelling and the use of the Verilog- A hardware description language (HDL) for compact device modelling and macromodelling. ![]() Between 2003, and January 2015, the sourceforge Qucs download statistics show that over one million downloads of the software have been recorded. Similarly, circuit performance optimisation is possible using the A SPICE Circuit Optimizer (ASCO) package or Python code linked to Qucs. ![]() Qucs also allows users to process post-simulation data with the popular Octave numerical data analysis package. Qucs includes built-in code for processing and visualising simulation output data. In the period since Qucs was first released it has evolved into an advanced circuit simulation and device modelling tool with a user friendly graphical user interface (GUI) for circuit schematic capture, for investigating circuit and device properties from DC to RF and beyond, and for launching other circuit simulation software, including the FreeHDL (VHDL) and Icarus Verilog digital simulators. Qucs numbered releases and day-to-day development code snapshots can be downloaded from ( Versions are available for Linux (Ubuntu and other distributions), Mac OS X and the Windows 32 bit operating system. Both binary and source code releases take place at regular intervals. Since its initial public release in 2003 around twenty contributors, from all regions of the world, have invested their expertise and time to support the development of the software. Qucs is the brainchild of German Engineers Michael Margraf and Stefan Jahn. 1 Qucs Help Documentation Release Qucs Team Nov 05, 2017ģ Contents 1 Background 3 2 Getting Started with Qucs Analogue Circuit Simulation 5 3 Getting Started with Optimization 11 4 Getting Started with Octave Scripts 23 5 Short Description of Actions 25 6 Working with Subcircuits 29 7 Getting Started with Digital Simulations 33 8 Short Description of Mathematical Functions 35 9 List of Special Characters Matching Circuits Installed Files Qucs File Formats Subcircuit and Verilog-A RF Circuit Models for Axial and Surface Mounted Resistors 59 iħ CHAPTER 1 Background The Quite universal circuit simulator Qucs (pronounced: kju:ks) is an open source circuit simulator developed by a group of engineers, scientists and mathematicians under the GNU General Public License (GPL).
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