eldo_user

Specifying Simulation Output
.EXTRACT Command
.EXTRACT Command
The most frequent usage is for simple extraction of a waveform value, with the following
general form:
Syntax
.EXTRACT function(wave, condition, [min, max])
Parameters
• function
User supplied function that can be any of the built-in functions, or a user-defined function.
Some built-in functions:
o
o
o
Yval returns the value of an abscissa (Y-coordinate) corresponding to a given
ordinate (X-value).
Xyvalue returns the ordinate (X-Value) for which the abscissa (Y-value) satisfies a
given condition.
Xup gives the value of X when Y crosses a threshold in the upward direction, and so
on for other functions.
• wave
Name of the waveform to which the function is applied. The wave can be any usual Eldo
output, or a user-defined quantity supplied as a function of Eldo outputs.
• condition
Specifies a condition to be satisfied for the application of the .EXTRACT command. It can
be expressed using any of the Eldo operators, including any legal mathematical expression.
• min, max
A pair of values defining the start and end of the range over which the .EXTRACT
command applies. Specifying a min point higher than the max point is allowed, the analysis
will proceed backwards from max to min. This can be useful in tracking the last occurrence
of a given event.
If MIN and MAX are not specified in a function call, information is returned when the
CONDITION is true for the first time.
The x-axis values MIN and MAX may be replaced by the keywords START and END to
specify the beginning and end of the simulation interval respectively. The x-axis value MIN
may be made greater than the MAX value. This causes Eldo to look backwards when
CONDITION is true for the first time. This is useful for extracting waveform settling time
data.
An alternative to the .EXTRACT command is the .MEAS command, which provides
compatibility with the HSPICE simulator.
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Eldo® User's Manual, 15.3