Spectrum Software
Industrial Strength Simulation




Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.




Easily Overlooked Features - Summer 2007


This section is designed to highlight one or two features per issue that may be overlooked because they are not made visually obvious with a toolbar button.

Envelope command
In some simulations, it can be quite useful to view the spread of waveforms rather than each individual waveform. This is particularly true in many Monte Carlo simulations where the range of results can be more important than an individual run in the analysis. Micro-Cap has an Envelope command available under the Scope menu that creates a polygon which will encompass all of the branches of a Monte Carlo or stepped run. This command provides a simple way to graphically capture the plot variation. The plot below displays the effect of the Envelope command on a Monte Carlo simulation in AC analysis.

Envelope command used on a Monte Carlo analysis

The Envelope command is available once the simulation has finished. It creates a closed polygon in the analysis plot that spans the high and low values at each data point. Once created, the polygon is a graphic object in the analysis and can be deleted in the same manner as other graphic objects by selecting it and hitting Delete.

The polygon does not adjust with future runs so to update the envelope for a new simulation, the old polygon would need to be deleted and then the Envelope command would need to be invoked again.

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