eldo_user

Statistical Experimental Design and Analysis
Designing a Screening Experiment
Designing a Screening Experiment
These sections describe how to specify the parameters (factors) that will be considered by the
.DEX command when conducting the experiment by adding .PARAMDEX command
statements to added to the netlist.
The .PARAMDEX statements can either be prepared by manually editing the working netlist or,
for noise parameters, the .DEX command has a FIND_FACTOR option which can be used to
determine the list of noise parameters prior to the DEX analysis. This list is generated in an
include file _paramdex.inc which contains the related .PARAMDEX statements.
Preparation of the .PARAMDEX statements involves:
• “Reference Factors for the DEX Analysis” on page 562
• “Defining the Levels of Factors for the DEX Analysis” on page 565
See also “Determining the List of Noise Parameters” on page 570 for more information about
the FIND_FACTOR option.
Note
The .PARAMDEX statement also contains an optional argument [NOISE/ | CTRL/] which
specifies the category of the factor (noise or control). Although Eldo automatically
determines this category, for clarity in the netlist we recommend including this argument within
all .PARAMDEX statements.
Tip
For more detail on .PARAMDEX statements see “.PARAMDEX” in the Eldo Reference
Manual.
See also “Example of Experiment Design” on page 577.
Reference Factors for the DEX Analysis
Selectors are used to identify circuit parameters (noise and control factors) within
.PARAMDEX statements as reference factors.
Tip
See “.PARAMDEX” in the Eldo Reference Manual.
Global Parameter Selector Specification
The P() selector enables global parameters to be referenced.
The syntax of the P() selector is:
562
Eldo® User's Manual, 15.3