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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Transient Analysis >
   Transient Analysis Technical Notes >
       Initial Conditions for Transient Analysis           


Initial Conditions for Transient Analysis

Transient analysis obtains a set of initial conditions (conditions at time = 0) by performing a DC operating point analysis as described in Nexxim DC Analysis. As in DC analysis, .NODESET and .IC statements may be used to affect the computation of initial conditions.

Any options specified for DC analysis will affect the DC calculation done to obtain the initial conditions for transient analysis. See Nexxim DC Analysis Options for a listing.

Some options (in particular, abstol and reltol ) can affect both DC analysis and transient analysis. To specify different settings for the DC initialization and the subsequent transient analysis, use the prefix dc. for the DC settings and the prefix tran. for the transient analysis settings. In general, option settings with the prefix dc. affect only the DC initialization, and settings with the prefix tran. affect only the transient analysis. An option setting with no prefix affects both the DC and transient analyses. However, dc.abstol or dc.reltol is applied to transient analysis when tran.abstol or tran.reltol is not given explicitly.

Here is an example:

.option dc.conv=3 $ Applies to DC initialization only

.OPTION dc.abstol=4e-12 $ Applies to DC initialization only

.OPTION tran.abstol=1e-9 $ Applies to transient only

.OPTION reltol=2e-4 $ Applies to both DC and transient

(rest of netlist)

.TRAN 1e-3 1

Floating Node Warning

Nexxim issues a warning message if the circuit contains floating nodes or nodes with single connections. Only nodes with a single branch connection that is both conservative and constitutive are flagged. For example, the controlling nodes in a VCVS have a constitutive/behavioral/relational connection to the controlled nodes, but not a physical/structural/conservative connection, and therefore are not flagged.



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