As speed moves up in the double-digit GB/s regime, many industry standards are moving to serial link-based architectures and are using frequency domain compliance limits based on S-parameter measurements.Ī vector network analyzer (VNA) is the test instrument of choice to measure S-parameters from a device under test (DUT). If you have not had to work with them yet, then chances are you will sometime in your career. This topic and other aspects of Xyce post simulation data processingare covered in later sections of this help manual.Signal integrity engineers almost always have to work with S-parameters. PRINT statement has beenimplemented 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. If problems/bugs, due to implementationdifferences, surface in the future the spice4qucs Development Team will attempt to correct them as quickly as possible.The Xyce circuit simulator does not include a version of Nutmeg in its distribution package.This implies that Nutmeg style post simulation data processing is not possible with Xyce. The extent to how this will affect the operation of spice4qucs is at this time unclear. 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 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.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/bugsand secondly to improve its syntax. Any improvements and additionsto the Qucs-0.0.19S model complement will be recorded in this document as they are introduced by theQucs Development Team. More work is planned on model developmentfor later releases of the software, including improvements to power device models and the introduction ofXSPICE digital models for true mixed-mode analogue-digital simulation. PZ simulation yet) and model coverage (for example thenumber of power analogue and digital models are limited). However, there are still significant gaps in the Qucs-0.0.19S simulation capabilities(for example no SPICE 3f5. With the first release of spice4qucs, as Qucs-0.0.19S, this aim has largelybeen achieved. By combining Qucs with ngspice and Xycethe number of available simulation models has increased significantly, making the spice4qucs versionof Qucs more flexible and powerful, when compared to earlier Qucs releases.One of the primary motives behind the development of spice4qucs was to provide Qucsusers with access to published SPICE component models while keeping all the existing Qucs models and simulationcapabilities unchanged. For a circuit simulator to be a useful circuit design aid it must be able to simulatea range of analogue and digital circuits which include passive components, semiconductor devices,integrated circuits and non-electrical devices when needed.
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