Spectrum Software
spacer
Industrial Strength Simulation
select:

divider

 

News:

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.

 

divider

 

Analysis - General

 

I am running a 100ms transient analysis on my schematic. The simulation gets to approximately the 30ms mark, and it then starts the simulation over again. It will then run through the entire simulation and any subsequent simulations. If I revert my circuit, I get the restart again during the first run. Why does the restart occur?

 

In the Preferences dialog box, there is an option called Convergence Assist which will be enabled. Convergence Assist is invoked if the simulation runs into convergence problems. It may modify Global Settings parameters such as RELTOL, ABSTOL, VNTOL, ITL2, ITL4, METHOD, GMIN, and others to achieve convergence. Since a change in the Global Settings can affect the SPICE matrix, the simulation needs to be restarted. If the assist succeeds, it adds a .OPTIONS statement to the text area of the circuit with the modified parameters so that subsequent runs converge more readily.

 

 

 

 

Categories


AC Analysis
Analysis - General
DC Analysis
Dynamic DC
Incompatibilities
Initial Conditions
Miscellaneous
Models
Monte Carlo
Output
Probe
Schematic Editor
Stepping
Transient Analysis