Qucs library download code#

One code word often found in the SPICE extended subcircuit syntax is the term PARAMS. This works well, but does have one disadvantage however, in that some published subcircuit netlists may require a small amount of editing before they will simulate with Spice4qucs. Implements a common subset of the published extended SPICE subcircuit syntax. One consequence of this is that over time divergence of the SPICE subcircuit statement syntax has occurred amongst different circuit simulators. Recent generations of open-source GPL circuit simulators, including Ngspice, Xyce and SPICE OPUS, have been extended by their Development Teams to allow subcircuits with parameters. Unfortunately, SPICE 3f5 only implements subcircuits without parameters. Require component values or device parameter values of differing value. This form of subcircuit can, for example, be used to represent manufacturers product variations which have identical circuits but Subcircuits which have component or physical parameter values set by a list of names and values attached to a schematic symbol add a significant “value added”įeature to the subcircuit concept. This topic and other aspects of Xyce post simulation data processingĪre covered in later sections of this help manual. Implemented in Xyce, allowing algebraic expressions for data processing to be embedded in. However, to minimise the effects of this omission an extended form of the SPICE. This implies that Nutmeg style post simulation data processing is not possible with Xyce.

Qucs library download simulator#

The Xyce circuit simulator does not include a version of Nutmeg in its distribution package. If problems/bugs, due to implementationĭifferences, surface in the future the spice4qucs Development Team will attempt to correct them as quickly as possible. The extent to how this will affect the operation of spice4qucs is at this time unclear. These are not the same however, mainly because the SPICE OPUS development team have modified the original SPICE 3f5 Nutmeg package to firstly remove errors/bugsĪnd secondly to improve its syntax. This is because Ngspice and SPICEOPUS both include implementations of the SPICE 3f5 Nutmeg post simulation data processing package that is distributed with their SPICE engines. Most readers will probably have noticed that the SPICE netlists for the Ngspice and SPICEOPUS band pass filter test benches are identical except for file names. This introduction isįollowed by a detailed description of the structure, and netlist syntax, of subcircuits with one or more parameters.įigure 3.5 Band pass filter SPICEOPUS test results and SPICE netlist for test bench circuit. However, an optional part of the Ngspice, Xyce and SPICE OPUS subcircuit netlist syntax that signifies that a parameterĮxtension is present is not allowed (see section 3.1.2).Īs a starting point spice4qucs subcircuits without parameters are considered first. In a similar fashion to Qucs, the Ngspice, Xyce and SPICE OPUS circuit simulators allow subcircuits with or without parameters. Spice4qucs supports all the features available with Qucs subcircuits. This is not surprising because they formĪ natural way of breaking an electonic system down into a number of smaller self contained functional blocks. Today, all practical circuit simulators have subcircuits as part of their basic device compliment. Subcircuits are a concept that has been part of established circuit simulation practice since the early days of computer aided circuit design. Spice4qucs Subcircuits: with and without parameters ¶

Qucs-S/Octave circuit simulation and device parameter extraction interface.

RF simulation with Ngspice, Xyce and SPICE OPUS.

Verilog-A compact semiconductor device modelling.

Introduction to mixed analogue/digital simulation.

XSPICE user written device models and library.

Qucs and SPICE simulation models that work with Ngspice, Xyce and SPICE OPUS.

Ngspice, Xyce and SPICE OPUS post-simulation data processing with Qucs-S and Octave.

More advanced circuit simulation techniques.

Device and component modelling with algebraic equations.

Symbol pattern files format description.

Using manufacturers component data libraries.

A second more complex example of Spice4qucs subcircuits with parameters.

Spice4qucs subcircuits without parameters.Spice4qucs Subcircuits: with and without parameters.Spice4qucs subcircuits, macromodels and device libraries.Basic Ngspice, Xyce and SPICE OPUS simulation.