eldo_user

Setting Up An Analysis
Saving and Restarting DC Simulations
this logical initialization; Eldo still considers .NODESET and .IC statements, but all other node
voltages start at zero.
Tip
See “.DC” and “.OPTION NOINIT” in the Eldo Reference Manual.
Related Topics
DC Analysis
Saving and Restarting DC Simulations
A circuit may need to be simulated several times. In each case, the operating point must be
determined, although it may be the same for each run or may be only slightly different; in any
case a large change of operating point is unlikely. To avoid the wasteful recalculation of the
operating point, a system is provided to store and reload the result of the DC analysis from Eldo;
this significantly increases performance, as operating point calculation time is reduced.
.SAVE DC in Combination with .RESTART
The DC or operating point values for a circuit can be saved to a file and used later to greatly
shorten this part of the analysis when the circuit is resimulated. This is achieved by employing
the .SAVE DC and .RESTART commands, provided the circuit node names remain the same.
To restart the simulation, you must modify the circuit description file. Remove the original
.SAVE command, and include a .RESTART command in the circuit description file:
.RESTART
.SAVE DC in Combination with .USE
The DC or operating point values for a circuit can be saved to a file and used later to greatly
shorten this part of the analysis when the circuit is resimulated.This is achieved by employing
the .SAVE DC and .USE commands, provided the circuit node names remain the same. The
following steps are used, assuming that the circuit is stored in the circuit description file
.cir.
1. Add the following line to the circuit description file:
.SAVE DC
If no filename fname is given, the default used is .iic.
2. Run the simulation to find the operating point of the circuit. This is stored in the file as
specified in the .SAVE command.
Eldo® User's Manual, 15.3 215