eldo_user

Setting Up An Analysis
Saving and Restarting DC Simulations
3. Change the circuit description file to include any other analysis required. Do not specify
DC, UIC or operating point calculation. Add to the circuit description file one of the
lines:
.USE IC
.USE NODESET
.USE GUESS
! to use .IC
! to use .NODESET
! to use .GUESS
Rerun the simulation. Eldo will attempt to use the operating point information stored in
the file.
Eldo provides a system of combining the DC values of parts of a circuit to speed up the
operating point calculation of the complete circuit. The DC state of the circuit sections that are
available are stored in separate files. Such circuit parts may be whole subcircuits. In the general
case, the DC data will be available in several files, called here OPDATA_SS. To use such data
for the DC calculation of a complete circuit, add one of the following lines to the circuit
description file, and for each OPDATA_SS file:
• for usage with the .IC command:
.USE IC
• for usage with the .NODESET command:
.USE NODESET
• for usage with the .GUESS command:
.USE GUESS
Eldo will attempt to use the operating point information stored in all the OPDATA files.
Note
As a guide to choosing the appropriate command, .IC has more constraints than
.NODESET, which has more constraints than .GUESS.
Related Commands
• .USE in the Eldo Reference Manual
Related Topics
DC Analysis
Improving DC Convergence
Saving and Restarting Transient Simulations
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Eldo® User's Manual, 15.3