Notice in this example the SPICE optimizer ASCO is used to nd the values of L, C and LL which mini-mize CF1 and CF2. Both the S parameter data and the impedance data are displayed as graphs in Figure8. Models are provided by device makers, distributors or web sites like this one. Qucs post-simulation processing is also used to extract values for the real and imaginary components of the RF resistor impedance. Indeed device models have to be added manually to the devices in the circuit schematic, when invoking ngspice via KiCad or QUCS-S, except for some basic devices with integrated models. A growing community is supporting digital, analog or mixed-signal design flows. Device models are available by the Open Source PDKs from Google/Skywater, Google/GF, or IHP. KiCad integrates ngspice internally, but may also provide external ngspice with netlists for simulation.Īnother GUI to ngspice is XSCHEM, especially useful for IC design work (see ). You may watch several simulation examples (including oscillators) here. KiCad may be used as a schematic entry tool for ngspice, especially for discrete or PCB-based electronics. When talking about open source tools, here are some: AD and Qorvo aren't remotely in the software and EDA business, so their decision to keep them closed is even more puzzling, but I guess the instinct of hardware companies is guard everything. LTspice is kind of an advertisement for AD's chips. QucsStudio was taken closed-source by Qucs' original author, and he's not commented on his intentions in this decision.īig companies typically open-source software when it's not part of their strategic business value, and offers community engagement benefits and good press. This modelling route is a very important and powerful model development tool. The recently-released QSpice (sponsored by Qorvo) also closed-source. Both the SPICE to Qucs and OP AMP tutorials7 outline in detail the steps required to merge circuit design and simulation in this way. LTspice (sponsored by Analog Devices) is closed-source. SPICE predates copyleft licensing, so software that was once open has disappeared into proprietary versions. It's nice that there are several free-as-in-beer options available, but a good lesson in the consequences of permissive open-source licenses. 23, Jan, 2007, Two new components: 4-terminal. Any way to use SPICE model for specific transistors in QucsStudio 14. This schematic specifies two simulations: AC simulation from 4 MHz to 12 MHz. Qucs notation is converted to SPICE notation automatically, where the Qucs EDD. A simple RCL test circuit for demonstrating Ngspice, Xyce and SPICE OPUS simulation controlled from Qucs. The windows qucs runs the tutorial completely with the results showing up in the "Tabular’ as is shown in the tutorial.Īnyone have an idea of what’s wrong with linux compiled qucs-s 0.23 in displaying results.It's a shame that circuit simulators, especially those derived from SPICE, have tended toward closed-source. New tutorial Qucs simulation of SPICE netlists provided by Mike Brinson. Qucs and SPICE simulation models that work with ngspice, Xyce and SPICE OPUS. I have also set up qucs 0.19 – windows version into wine on my linux pc. That again solved the schematic but displayed no results giving the same dialogue as above. If I enter a name such as “divider” and click that to the right side, it still has no value associated with “divider” voltage.Īdditionally, I tried the qucs 0…23 AppImage package. Post simulation dialogue says:Ĭircuit: * qucs 0.0.23 /home/tom/.qucs/examples_prj/dc-1.schīut on the results page, after selecing “Tabular”, a table opens but there are no results shown for selection as is presented in the tutorial. In setting up the initial tutorial schematic (voltage divider), all goes well. Go to examples Examples For an easy start have a look at the QucsStudio example projects. View Examples For an easy start have a look at the QucsStudio example projects. I have compiled qucs-s 0.23 on opensuse leap 15.3. Screenshots Get a first impression about QucsStudios feature set in our screenshot and video galery. If there are any qucs (electrical circuit analyzer) experts viewing, here is my problem.
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