Use this tab to create single lane and multilane bi-level and multi-level high-speed
digital serial signals and clocks. User-defined corrections may be applied to signals to
compensate for (or emulate) instrument, interconnections and interconnect linear
distortions. The serial data tab allows you to generate both data and clock signals. It
directly supports a large variety of channel coding and modulation schemes. This is a
list of the currently supported modulation and channel coding formats:
NRZ (Not Return to Zero).
Unipolar RZ (Return to Zero).
Polar RZ (Return to Zero).
PAM-4 (Pulse-Amplitude Modulation, 4 level)
PAM-5 (Pulse-Amplitude Modulation, 5 level)
PAM-8 (Pulse-Amplitude Modulation, 8 level)
PAM-10 (Pulse-Amplitude Modulation, 10 level)
PAM-12 (Pulse-Amplitude Modulation, 12 level)
PAM-16 (Pulse-Amplitude Modulation, 16 level)
Users can set the bit/signaling rate, basic pulse shape characteristics, and transition
time. Any AWG channel may be selected to generate either a serial signal or a :2 or :4
synchronous clock. A series of standard PRBS sequences with different lengths may be
selected in order to produce realistic traffic and to allow bit-error rate testing with
standard BER testers. Signals may be corrected for cabling and the AWG frequency
response in a channel by channel basis. Additionally, external correction data may be
applied to account for the distortions added by additional cabling, passive or active
system blocks or test fixturing. Channel to channel skew can be also adjusted with
resolutions as low as 100 fs. A variety of Jitter and SSC (Spread Spectrum Clock)
profiles can be added to serial data and clock waveforms. Link characteristics can also
be emulated. Gaussian noise injection, low-pass filtering and S-parameter-based
embedding/de-embedding can be set-up in order to emulate or compensate
interconnections and test fixturings. Finally, a 10-taps (5 pre-cursor and five post-
cursor) de-emphasis filter is available. An Eye Diagram preview display is shown on the
right hand side of the tab. With the help of this Eye diagram display all the physical
characteristics of the output waveform and the effects of all the impairments added to it
can be easily observed and interactively adjusted. The application takes care of
handling the requirements and limits of the target hardware with respect to maximum
and minimum record lengths, sampling rate, and record length granularity. As a result,
generation of the signals designed in this tab will always be feasible by the instrument
and free of distortions such as wrap-around or timing artifacts at any signal domain
(time, frequency, and modulation), even if the signal is generated in looped mode.
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