Calibrated Stressed Eye Stimulus&

Accurate Jitter Analysis

Pascal GrisonDigital Design Application Engineer

Rev 03.12.2007

Realtime Scope JitterMeasurement Floor

Jitter Measurement Floor is dependant on several factors:

-Scope Vertical Noise Floor-Scope Sampling Rate Linearity-Signal Slew-rate-Probe Noise refer to input

Validating Real-Time Oscilloscope Jitter Breakdown algorythms

In order to Validate Jitter Breakdown, we need a clean Pulse Pattern Signal Generator that will allowdifferent types of calibrated Jitter Injection. The generator Choosen will be N4903A JBERT

Jitter Breakdown analysis will be conductedWith:86100C + 54754A 18GHz Sampling OscilloscopeDSO81204B 12GHz 40GS/s RT OscilloscopeTEK DSA71254A 12GHz 50GSa/s RT Oscilloscope

J-BERT: The High-Performance Serial BERT for Complete Jitter Tolerance Testing

•• CalibratedCalibrated jitter composition

•• AutomatedAutomated jitter characterisation

•• TunableTunable and standard-conform• Clock Data Recovery•• Compliant Compliant to latest serial bus • standards

•• IntegratedIntegrated all in one BOX

SSmmaarrtteesstt Characterisation

Covered standards include:• PCI Express ®• 10 GbE/XAUI• Fibre Channel

• FB-DIMM• XFI/XFP• SATA

N4903A JBERT1Gb/s-12.5Gb/s Pulse Pattern GeneratorEmbedded Jitter Sources:Calibrated RJ/PJ/BUJ/SSCEmbedded Calibrated ISI ChannelsEmbedded Flexible Clock Data RecoveryEmbedded Error Detector for BER Meas.12dB De-Emphasis Capability with N4916A

Let’s setup Virgin 5Gb/s PRBS

Lets Measure JBERT Golden 5Gb/s PRBSwith 86100C 18GHz BW

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:338fs RMSPJ:240fs p-pISI: 4.6ps p-p

Lets Measure JBERT Golden 5Gb/s PRBSon 12GHz DSO80000B

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:580fs RMSPJ:890fs p-pISI: 5.32ps p-p

Lets Measure JBERT Golden 5Gb/s PRBSon 12GHz DSA71254 & TDSJIT3

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:503fs RMSPJ:3.10ps p-pISI: 3.23ps p-p

ISI Underestimated

PJ Overestimated

Now let’s inject no RJ butCalibrated PJ 2ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:474fs RMSPJ:2.41ps p-pISI: 5.72ps p-p

JBERT 5Gb/S PJ 2ps Peak to PeakMeasured on 86100C & 18GHz BW

JBERT No RJ InsertionPJ Stimulus of 2ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/sPJ 2ps p-p

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:660fs RMSPJ:2.75ps p-pISI: 7.74ps p-p

Now let’s injectCalibrated PJ 4ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:479fs RMSPJ:4.42ps p-pISI: 5.74ps p-p

JBERT 5Gb/S PJ 4ps Peak to PeakMeasured on 86100C 18GHz BW

JBERT No RJ InsertionPJ Stimulus of 4ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:660fs RMSPJ:4.14ps p-pISI: 6.48ps p-p

Lets Measure JBERT 4ps PJ 5Gb/s PRBSon 12GHz DSA71254 & TDSJIT3

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:590fs RMSPJ:7.96ps p-pISI: 2.98ps p-p

PJ 2X Overestimated

Now let’s injectCalibrated PJ 6ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:550fs RMSPJ:6.5ps p-pISI: 5.7ps p-p

JBERT 5Gb/S PJ 6ps Peak to PeakMeasured on 86100C 18GHz BW

JBERT No RJ InsertionPJ Stimulus of 6ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:650fs RMSPJ:6.48ps p-pISI: 6.38ps p-p

Lets Measure JBERT 6ps PJ 5Gb/s PRBSon 12GHz DSA71254 & TDSJIT3

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:596fs RMSPJ:12.2ps p-pISI: 2.73ps p-p

PJ 2X Overestimated

Now let’s injectCalibrated PJ 8ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:590fs RMSPJ:8.5ps p-pISI: 5.6ps p-p

JBERT 5Gb/S PJ 8ps Peak to PeakMeasured on 86100C 18GHz BW

JBERT No RJ InsertionPJ Stimulus of 8ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:640fs RMSPJ:8.38ps p-pISI: 6.40ps p-p

Lets Measure JBERT 8ps PJ 5Gb/s PRBSon 12GHz DSA71254 & TDSJIT3

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:601fs RMSPJ:13.9ps p-pISI: 2.72ps p-p

PJ 50% Overestimated

Now let’s injectCalibrated PJ 10ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

Jitter AnalysisRJ:660fs RMSPJ:10.4ps p-pISI: 7ps p-p

JBERT 5Gb/S PJ 10ps Peak to PeakMeasured on 86100C 18GHz BW

JBERT No RJ InsertionPJ Stimulus of 10ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:690fs RMSPJ:10.07ps p-pISI: 6.44ps p-p

Lets Measure JBERT 10ps PJ 5Gb/s PRBSon 12GHz DSA71254 & TDSJIT3

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:604fs RMSPJ:16.5ps p-pISI: 2.89ps p-p

PJ 60% Overestimated

Now let’s injectCalibrated Random Jitter 2ps RMS

Lets Measure JBERT 5Gb/s PRBS with 2ps RMS RJwith 12GHz DSO80000B

Test Conditions:

JBERT

PRBS 2e10-1

5Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/sConst. Freq. Clock

Jitter AnalysisRJ:1.98ps RMSPJ:1.36ps p-pISI: 6.84ps p-p

Now let’s injectCalibrated Random Jitter 4ps RMS

Test Conditions:

JBERTPRBS 2e10-15Gb/s

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:3.70ps RMSPJ:1.81ps p-pISI: 7.18ps p-p

Lets Measure JBERT 5Gb/s PRBS with 4ps RMS RJwith 12GHz DSO80000B

Now let’s injectCalibrated Random Jitter 6ps RMS

Test Conditions:

JBERTPRBS 2e10-15Gb/sRJ insertion:6ps RMS

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:5.72ps RMSPJ:3.88ps p-pISI: 7.68ps p-p

Lets Measure JBERT 5Gb/s PRBS with 6ps RMS RJwith 12GHz DSO80000B

Now let’s injectCalibrated Random Jitter 2ps RMS

& Calibrated PJ 2ps peak-peak

JBERT 5Gb/S RJ 2ps RMS + PJ 2ps Peak to PeakMeasured on 12GHz DSO80000B

Test Conditions:

JBERTPRBS 2e10-15Gb/sRJ 2ps RMSPJ 2ps p-p

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:2.01ps RMSPJ:1.62ps p-pISI: 6.34ps p-p

Now let’s injectCalibrated Random Jitter 2ps RMS

& Calibrated PJ 4ps peak-peak

Test Conditions:

JBERTPRBS 2e10-15Gb/sRJ 2ps RMSPJ 4ps p-p

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:2ps RMSPJ:3.23ps p-pISI: 6.50ps p-p

JBERT 5Gb/S RJ 2ps RMS + PJ 4ps Peak to PeakMeasured on 12GHz DSO80000B

Now let’s injectCalibrated Random Jitter 2ps RMS

& Calibrated PJ 6ps peak-peak

JBERT RJ Stimulus of 2ps RMPJ Stimulus of 6ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/sRJ 2ps RMSPJ 6ps p-p

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:1.97ps RMSPJ:5.71ps p-pISI: 6.67ps p-p

Now let’s injectCalibrated Random Jitter 2ps RMS& Calibrated PJ 10ps peak-peak

JBERT RJ Stimulus of 2ps RMPJ Stimulus of 10ps Peak to Peak

Test Conditions:

JBERTPRBS 2e10-15Gb/sRJ 2ps RMSPJ 10ps p-p

Direct CableConnection

DSO81204B12GHz 40GS/s

Jitter AnalysisRJ:2.04ps RMSPJ:9.07ps p-pISI: 6.98ps p-p

Summary of PJ Stimulation Results

JBERT DCA-J DSO81204B TEK DSA71254Jbert Virgin5Gb/s PRBS

RJ:0PJ:0ISI:0

RJ 338fs RMSPJ 240fs p-pISI 4.60 p-p

RJ 580fs RMSPJ 890fs p-pISI 5.32 p-p

RJ 503fs RMSPJ 3.10ps p-pISI 3.23 p-p

Pure PJ 2ps p-p

RJ 474fs RMSPJ 2.41ps p-pISI 5.72 p-p

RJ 660fs RMSPJ 2.75ps p-pISI 7.74 p-p Picture corrupted

Pure PJ 4ps p-p

RJ 479fs RMSPJ 4.42ps p-pISI 5.74 p-p

RJ 660fs RMSPJ 4.14ps p-pISI 6.48 p-p

RJ 590fs RMSPJ 7.96ps p-pISI 2.98 p-p

Pure PJ 6ps p-p

RJ 550fs RMSPJ 6.5ps p-pISI 5.7 p-p

RJ 650fs RMSPJ 6.48ps p-pISI 6.38 p-p

RJ 596fs RMSPJ 12.2ps p-pISI 2.73 p-p

Pure PJ 8ps p-p

RJ 590fs RMSPJ 8.5ps p-pISI 5.6 p-p

RJ 640fs RMSPJ 8.38ps p-pISI 6.4 p-p

RJ 601fs RMSPJ 13.9ps p-pISI 2.72 p-p

Pure PJ 10ps p-p

RJ 660fs RMSPJ 10.4ps p-pISI 7 p-p

RJ 690fs RMSPJ 10.1ps p-pISI 6.44 p-p

RJ 604fs RMSPJ 16.5ps p-pISI 2.89 p-p