eldo_user

Setting Up An Analysis
Aging and Reliability Analysis
Thus, the designer’s task is to discover what is the most appropriate model for their
requirements.
An objective is anything that can be extracted or measured from the output waveform. Regular
.EXTRACT statements can be specified with additional optimization parameters, or the
.OBJECTIVE command—specifically dedicated to optimization—can be used for more
complex objectives.
Tip
See “.OPTIMIZE” in the Eldo Reference Manual.
Optimization Results
The results of optimization must be analyzed to verify whether the optimization has succeeded
in its task of finding a solution. The results of optimization are output using the .EXTRACT and
.PLOT commands and provided in two ways:
• ASCII Output
o
o
The Eldo standard output (.chi) file provides simplified information about the
optimization process.
The results of optimization are generated in a .otm file. This is a structured text file
separated into three major sections: initialization (scaling of variables and
objectives), optimization phase, and the results of the process (final variables and
objectives). Run the utility named viewotm on the .otm file to display the results.
• Graphical Output
Extracted waveforms generated during an optimization process can be viewed using
EZwave. These are implicitly declared waves which have the same name as the extract
label they refer to.
Related Topics
Optimization
Aging and Reliability Analysis
Reliability models are implemented in the Eldo UDRM (User Defined Reliability Model)
interface.
The objective of aging and reliability simulation is to be able to model the gradual damage,
which occurs to the devices in a certain design causing degradation in the performance of that
design. It is required to evaluate the amount of degradation occurring in a certain period of
operation and examine the circuit performance after this period. The modeled damage could
follow one or more of several damage mechanisms, which show gradual degradation in device
Eldo® User's Manual, 15.3 277