23
Statistics
To enable repetitive data acquisition, and statistics measurements, the repetitive mode needs
to be checked or the numbers of acquisition in the counter box needs to be increased, then
the statistical measurements are shown and the following is displayed: Current value, average
minimum, maximum and the standard deviation of each measurement.
Filters
The DSO GUI platform comes equipped with useful filters that offer a variety of signal processing
techniques including cleaning the signal, de-embedding and discovering the optimal taps for
improving an NRZ or PAM4 signal. The filtering GUI can be used to adaptively detect the minimum
number of FFE or DFE taps required to reach a target Eye Height or SNR.
These filters can be applied to a DUT signal with or without introducing the
preserve noise
feature,
which compensates for the filter side effect of reducing signal noise of adjacent measurement
points. Please see
Appendix V
for more information regarding the preserve noise feature.
Click on the Filters button after a successful signal acquisition.
Figure 15: PAM4 pattern mode
Current List of Supported Filters:
1-
Moving Average Filter for signal smoothing: User can specify window size.
2-
4
th
Order Bessel Thomson filter at frequency equal to 0.75 of the bit rate (order and
cutoff are configurable).
3-
CTLE filter: User can automatically or manually select the filter parameters. Adaptive
CTLE can determine the CTLE for best Eye Height.
4-
S2P/S4P De-Embedding: This filter simulates the inverse of a channel or DUT, where
the channel’s S2P or S4P file is loaded. Can also emulate channel insertion loss.
