Qucs-S is a circuit simulation program based on Qucs circuit simulator. The "S" letter indicates SPICE. The purpose of the Qucs-S project is to use free SPICE circuit simulation kernels with the GUI based on Qt toolkit. It merges the power of SPICE and the simplicity of the Qucs GUI. Qucs-S is not a simulator by itself, but it requires to use an external simulation backend with it. Qucs-S allows to use the following open-source simulation kernels:
Ngspice is recommended to use. Ngspice is powerful mixed-level/mixed-signal circuit simulator. The most of industrial SPICE models are compatible with Ngspice. It has an excellent performance for time-domain simulation of switching circuits and powerful postprocessor.
XYCE is a new SPICE-compatible circuit simulator written by Sandia from the scratch. It supports basic SPICE simulation types and has an advanced RF simulation features such as Harmonic balance simulation.
SpiceOpus is developed by the Faculty of Electrical Engineering of the Ljubljana University. It based on the SPICE-3f5 code
Qucsator as backward compatible and for RF and microwave circuits design.
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Recent Releases
24.2.131 Mar 2024 16:25
minor bugfix:
This release contains no new features except the ing of the critical.
General improvements:
Zero output on DC bias simulation (F8) #667.
Build failure of the Fedora RPM becuase of RPATH in qucsator_rf.
24.2.026 Mar 2024 11:05
major bugfix:
New features:
QucsatorRF is now a part of the package; No need to compile and install qucsator manually #370.
Qucs-RFLayout tool could be launched from *Tools menu #465; this tool must be installed separated.
Redesign of the Qucsconv GUI #647.
Matching tool backported from Qucs-0.0.20 #401.
Added *RF devices group; backported different RF devices for Qucsator #607.
General imporvements and :
parameter sweep step @ivandi69.
SPICE devices bounding box #590 #637.
netlist export from CLI #639.
parameter sweep simulation with Xyce #624.
Revert explicit WITH_QT6 compile flag because of cmake tuner for German locale #416.
Refactoring in schematic editor #626 #618 @wawuwo.
Localization:
Russian translation update.
24.1.018 Feb 2024 13:35
major feature:
Important notes
Versioning switched to CalVer. The first digit means year, the second digit means the release number,
the third digit means patch number #328
Qucs-S is now on Telegram. Join https://t.me/qucs_s to ask questions and get news
New features
Added 3-pin RCD devices #349 to improve support of microelectronics PDKs
Improvements of Ngspice support; allowed multiple simulation of the same type #463 by @ivandi69
Automatic extraction of THD from FOURIER simulation #525 @ivandi69
Nutmeg equations improvements; implemented simulation selection from drop-down list #463 #519
Improvements of Nutmeg script simulation type; implemented custom prefixes for plots #476 #435 @ivandi69
Export DC OP simulation data to dataset #463 #140 @ivandi69
Implemented zoom by selection on the rectangular plots #305
Implemeted potentiometer device #122
Switched digital simulation from FreeHDL to GHDL #395 @iwbnwif
Status bar improvements #493
RF simulation features
Added RCLG device support for SPICE #564
Added YLIN device support for XYCE #451
Fixed touchstone simulation issues for Ngspice #392
Added BiasT device support for SPICE #374
Added option to disable transient model for RF port #410
Libraries
Fixed different issues related to creating libraries #432
Added audio IC library
Added loudspeaker library #421
Added comparators library #436
Modified voltage regulators library #433
Added voltage references library #439
Added thermistor library #538
Fixed ideal library #258 #428
Fixed transformers library #362
Added new devices in SpiceOpamp library #501
General improvements
Fixed different tuner issues
Schematic zooming improvements #502
Different improvements on schematic look and control
Added schematic pan mode with the middle mouse button #488
Many HiDPI support improvements including grid rendering
Fixed schematic glitches using Wayland