# Qucs-S 25.1.1

## Bugfixes and general improvemnt

* Add UIC option for FFT analysis #1261
* Improve wire editing #1253
* Fix crash when deleting shorted devices #1254
* Fix removing labels #1255

## Localization

* Russian translation update #1246

## Packaging

* Update Gentoo ebuidl #1252

## Known issues

* The .OPTIONS and .FUNC devices not working properly. Use the *INCLUDE SCRIPT* instead. See #1260

# Qucs-S 25.1.0

## New features

* Component properties dialog redesign #1054
* CDL netlist export #1165
* Implemented plotting XSPICE digital nodes #1138
* Add individual CLI oparameters setting for each simulator #1152
* Add .CSPARAM virtual device #1136
* Add Qt aplication style selection #1118
* Add default graph line thickness setting #1066
* Add setting for grid visibility  #1065
* Allow parameter passing for SPICE file device #1197
* S-parameter files viewer improvements #1133
* Added background when renderign DC bias labels #1121
* Added possibility to create libraries from SpiceLibraryDevice components #944 #1210
* Added two new wire forms #1232

## Bugfixes and general improvemnt

* CI improvement #1103 #1091 #1086
* Fixed graph renderign performance #984
* Fixed SPICE models processing bugs #861 #1055 #1090 #1142
* Default shorted resistance changed from 0 Ohms to 1/GMIN #1116
* Fixed diagram memory leak #1139
* Added offset parameter for AC current source #1218
* Fixed schematic editing issues #1159 #1134

## Component library

This release contains a massive library extention:

* Added libraries for 74HC, 74LV, CD4000 digital ICs for analog mode #1034 #1160
* Added XSPICE generic logic gates library for analog mode #1199
* Added XSPICE digital auxillary devices #1193
* Added Laser diode library #942
* Added generic triac device in Thyristor.lib #924
* Added vaccum tubes extended library #846 #1216
* Added neon bulb model #846 #1216
* Added MOC3063/MOC3062 optocouple models #846 #1216
* Added Analog ICs and dual gate MOSFET libraries #1229
* Added RC with parasitics library #1240

## Packaging

* Qt5 build deprecated; switch to Qt6 by default #938
* Windows package improvements #1123

## Localization

* Update Turkish translation #1094


# Qucs-S 24.4.1

## Bugfixes

* Improved diagrams rendering speed #1042
* Fixed hardcoded version in LC Cauer filter #1039
* Fixed pulsed current source issues #1059
* Fixed show exit status if Ngspice crashes #1001

## Localization

* Russian translation update #1038

## Packaging

* Prepare for Flatpak package #51

# Qucs-S 24.4.0

## New features

* Implemnted touchstone (S2P) files viewer tool #936
* VC resistor made available for SPICE and ADMS-independent #959

## Library update

* Added SPICE_Tline library containing transmission lines for Ngspice #896

## Bugfixes

* Don't resolve paths to relaive if document is not saved and not belong to project #951
* Allow variables for potentiometer and diode device properties #1021 #1013
* Fixed simulation properties editing #968
* Fixed disbale simulation for XYCE #965
* Fixed running simulation in CLI mode #962
* Fixed memory leaks #960
* Fixed BJTsub and diode devices #983
* Fixed Schottky diode symbol appearence #1027
* Fixed crash if no simulator found on the first start #979
* Fixed artifacts when selecting elliptic arc #987
* Fixed text rendiering for Qt6.8.0 #1002

## QucsatorRF

* QucsatorRF updated to v1.0.3. See the release notes. 

# Qucs-S 24.3.2

## Bugfixes

* Fixed editing of File-type properties #948
* Implemented @model[param] syntax recognition for Parameter sweep #948

# Qucs-S 24.3.1

## Packaging

* Stable release packages are now generated autmatically using Github CI #871

## QucsatorRF

* QucsatorRF updated to v1.0.2; See the release notes

## Bugfixes and general improvements

* Improved temperature sweep using unified devices #925
* Fixed library manger always substitute absoute path #923
* Fixed stars/circles/arrows plots rendering #892
* Fixed library devices symbol text rendering #873
* Fixed touchstones files export from GUI #910
* Fixed mathicng circuit tool issues #905
* Implemented SPICE entry for DC block and DC feed #889
* Fixed Octave start #883
* Fixed right scroll issue #884
* Fixed wires selection issue #875
* Fixed decimal separators processing in attenuator tool #864
* Fixed shortcut conflict #930
* Schematic version check checks only major version #931

## Libraries

* Update Optocoupler.lib #846

## Localization

* Updated Russian translation #885


# Qucs-S 24.3.0

## New features

* SpiceLibComp redesign. This device is renamed to *Spice Library Device* and provides an easy way 
  to add SPICE model to schematic and assign symbol to it. See #679
* Added possibity to import SPICE model for Diode, BJT, MOSFET, and JFET unified devices (blue) #795
* Implemeted symbol files (`*.sym`)  editing mode. These files are needed to attach symbol to SPICE devices #700
* Redesign of schematic rendering engine. Improve rendering quality on HiDPI displays #723
* Improved Qucsconv GUI to reflect new converter features #826
* Improved libraries portability, relative path support for libraries, show libraries from project directory #567
* Added a global setting for Ngspice compatibility mode (LTspice, HSPICE, etc.) #851
* Add global Ngspice compatibility mode (LTspice/HSPICE/S3) setting #851
* QucsatorRF updated to version 1.0.1

## Deprecated features

* The `*.qucs` binary archives are not supported anymore. Use system archivers to pack the projects instead #811
* The `SweepModel` property of *Parameter Sweep* simulaiton has been deprecated. It is not needed anymore after Ngspice
  has added variable sweep feature. Use variable sweep instead #839
* Toolbars and status bar made always visible #852
* Icons theme settings removed from settings dialog. These settings have no effect since v2.1.0
  when unified and auto-generated icons were introduced.

## Packaging

* Linux DEB and RPM packages switched to Qt6
* Windows package switched to Qt6
* Introduced continous release of Linux, Windows, and Mac packages #719 
* Added MacOS package build #797 and homebrew support #804

## General improvements

* The TEMP and TEMPER variables are recognized by parameter sweep to apply temperature sweep #816
* Fixed ASCO optimization with QucsatorRF #830
* Enabled variables as parameters for unified nonlinear devices and pulsed source #838 and #808
* Fixed issues with XYCE simulation #701
* Improved attenuator synthesis tool #722
* Improved filter synthesis tool #715 #673
* Redesign *File->Open examples* menu. Show open dialog instead of file manager #672
* Qucs-S now follows XDG standard for cached data location #145
* Apply .OPTION INTERP when simulating transient with parameter sweep; prevent broken par. sweep data  #766
* Implemented relative paths support for library devices #567

## Component library

* Added PWM controllers (TL494, UC384x, etc.) library #846
* Added Germanium diodes library #846
* Added Mixer IC library containing SA612 model #846
* Added Diodes extended library containing different USSR diodes models
* Added new Varactor library #759
* Added new PIN diode library #764

## Localization

* Russian translation update

# Qucs-S 24.2.1

This release contains no new features except the fixing of the critical bugs.

## General improvements

* Fixed zero output on DC bias simulation (F8) #667
* Fixed build failure of the Fedora RPM becuase of RPATH in qucsator_rf

# Qucs-S 24.2.0

## 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 fixes

* Fixed parameter sweep step issues #186 @ivandi69
* Fixed SPICE devices bounding box #590 #637
* Fixed netlist export from CLI #639
* Fixed parameter sweep simulation with Xyce #624
* Revert explicit WITH_QT6 compile flag because of cmake bug #592
* Fixed tuner issues for German locale #416
* Refactoring in schematic editor #626 #618 @wawuwo

## Localization

* Russian translation update

# Qucs-S 24.1.0

## 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

## 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
* HiDPI support improvements including grid rendering
* Fixed schematic glitches using Wayland #227
* Added text document zoom and font setting #534

## Documentation

* Added new examples 
* Added Ngspice templates #441
* The readthdocs documentantion is a candidate for deprecation #554

## Localization

* Added Chinese translation #453 by @hvwyl

Thanks @wawuwo and @iwbnwif for providing refactoring PRs! Many thanks to @tomhajjar for providing libraries, examples and testing.

# Qucs-S 2.1.0

## New features

* Added tuner simulation mode #123 (used implementation by @tipofthesowrd)
* Added support for touchstone s2p file devices for Ngspice #233 (implementation by @transmitterdan)
* Redesign of the simulation window #309
* Diagrams are placed on schematic and `*.dpl` files are disabled by default  #309 
* Backport of the active Legendre filter synthesis from Qucs-0.0.20rc2 #318
* Added SPICE entry for MUT and MUT2 devices
* Backported circular waveguide and tapered line symbols from Qucs-0.0.20rc2
* Added zoom to selection mode #327
* Toolbar icons replaced by SVG; improved look for HiDPI #323 #304
* Implemented automatic generation of high resolution device icons #334 #304

## General improvements

* Added Tstart option for Spectrum simulaiton #336
* Added low voltage for VRect source #310
* Russian translation update #292 #324
* Added SPICE group for project tree

## Bugfixes

* Fixed simulation of the files with double extension #311
* Fixed simulation of the files containing unicode symbols #312
* Fixed display of the Xanalogue.lib library #308
* Fixed show checker errors for Xyce
* Fixed load symbol for Verilog-A device #321
* Fixed component rotation with right mouse button

## Library

* Added thyristor library #212
* Added optocoupler library #213
* Added photovoltaic relays library #222

## Documentation

* Added subcircuit symbol templates to `share/qucs_s/examples/symbols` (by @tomhajjar)
* Added sections on tuner mode and RF simulation to the Qucs-S tutorial

## Packaging

* Windows 32-bit package is not provided anymore

# Qucs-S 2.0.0

## New features

* Implemented quick switch of the simulator without application restart #274 (thanks @Zergud)

## Packaging

* Linux AppImage build switched to Github workflow #281 
* Added Windows 64-bit installer with Ngspice

## Component library

* Fixed issues in Transformers library #228 and #231

## General improvements

* Finished Qt6 porting #190
* Show warning if the directory protected by Windows UAC #282
* Fixed PDF print on Windows #285
* Added option to export grayscale image #288
* Fixed setting initial conditions in wire labels #291
* Fixed missing ground warning

# Qucs-S 1.1.0

## 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
* Selection rectangle update #276

## 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;