S-Parameter Embedding and De-Embedding Section: Embedding (emulating) or de-
embedding (compensating) the response of actual components or interconnections can
be accomplished by importing S-parameter files in the Touchstone ® v1.1 and v2.0
formats. Files containing information for up to ten ports are supported.
The following controls are available:
Usage: This combo box can be used to choose between embedding (embed)
or de-embedding (deembed) the frequency response data from the imported
S-parameter file.
Cascading F: The cascading factor allows for the emulation of multiple
cascaded identical blocks from the description of a single block. For PCB
traces or cables, this control can be used to simulate the effects of sections of
a different length to the one characterized in the imported file.
Indexes: These two combo boxes allow for the selection of the right parameter
within the S-parameter matrix. It is not possible to select a parameter relative
to a single port so the contents of the two combo boxes cannot be identical. If
available in the imported file, physical information about the selected ports is
shown. For hybrid S-Parameter files, the type of parameter being defined (S
for Single-Ended, C for Common Mode, and D for Differential Mode) and the
associated physical ports is also listed.
File: This button opens a file selection dialog box. Default extensions for files is
“*.s?p” so most standard v1.1 and v2.0 Touchstone ® files will be
automatically shown. If importing the file is successful, the name of the file will
be shown in the text field next to this control and some basic information
about the file is shown in the line over it. This information includes the number
of factors (frequency entries) in the file and the identification information for
the physical ports related to the the selected S-parameter.
De-Emphasis Tab:
The De-Emphasis tab can be used to generate complex emphasis filters. It allows you to
define up to five post-cursor and 5 pre-cursor taps. An interactive graph located at the
bottom of the tab shows the step response corresponding to the defined filter. A
checkbox located at the upper right corner of the tap enables/disables the application
of the de-emphasis filter to the symbol sequence in the waveform and the edition of the
associated controls.
Definitions for tap levels are derived from the N4916B De-emphasis Signal Converter
data sheet (see http://literature.cdn.keysight.com/litweb/pdf/5990-4630EN.pdf).
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