HP E5071C schematic

Agilent Technologies

VESA DisplayPort Cable &
Connector Compliance Test

Test Solution Overview Using
the Agilent E5071C ENA

Option TDR

Last Update 2013/2/18 (TH)

Purpose

• This slide will show how to make measurements of VESA
DisplayPort Cable & Connector Compliance Tests by using the Agilent

E5071C ENA Option TDR.

2

Agilent Digital Standards Program

Our solutions are driven and supported by Agilent

experts involved in international standards committees:

• Joint Electronic Devices Engineering Council (JEDEC)

• PCI Special Interest Group (PCI-SIG®)

• Video Electronics Standards Association (VESA)

• Serial ATA International Organization (SATA-IO)

• USB-Implementers Forum (USB-IF)

• Mobile Industry Processor Interface (MIPI) Alliance

• Optical Internetworking Forum (OIF)

We’re active in standards meetings, workshops, plugfests,

and seminars

Our customers test with highest confidence and achieve

compliance faster

3

DisplayPort – Agilent Total Solution Coverage

HDMI and DisplayPort Design and Test - A Better Way
(http://cp.literature.agilent.com/litweb/pdf/5990-8001EN.pdf)

4

Reference Document

• VESA DisplayPort Standard Version 1, Revision 2a

• VESA Display Port PHY Compliance Test Specification Version

1.2b

5

DisplayPort Cable and Connector Compliance Test Solution

PHY Layer Test Points

Source CabCon

2

ML Pair

Full Simplex

Content Display

ML Lanes

= 1, 2 or 4

2

AUX Pair

Half-Duplex

PWR (1), GND (1)

Sink

Link Layer/Protocol Test and Control Points

6

DisplayPort PHY Compliance Test Solution

Measurement Parameters

Source CabCon

2

ML Pair

Full Simplex

ML Lanes

= 1, 2 or 4

2

AUX Pair

Half-Duplex

Sink

Time Domain Measurements

Bulk Cable and Connector Impedance (Normative)
Intra-Pair Skew (Normative)
Inter-Pair Skew (Normative)

Frequency Domain Measurements

Insertion Loss (Normative)
Return Loss (Normative)

Near End Noise (*)

Far End Noise (Normative)

* Near End Noise (NEN): Normative for AUX Channel, Main Link(0) and Main

Link(3) and Informative for the rest of the Main Link Channels.

7

DisplayPort PHY Compliance Test Solution

Solution Overview

•DisplayPort cable & connector compliance testing requires parametric

measurements in both time and frequency domains

Traditional

Frequency Domain

•Insertion Loss

•Return Loss

•Near End Noise

•Far End Noise

Time Domain

•Bulk Cable and
Connector Impedance

•Intra Pair Skew

•Inter Pair Skew

Solution

Vector

Network

Analyzer

(VNA)

TDR

Scope

New Solution

•ALL parameters can
be measured with

ENA Option TDR

One-box

Solution !!

8

DisplayPort PHY Compliance Test Solution

Authorized Test Centers (ATC) Supporting ENA Option TDR

ENA option TDR is used by authorized test centers (ATC) to perform
DisplayPort cable assemblies compliance tests.

VESA DisplayPort - Authorized Test Centers (ATC)

http://www.vesa.org/displayport-developer/compliance/

9

DisplayPort PHY Compliance Test Solution

ENA Option TDR Solution

•ENA Mainframe

•E5071C-4D5: 4-port, 300kHz to 14GHz

•E5071C-4K5: 4-port, 300kHz 20GHz

•Enhanced Time Domain Analysis

Option (E5071C-TDR)

•ECal Module

•N4433A for E5071C-4D5/4K5

•Method of Implementation (MOI)

document available for download on
Agilent.com

•State files (4D5, 4K5) and cal kit
definition file for official cal fixtures

are also available

MOI

(Method of Implementation)

Step-by-step procedure on
how to measure the specified
parameters in the specification
document using ENA Option
TDR.

ENA Option TDR is a certified

solution for cable PHY.

http://www.vesa.org/displayport­developer/certified-components/

DisplayPort Test Fixture

Fixtures for testing
DisplayPort cable

assemblies and connectors

are available for purchase
through BitifEye.

http://bitifeye.com/

www.agilent.com/find/ena-tdr_compliance

www.agilent.com/find/ena-tdr_dp-cabcon

10

DisplayPort PHY Compliance Test Solution

Measurement Parameters

Time Domain

Impedance

(Tdd11, Tdd22)

Inter Pair

Skew

(Tdd21, Tdd21)

Intra Pair

Skew

(Tdd31, Tdd42)

Inter Pair

Skew

(Tdd21, Tdd21)

Frequency Domain

Far End

Noise (FEN)

(Sdd21)

Insertion

Loss

(Sdd21)

Return Loss

(Sdd11, Sdd21)

Near End

Noise (NEN)

(Sdd21)

11

DisplayPort PHY Compliance Test Solution

Bulk Cable and Connector Impedance

•Multiple reflections from impedance mismatches
cause noise at the receiver. Therefore, the impedance

profile provides an indication of multiple reflection

induced noise

•Impedance is the most used parameter, but is an
indirect measure of the signal arriving at the receiver

Source CabCon

2

ML Pair

Full Simplex

Sink

Tdd11 Tdd22

12

ML Lanes =

1, 2 or 4

2

AUX Pair

Half-Duplex

Impedance Profile Measurement Impedance Limit Example (for Standard DP cable)

DisplayPort PHY Compliance Test Solution

Intra-Pair Skew

•Ensures the signal of differential pairs of main link and
AUX of a cable assembly arrive at the receiver at the

same time.

•Excessive Intra-pair skew can distort the rising edge
of the signal, lead to significant differential to common
mode conversion.

Source CabCon

2

ML Pair

Tdd31, Tdd42

Full Simplex

ML Lanes =

1, 2 or 4

Sink

•Intra-pair skew must be no more than:

• 50 ps (for HBR Cables)

• 10 ps (for HBR Resizing Adaptors)

• 35 ps (for HBR Extension Cables)

13

• 250 ps (for RBR)

2

AUX Pair

Half-Duplex

DisplayPort PHY Compliance Test Solution

Inter-Pair Skew

•Ensures the signal between two differential pairs of a
cable assembly arrive at the receiver at the same time

(to avoid logic errors within the systems)

•Inter-Pair skew results from electrical length difference
between channels.

Source CabCon Sink

2

•Inter-pair skew must be no more than:

ML Pair

Full Simplex

ML Lanes =

1, 2 or 4

Tdd31, Tdd42

2

Note: UI (Unit Interval) is the reciprocal of the bit rate. At 5.4 Gbps, the UI = 185

ps. At 2.7 Gbps, the UI = 370.4 ps. At 1.62 Gbps, the UI = 617 ps.

• 2 UI (for HBR Cables)

• 0.2 UI (for HBR Resizing Adaptors)

• 1 UI (for HBR Extension Cables)

• 2 UI (for RBR Cables)

14

AUX Pair

Half-Duplex

DisplayPort PHY Compliance Test Solution

Far End Noise (FEN)

•Far End Noise (FEN) is the magnitude of the coupled

noise from a driven “aggressor” channel(s) at the
source side on to a quiet “victim” channel at the sink

side.

•The FEN from all aggressors are measured

Source CabCon Sink

2

2

Far End Noise

ML Pair

(FEN)

Full Simplex

ML Lanes =

1, 2 or 4

2

AUX Pair

Half-Duplex

individually, the results will be added together as a
power sum to derive the total aggressor combination.

Where FENn(f) is the far-end noise in dB, IL(f) is the
victim lane insertion loss in dB

15

DisplayPort PHY Compliance Test Solution

Return Loss (RL/Sdd11)

•Return loss is the ratio of the incident and reflected
power of differential pairs.

•Return loss originate at impedance discontinuities and
reflected signals can affect the rising edge of the signal.

0

Source CabCon

2

ML Pair

Full Simplex

Sdd11 Sdd22

ML Lanes =

1, 2 or 4

2

AUX Pair

Half-Duplex

Sink

-5

-10

-15

-20

(Sdd11, dB)

-25

Differential Return Loss

-30
1000

2000 3000

4000

5000

6000

7000

8000

9000

Frequency (MHz)

Differential Return Loss Requirement for HBR Cable Assembly

16

DisplayPort PHY Compliance Test Solution

Insertion Loss (IL/Sdd21)

•Insertion loss is the sink to source loss through the
differential pairs.

•Has important consequences for the rise time
degradation and the maximum supportable bandwidth.

Source CabCon

2

ML Pair

Full Simplex

Sdd21

ML Lanes =

1, 2 or 4

2

AUX Pair

Half-Duplex

Sink

Differential Insertion Loss Requirement for HBR Cable Assembly

17

DisplayPort PHY Compliance Test Solution

Near End Noise (NEN)

•Near End Noise (FEN) is the magnitude of the

coupled noise from a driven “aggressor” channel at the
source side on to a quiet “victim” channel at the source

side.

Source CabCon Sink

2

ML Pair

Full Simplex

ML Lanes =

1, 2 or 4

2

Near End

AUX Pair

Noise (NEN)

Half-Duplex

0

-5

-10

-15

-20

-25

-30

Near End Noise (dB)

-35

-40
1

Frequency (GHz)

Near-End Noise Requirement for HBR Cable Assembly

10

18

ENA Option TDR Compliance

One-box Solution for TDR/S-parameter Compliance Test

Certified MOIs

•Cable/Connector

Time

&

Frequency

Time

&

Frequency

Time

&

Frequency

Frequency

Time

&

Frequency

•Transmitter/Receiver (Hot TDR)

Test Centers Support ENA Option TDR

ENA Option TDR is used world wide by

certified test centers of USB, HDMI,

DisplayPort, and SATA

More Standards

Time

&

Frequency

For more detail about compliance test solution by the ENA Option TDR, visit www.agilent.com/find/ena-tdr_compliance

19

Time

&

Frequency

Currently Under

Investigation

DisplayPort PHY Compliance Test Solution

Summary

ENA Option TDR Cable/Connector Compliance Testing Solution is ….

•One-box solution which provides complete characterization of high speed digital

interconnects (time domain, frequency domain, eye diagram)

•Similar look-and-feel to traditional TDR scopes, providing simple and intuitive

operation even for users unfamiliar to VNAs and S-parameters

•Adopted by test labs worldwide

20

21

Questions?

Agilent VNA Solutions

E5071C

World’s most popular
economy VNA

9 kHz to 4.5, 8.5 GHz

E5061B

NA + ZA in one-box

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Handheld RF
Analyzer
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300 kHz to 6, 13.5, 20 GHz
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Mm-wave
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Up to 2 THz

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receiver

8530A replacement

PNA Series

22

What is ENA Option TDR?

The ENA Option TDR is an application software embedded on the
ENA, which provides an one-box solution for high speed serial
interconnect analysis.

Frequency Domain Time Domain

Eye Diagram

3 Breakthroughs

for Signal Integrity Design and Verification

Simple and Intuitive Operation

Fast and Accurate Measurements

ESD Robustness

ESD protection inside

23

What is ENA Option TDR?

[Video]

Agilent ENA Option TDR

Changing the world of Time Domain Reflectometry (TDR) Measurements

•www.youtube.com/watch?v=hwQNlyyJ5hI&list=UUAJAjd97CfnCehC4jZAfkxQ&index=20&feature=plcp

•www.agilent.com/find/ena-tdr

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Additional Resources

•ENA Option TDR Reference Material

www.agilent.com/find/ena-tdr

•Technical Overview (5990-5237EN)

•Application Notes

•Correlation between TDR oscilloscope and VNA generated time domain waveform (5990-5238EN)

•Comparison of Measurement Performance between Vector Network Analyzer and TDR

Oscilloscope (5990-5446EN)

•Effective Hot TDR Measurements of Active Devices Using ENA Option TDR (5990-9676EN)

•Measurement Uncertainty of VNA Based TDR/TDT Measurement (5990-8406EN)

•Accuracy Verification of Agilent’s ENA Option TDR Time Domain Measurement using a NIST

Traceable Standard (5990-5728EN)

•Method of Implementation (MOI) for High Speed Digital Standards

www.agilent.com/find/ena-tdr_compliance

25

Measurement Correlation

TDR/TDT

•DUT: DisplayPort Cable

•130 ps rise time (20-80%)

26

Measurement Correlation

Eye Diagram

•DUT: DisplayPort Cable

•PRBS (2^7-1) @ 2.7 Gbps

ENA Option TDR

(simulated)

N4903B + 86100C

(live)

27