qucs_s/NEWS.md

Qucs-S 1.0.3

New features

• Qucs-S supports digital simulation mode using IcarusVerilog or FreeHDL backends #97
• Added analog model for digital source #265
• Qucs-S runs DC bias simulation mode if schematic contains DC simulation only #271

Deprecated features

• XSPICE CodeModel synthesiszer has been deprected since v1.0.3. The precompiled CM libraries are still supported using spiceinit virtual device. See #204

Known issues of digital simulation

• Digital buses are not supported;
• Digital simulation represents its state as of Qucs-0.0.20-RC1; No new features added

Qucs-S 1.0.2

New features

• Added XSPICE flip-flop digital devices #262 (thanks @Radvall)
• Added INDQ and CAPQ devices representing inductor and capacitor with Q-factor #143
• Added .LIB directive support #242
• Added SPICE entries for I and V file sources #254
• Added symbols for 4 and 5 terminal BJT device #198

Component library

• Added behavioral XSPICE 555 timer model #252

General improvements

• Added option to save SPICE netlist without simulation #225
• Improved Qt6 compatibility (thanks @Zergud)
• Improved MacOS compatibility (thanks @nanoant) #214
• CMake build system update to bring features of the modern CMake (thanks @dsm) #216

Qucs-S 1.0.1

New features

• Added support for Verilog-A defined devices using Ngspice+OpenVAF #197. Old Qucsator+ADMS workflow is marked as deprecated. Ngspice >=39 is required to support OpenVAF.
• Implemented variable parameter sweep analysis #189
• Added possibility to build Qucs-S with Qt6 #190 The -DWITH=QT6=ON option for cmake is required. The source code of the Qucs-S is Qt6 compatible now. Thanks @Zergud !
• Simulator prefixes like "ngspice/" are not show anymore on plot traces if the plot contains data from only one simulator #178

Component library

• Added TL071/TL072 opamp models
• Added 555_timer.lib library containing the 555 timer model
• Added extended BJT exteneded and Schottky diodes libraries

Bugfix and general improvements

• Change default RCL device values and simulation settings to prevent convergence error when putting together device with default values #195
• Fixed auto-scaling issue on Windows 64-bit platform #133

Qucs-S 1.0.0

New features

• Added basic support for logic gates simulation (Ngspice >= 38) required #97
• Added possibility to set engineering notation (like 1k, 1M, etc.) for numbers on diagrams #92
• Added symbol preview and search feature for component library in main windows #135
• Backported qucs-attenuator, qucs-transcalc and qucs-powercombining from Qucs-0.0.20 #142
• Added possibility to set dB units for Y-axis on digrams from the diagram properties dialog #92
• Backported advanced features for projects tree from Qucs-0.0.20 #95
• Show warning if schematic file name changed, but dataset/display file name are not updated #111
• Revised examples tree (by Tom Hajjar @tomhajjar); legacy Ngspice-incompatible examples moved to examples/qucsator subdirectory

Component library

• Qucs-lib tool has been removed from the application; all its features are availbale now from the main window left panel #139
• Fixed Tubes.lib and LEDs.lib libraries (by @tomhajjar)

General improvements

• Fixed numerous bug reports. Thanks @tomhajjar and @Zergud for testing.

Windows

• Added 32-bit Windows portable package

Known issues

• Parameter sweep doesn't work when using the Fourier simulation with XYCE backend #73
• Netlister may produce duplicate .SUBCKT entry when using the same component from user and system library #82
• Auto-scaling on diagram may fail on some conditions for Windows 64-bit platform #133 Other platforms are not affected
• The 1-point AC simulation produce a set of 1x1 plot if ParameterSweep instead of smooth curve is attached #156

Qucs-S 0.0.24

New simulation types

• Added S-parameter simulation using Ngspice and Xyce backends; Ngspice>=37 requiered #84, #79
• Added FFT analysis with Ngspice backend #88

GUI improvements

• Implemented dark desktop theme support #66
• Implemented manual setting of the X-axis markers postion #92
• Added separate setting for schematic and application font

Qt5 support

• Removed QtScript dependency (thanks @Zergud) #77
• Fixed Qt5.15 deprecation warnings #75

Component libraries

• Added quartz crystal library (Crystal.lib); the quartz model is optimized for filter design;
• Added TL431 device in Regulators library;

General bugfixes

• Fixed crash on HB simulation with XYCE #28
• Fixed empty path for working directory #86
• Show error when schematic contains only DC simulation (no effect for Ngspice) #83
• Fixed layout in arrow properties dialog #81
• Fixed drag'n'drop operation from left dock to schematic
• Fixed newlines in SPICE resitors #62
• Fixed crash on Wayland #76

Documentation and examples

• Added offline PDF tutorial; the link for old Qucs tutorial removed from Help menu #78
• Added examples for new S-parameter and FFT simulations
• Fixed distortion simulation example #83

Known issues

• Parameter sweep doesn't work when using the Fourier simulation with XYCE backend #73
• Netlister may produce duplicate .SUBCKT entry when using the same component from user and system library #82

Qucs-S 0.0.23

Qt5 support and new features

• The Qucs-S application is now fully ported to Qt5 and could be compiled on modern Linux distributions; #72 #32
• Added two new component libraries: BF998 and Tubes containing two-gate MOSFET and vacuum tubes (triodes and penthodes provided by @olegkapitonov ) models;
• Windows binary switched to 64-bit build. The old 32-bit binaries are not provided anymore;
• Ngspice is now the default simulation kernel on the first application start;
• The Qucs-S doesn't use a shared settings file with Qucs anymore #71

General bugfixes

• Fixed "Show last netlists" not showing SPICE netlist when SPICE engine is selected #41
• Use system default sans serif font instead of "Helvetica", because "Helvetica" cannot be rendered correctly on some platforms;
• Fixed .INCLUDE directive support with SpiceOpus #16
• Partially fixed .FOUR simulation support for Xyce backend #73
• Removed warning about experimental feature in the simulation dialog. Qucs-S is considered to be stable now;