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Agilent MOI for MHL Cables Compliance Tests

Revision 1.00
Feb-15, 2013

MHL (Mobile High-definition Link) Specification
Version 2.0
Agilent Method of Implementation (MOI) for MHL
Cables Compliance Tests
Using Agilent E5071C ENA Option TDR

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Agilent MOI for MHL Cables Compliance Tests

Table of Contents
1. Revision History ............................................................................................................. 4
2. Purpose ........................................................................................................................... 4
3. References ...................................................................................................................... 4
4. Required Equipments ..................................................................................................... 4
5. Test Procedure ................................................................................................................ 5
5.1. Outline of Test Procedure ......................................................................................... 5
5.2. Instrument Setup ....................................................................................................... 7
5.2.1. Recalling a State File ......................................................................................... 7
5.2.2. Saving a State File ............................................................................................. 8
5.3. Calibration ................................................................................................................ 9
5.3.1. Time Domain Calibration .................................................................................. 9
5.3.2. Frequency Domain Calibration ....................................................................... 12
5.4. Measurement .......................................................................................................... 15
5.4.1. Differential Intra-Pair Skew ............................................................................ 15
5.4.2. Common-mode Intra-Pair Skew ...................................................................... 16
5.4.3. Differential Characteristic Impedance ............................................................. 17
5.4.4. Common-mode Characteristic Impedance ...................................................... 17
5.4.5. CBUS Cable Delay .......................................................................................... 18
5.4.6. Differential Insertion Loss ............................................................................... 19
5.4.7. Common-mode Insertion Loss ........................................................................ 19
5.4.8. Differential to Common-mode Conversion ..................................................... 20
5.4.9. CBUS Insertion Loss ....................................................................................... 21
5.4.10. CBUS Line Capacitance .................................................................................. 21
5.4.11. Far-End Crosstalk ............................................................................................ 23
6. [Appendix] Manual Setup ............................................................................................ 26
6.1. Channel & Trace Setup ........................................................................................... 26
6.2. Differential Intra-Pair Skew ................................................................................... 27

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Agilent MOI for MHL Cables Compliance Tests

6.2.1. Parameter Setup ............................................................................................... 27
6.2.2. Crosstalk Compensation .................................................................................. 28
6.3. Common-Mode Intra-Pair Skew ............................................................................ 29
6.3.1. Parameter Setup ............................................................................................... 29
6.3.2. Crosstalk Compensation .................................................................................. 30
6.4. Differential Characteristic Impedance .................................................................... 30
6.5. Common-Mode Characteristic Impedance ............................................................. 31
6.6. CBUS Cable Delay ................................................................................................. 32
6.7. Common Parameters Setup for Frequency-domain Measurements ....................... 32
6.8. Differential Insertion Loss ...................................................................................... 33
6.9. Common-Mode Insertion Loss ............................................................................... 33
6.10. Differential and Common-mode Conversion ......................................................... 33
6.11. CBUS Insertion Loss .............................................................................................. 34
6.12. Far-End Crosstalk ................................................................................................... 34
6.13. CBUS Line Capacitance ......................................................................................... 34
6.14. Defining Limit Line Tables .................................................................................... 35

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Agilent MOI for MHL Cables Compliance Tests

1. Revision History

Revision Comments Issue Date
1.00 Initial Revision. Feb. 15, 2013

2. Purpose
This test procedure was written to explain how to use the Agilent ENA Option TDR to
make the cable measurements required per MHL (Mobile High-definition Link)
Specification Version 2.0.

3. References
MHL (Mobile High-definition Link) Specification Version 2.0 (Feb. 2012)
MHL (Mobile High-definition Link) Compliance Test Specification Revision 2.0 (Sep.
2012)

4. Required Equipments
1. E5071C ENA Series Network Analyzer
Option 480 or 485 (8.5 GHz) / 4D5 (14 GHz) / 4K5 (20 GHz)
Option TDR (Enhanced time domain analysis)
2. Test Fixture
Wilder Technologies MHL-TPA-R-WOC (Source)
Wilder Technologies MHL-TPA-R-WOSI (Sink)
3. 4-port ECal Module
N4431B (for E5071C-480 or 485)
N4433A (for E5071C-4D5 or 4K5)
4. Coaxial RF cables
5. 50 Ohm terminators (ex. Agilent 909D-301)

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Agilent MOI for MHL Cables Compliance Tests

5. Test Procedure
5.1. Outline of Test Procedure
1. Instrument Setup
Automatic setup by recalling a state file or manual setup.
2. Calibration
ECal Calibration and Fixture Compensation (Time-domain measurements)
ECal Calibration and De-embedding (Frequency-domain measurements)
3. Measurements
4-1. Time-domain Measurements
- Differential Intra Pair Skew
- Common-mode Intra Pair Skew
- Differential Characteristic Impedance
- Common-mode Characteristic Impedance
- CBUS Cable Delay
4-2. Frequency-domain Measurements
- Differential Insertion Loss
- Common-mode Insertion Loss
- Differential to Common-mode Conversion
- CBUS Insertion Loss
- CBUS Line Capacitance
- Far-end Crosstalk

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Agilent MOI for MHL Cables Compliance Tests

Note: Hard Keys (Keys on the E5071C's front panel) are displayed in Blue color and Bold.
(Example: Avg, Analysis)
Note: Soft keys (Keys on the E5071C's screen) are displayed in Bold. (Example: S11, Real,
Transform)
Note: Buttons of the TDR software are displayed in Green color and Bold. (Example: Trace,
Rise Time)
Note: Tabs of the TDR software are displayed in Brown color and Bold. (Example: Setup,
Trace Control)

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Agilent MOI for MHL Cables Compliance Tests

5.2. Instrument Setup
5.2.1. Recalling a State File
This section describes how to recall a state file of the E5071C that includes all the
measurement settings for MHL cable compliance test. The state file can be downloaded at:
www.agilent.com/find/ena-tdr_mhl-cabcon
Copy the state file into the E5071C's directory via USB mass storage device and recall the
state file using the TDR software. Necessary parameters for testing are automatically set up
in the E5071C. Refer to Appendix for the details about manual setup.
If TDR setup wizard is shown, click Close button in the TDR setup wizard main window.

1. Open Setup tab.
2. Click Advanced Mode to show the dialog box.

3. A dialog box appears requesting for confirmation. Then click Yes. (Uncheck "Use
Advanced Calibration Methods")

4. Click File and select Recall State to open the Recall State dialog box.
5. Specify a folder and a file name, and click Open.

The E5071C's channel 1 is used for time-domain measurements by using the TDR software
at the bottom of the E5071C's screen. The channel 2 is used for frequency-domain

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Agilent MOI for MHL Cables Compliance Tests

measurements by using the soft key on the right side of the screen or hard key on the front
panel.

5.2.2. Saving a State File
All the measurement settings including calibration information can be saved in a state file
(*.tdr). After performing calibration, all necessary calibration coefficients are saved in a
state file and can be recalled for the next measurements.

1. Press Save/Recall > Save Type and select State & Cal as a state file type.
2. Click File of the TDR software.

3. Select "Save State".
4. Enter file name and save the state file with calibration information

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Agilent MOI for MHL Cables Compliance Tests

5.3. Calibration
5.3.1. Time Domain Calibration
The purpose of this step is to calibrate the delay and loss of the RF cables (and test fixtures)
by following the wizard of the ENA option TDR software. Full calibration is performed by
using the 4-port ECal Module at the end of RF cables connected to the ENA test ports.
After connecting the test fixture to the cables, the effect of the fixture is removed by the
fixture compensation function of the TDR software. This calibration is applied for
time-domain measurements in Channel 1.

5.3.1.1. ECal Calibration & Fixture Compensation

Calibration for time-domain measurements (except CBUS Line Capacitance) is performed
by the TDR software. The 4-port ECal Module (i.e. N4431B) connected to the E5071C is
necessary for the calibration procedure.

1. Press Channel Next to select Channel 1.
2. Open Setup tab of the TDR software.
3. Click ECal to launch calibration wizard.

4. Connect all test cables to the ECal Module and click Calibrate. Once green check
mark appears, click Next>.

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Agilent MOI for MHL Cables Compliance Tests

5. Disconnect the ECal Module and connect the test fixtures to the RF cables. Click
Fixture Comp to perform fixture compensation. Once green check mark appears, click
Finish to complete the compensation.

6. Connect DUT to the test fixtures.
7. Open Setup tab.
8. Click Auto to launch the diagram.

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Agilent MOI for MHL Cables Compliance Tests

9. Click Measure to specify DUT's electrical length in the dialog box. Once green check
mark appears, click Finish.

10. Read DUT Length and confirm it is over 18 ns. Otherwise input 18 ns in the field.

5.3.1.2. Adjustment of Effective Rise Time
The effective rise time is adjusted for the specification of characteristic impedance
measurements. DUT is disconnected during the adjustment procedure.
1. Open TDR/TDT tab.
2. Click Trace x.
Trace 1 & Trace 7 for Differential Characteristic Impedance.
Trace 2 & Trace 8 for Common-Mode Characteristic Impedance.
3. Click Parameter tab.
4. Select "Time Domain" and "Differential" for Measure.

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Agilent MOI for MHL Cables Compliance Tests

5. Select Format to "Volt".
6. Click Marker Search and select "Rise Time (20

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