Initial Conditions for Transient Analysis

Transient analysis obtains a set of initial 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 affects the DC calculation done to obtain the initial conditions for transient analysis. See DC Analysis Options.

Some options (in particular, abstol and reltol) can affect both DC analysis and transient analysis. See Circuit Transient Analysis Options for further information.

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.