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Setting Up An Analysis<br />

Saving and Restarting AC Simulations<br />

• .RESTART file_name, where file_name comes from the results of a DC/TRAN<br />

simulation.<br />

• .AC ... UIC command.<br />

then the .RESTART command will be interpreted as:<br />

.USE file_name OVERWRITE_INPUT<br />

A warning message will be displayed that no DC analysis has been performed if attempting to<br />

run an AC simulation with UIC enabled without a restart file.<br />

When initial conditions are used (UIC parameter) Eldo performs a logical initialization prior to<br />

the AC run (that is, no DC analysis to be performed). Specify option NOINIT to disable this<br />

logical initialization; Eldo still considers .NODESET and .IC statements, but all other node<br />

voltages start at zero.<br />

Usage of .RESTART and .TRAN with .NOISETRAN, .MC, .WCASE, .STEP<br />

In the case of .TRAN and .RESTART associated with a .STEP, .MC, .WCASE or<br />

.NOISETRAN, the same restart file will be used for all runs, for example:<br />

.MC 5<br />

.TRAN<br />

.SAVE TIME = ...<br />

.END<br />

In this example you would assume that six restart files would be generated (five MC and one<br />

nominal), and that in subsequent commands:<br />

.MC 5<br />

.TRAN<br />

.RESTART<br />

.END<br />

each run would use its “restart file ancestor”. However, this is not how it works. Eldo will use<br />

only the latest “restart file” which has been generated for all runs, and unless explicitly<br />

specified, Eldo will create a restart file only for the first STEP run or the nominal MC run.<br />

Related Commands<br />

• .OPTION NOINIT in the Eldo Reference Manual<br />

• .AC in the Eldo Reference Manual<br />

• .RESTART in the Eldo Reference Manual<br />

Related Topics<br />

AC Analysis<br />

228<br />

Eldo® User's Manual, 15.3

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