User Guide

Chapter B Convergence and “time step too small errors”
394
The
Last node voltages tried... trailer shows the
voltages tried at the last Newton-Raphson iteration. If any
of the nodes have unreasonable large values this is a clue
that these nodes are related to the problem. “These
voltages failed to converge” lists the specific nodes which
did not settle onto consistent values. It also shows their
values for the last two iterations. “These supply currents
failed converge” does the same for currents through
voltage sources and inductors. If any of the listed numbers
are +/- 1e10 then that is an indication that the value is
being clipped from an unreasonable value. Finally, “These
devices failed to converge” shows devices whose terminal
currents or core fluxes did not settle onto consistent
values.
The message gives a clue as to the part of the circuit which
is causing the problem. Looking at those devices and/or
nodes for the problems discussed above is recommended.
Pspug.book Page 394 Wednesday, November 11, 1998 1:14 PM