Network Analysis (Bathtub Curve)

  1. Select Statistical Eye (Bathtub) for Analysis Type.
  2. Select the net, MUC_HOST_USB+.


    Figure 1.
  3. Click Analyze after changing the Baud Rate (Gbps) to 4 and NoiseRMS to 0.003.
    Please note that if the Statistical Eye simulation has already been completed in the previous case, there is no need to perform the analysis again. So just push again the Display Result button in this dialog.
    After this, Statistical Eye Analysis Result dialog opens.
  4. Clicking on the Bathtub tab located on the right side of the dialog allows the user to set up the Bathtub curve plot.


    Figure 2.
  5. Click on the Measure button, keeping the selection of the Bathtub type to be Horizontal.
  6. Fill in the BER value as 1e-5 and click on the Add button. This will plot the Timing margin (ns) value at the BER of 1e-5 as below.
    The result value is 0.2797 (ns) in this case and it also shows the distance mark at the bathtub curve in the Statistical Eye Analysis Result dialogue.


    Figure 3.
  7. Change the Bathtub type to Vertical and click on the Measure button.
  8. Fill in the BER value as 1e-13 and click on the Add button. This will plot the Voltage margin (V) value at the BER of 1e-13 as below.
    The result value is 0.0372 (V) in this case and it also shows the distance mark at the bathtub curve in the Statistical Eye Analysis Result dialogue.


    Figure 4.