A basic question: How to using eyeDiagramSI function?

How to using eyeDiagramSI function to plot a eyedigram for 10Gbps@PRBS15 singal of BIN format?

Refer to below code, seems not working.

samplesPerSymbol = 16;

symbolTime = 100e-12;

sampleInterval = symbolTime / samplesPerSymbol;

modulation = 2;

eyeDiagram = eyeDiagramSI;

eyeDiagram.SampleInterval = sampleInterval;

eyeDiagram.SymbolTime = symbolTime;

eyeDiagram.Modulation = modulation;

[KALYAN ACHARJYA]

eyeDiagramSI is not a built-in MATLAB function?

[石平]

I think yes, eyeDiagramSI function come from like SerDes Toolbox, or Signal Integrity Toolbox.

Answer 1

[Avni Agrawal]

Hi @石平,

I understand that you are trying to plot an eye diagram for a 10 Gbps PRBS15 signal using the `eyeDiagramSI` function in MATLAB, you need to ensure that you have the required toolboxes and that your setup is correct.

Required Toolbox: Signal Integrity Toolbox

• The `eyeDiagramSI` function is part of this toolbox.

Steps to Plot the Eye Diagram

1. Ensure Toolboxes are Installed: Verify that the Signal Integrity Toolbox is installed. You can check this in MATLAB using the `ver` command.
2. Set Up the Eye Diagram: Define the parameters for your signal. Ensure that the parameters match your signal's characteristics.
3. Use the `eyeDiagramSI` System Object: Create and configure the `eyeDiagramSI` object with the appropriate properties.

Here is a corrected version of the code:

% Define parameters
samplesPerSymbol = 16; % Number of samples per symbol
symbolTime = 100e-12;  % Symbol time for 10 Gbps
sampleInterval = symbolTime / samplesPerSymbol; % Sample interval
modulation = 2; % Binary modulation

% Create the eye diagram object
eyeDiagram = eyeDiagramSI('SampleInterval', sampleInterval, ...
    'SymbolTime', symbolTime, ...
    'Modulation', modulation);

% Generate a PRBS15 signal (example)
prbs15Signal = prbs(15, 'Order', samplesPerSymbol * 1000); % Adjust length as needed

% Plot the eye diagram
step(eyeDiagram, prbs15Signal);

Additional Notes

• PRBS Signal: Ensure correct generation, possibly using the `prbs` function from the Communications Toolbox.
• Syntax: Verify correct usage of the `eyeDiagramSI` object.
• Documentation: See the Eye Diagram System Object Documentation: https://www.mathworks.com/help/signal-integrity/ref/eyediagramsi-system-object.html for details.

If you encounter issues, make sure to check for errors in the MATLAB command window and ensure all necessary toolboxes are installed and licensed.

I hope this helps!

[石平]

Thanks for your kindly comment,

and about prbs15 pattern, I captured waveform from keysight oscilloscope and saved as BIN file.

Using eyeDiagramSI function, it cannot recovery a eye diagram, do you have some similar experience for that?

[世杰]

the same

[石平]

You encounter same issue with me?