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 - Winter 2008


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.

Embedding Formulas in Grid or Analysis Text
Formulas may be embedded within a text string in either the schematic or the analysis. This provides a powerful tool for documentation by automatically computing and displaying new design values from formulas. The Grid Text dialog box appears below. To have a formula evaluated within the text string, the Formula checkbox within the Text tab needs to be enabled. The Delimiter text field specifies the delimiters that are to be used to bracket the formula. The default delimiters are the brackets, [ ]. Anything between the delimiters will be evaluated as an expression.

Grid Text dialog box

For example, if the following three pieces of grid text are entered in the schematic:

.define C1 6.8n

.define R1 1.3k

The time constant of the circuit is [R1*C1]s.

The last text string will actually appear on the schematic as follows:

The time constant of the circuit is 8.84us.

If either of the C1 and R1 values are modified, then the formula will also be updated to display the new value.

Circuit variables such as V(Out), I(D1), or R(R2) may also be used within a formula. Formulas using circuit variables will only be able to be evaluated when an analysis has just been run.

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