eldo_user

Statistical Experimental Design and Analysis
Determining the List of Noise Parameters
Defining Levels With Respect to the Nominal Value
This option enables you to specify the levels for noise or control parameters with respect to the
nominal value x nom . The low levels x low and high levels x high can be defined using the following
syntax:
* NOISE FACTORS
.PARAMDEX FACTOR_NAME [NOISE/] ABS=DELTA
.PARAMDEX FACTOR_NAME [NOISE/] REL=DELTA%
* CONTROL FACTORS
.PARAMDEX FACTOR_NAME [CTRL/] ABS=DELTA [NOM=RVALUE]
.PARAMDEX FACTOR_NAME [CTRL/] REL=DELTA% [NOM=RVALUE]
The ABS=DELTA argument is used to specify an absolute perturbation of the nominal value
x nom giving a low level of x low = x nom − Δ and a high level of x high = x nom − Δ for each factor.
The REL=DELTA% argument is used to specify a relative perturbation of the nominal value
x nom giving a low level of x low = (1− Δ)·x nom and a high level of x high = (1+ Δ)·x nom for each
factor.
With control factors, you can also specify the nominal value x nom using the argument
NOM=RVALUE. For example:
.PARAMDEX
+ WIN_GLOB CTRL/REL=10% NOM=40U
Tip
See “.PARAMDEX” in the Eldo Reference Manual.
Related Topics
Defining the Levels of Factors for the DEX Analysis
Determining the List of Noise Parameters
Determining the List of Noise Parameters
This example shows how to use the FIND_FACTOR option in the .DEX command to determine
the list of noise parameters prior to any DEX analysis. This list is then used to prepare the
.PARAMDEX statements. Two output files are produced: a .dex file containing formatted data,
and an include file, _paramdex.inc, containing the related .PARAMDEX commands.
Consider the following netlist (from the example filter.cir available in the directory
$MGC_AMS_HOME/examples/dex/):
570
Eldo® User's Manual, 15.3