eldo_user

Setting Up An Analysis
Operating Point Analysis
In the following example Eldo performs a DC analysis at times 20ns and 40ns during a transient
analysis from 0 to 100ns.
.DC TIME=20n 40n
.TRAN 1n 100n
The results of DC analysis during transient analysis are output using:
.EXTRACT DC TIME=...
Limitations:
• Only one .DC command with time specifications is allowed: subsequent commands are
ignored.
• Not supported for Questa ADMS, SST/MODSST analysis, and NOISETRAN analysis.
See Also
• .DC in the Eldo Reference Manual
• .EXTRACT in the Eldo Reference Manual
• .TRAN in the Eldo Reference Manual
Related Topics
DC Analysis
Operating Point Analysis
The .OP command determines the DC Operating Point (DCOP) of the circuit with inductors
short-circuited and capacitors opened. If either the specified simulation time is reached or one
of the conditions described in the “optional parameters” is fulfilled, the DC operating point is
saved to the .chi file.
If no parameter is specified, the operating point information is saved for DC prior to AC, or first
DC analysis in the case of a DC sweep.
.OP analysis is automatically performed before an .AC analyses.
Tip
See “.OP” in the Eldo Reference Manual.
DC Operating Point Calculation for RF
The DC operating point calculation for Eldo RF differs from the Eldo .OP command by using
an average value of the source, even if a DC value is specified.
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Eldo® User's Manual, 15.3