198 Keysight M8000 Series of BER Test Solutions User Guide
4 User Interface - M8020A Display Views
Adjustable Intersymbol Interference
The M8070A system software provides integrated and adjustable
Intersymbol Interference (ISI) capability to test next-generation
high-speed digital designs.
The adjustable and programmable ISI function allows emulating channel
loss for characterizing and compliance testing of high-speed digital
receivers. This function is integrated in each pattern generator channel of
the M8020A/M8030A which streamlines test setup by eliminating the need
for external cabling and switching of external ISI traces.
As data rates continuously increase, channel loss between transmitter and
receiver becomes more important. Channel loss is caused by printed
circuit board traces, connectors, and cables in the signal path; resulting in
ISI which depends on the channel material and dimensions, the data rate,
and bit pattern. All high-speed digital receivers are specified to tolerate a
certain amount of total jitter, which typically includes some ISI caused by
channel loss. During receiver characterization and compliance test, this
loss needs to be emulated.
The built-in ISI functionality is programmable for each pattern generator
channel. It simplifies receiver test automation for data rates up to 16 Gb/s.
The new adjustable ISI option offers the following advantages:
• Streamlines receiver test setup by providing the highest level of
integration.
• Provides accurate and repeatable results for receiver characterization
and compliance test by supporting a wide range of loss up to 25 dB
and 16 GHz with linear loss curves and fine step resolution.
• Fits into the fully scalable and upgradeable receiver test solution with
an upgrade option.
Using System View for ISI Configuration
You can use the System View to configure the ISI parameters for a
selected ‘Data Out’ location. When you select ISI in the Jitter block of the
System View, the corresponding parameters are loaded on the
Parameters window. You can create your own preset or manipulate
frequency and insertion loss for the selected preset.
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