eldo_user

Analyzing Simulation Results
Non-Convergence Analysis
The -diagmode conv argument also activates two other analyses.
• The first returns the nodes that are either leading to a time step rejection because of
newton or because of the local truncation error.
• The other is the “stiff signal” detection returning the 20 nodes with the steepest voltage
variation.
During the new simulation Eldo triggers some automatic analyses when it detects convergence
difficulties. Eldo checks the characteristics of some of the devices (diodes, BJT, JFET, MOS
and Verilog-A instances) connected to the nodes that are suspected as problematic. Eldo creates
a new database, .diagmode.wdb (where filename is either the netlist name or the
name specified by the -out argument), containing all the sweeps it performed, assuming the
simulator detected at least one non-monotonous characteristic. Information is displayed in the
terminal, for example:
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Eldo® User's Manual, 15.3