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.




Initial Conditions


I set an initial condition for a capacitor in its CAPACITANCE attribute as '10p IC=10', but when I run the analysis, I get -10V across the capacitor. Why?


The capacitor does have polarity, so this condition will place 10V across the capacitor in relation to its plus and minus pins. You can view which pin is which by enabling the Display Pin Names checkbox in the Attribute dialog box. If the polarity is reversed, just rotate the capacitor so that the plus pin and the minus pin are swapped, or you can just set the initial condition to -10V.

You may also change the shape of the capacitor so that it displays a + and - just as the inductor does. There are shapes already created for this purpose. In the Attribute Dialog Box, select the SHAPEGROUP attribute. In the Value field at the top, click on the drop down arrow. A list of available Shape Groups for the part will appear. Select Polarity. Hit OK, and the shape for that specific capacitor will now be changed to show the + and - signs.






AC Analysis
Analysis - General
DC Analysis
Dynamic DC
Initial Conditions
Monte Carlo
Schematic Editor
Transient Analysis