Agilent Technologies E5071C Installation and operating manual

Agilent MOI for MHL Cables Compliance Tests
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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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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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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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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 theAgilent 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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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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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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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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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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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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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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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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5. Select Format to “Volt”.
6. Click Marker Search and select “Rise Time (20 –80%)”.
7. Press Run to measure the rise time on the screen.
8. Enter rise time until the measure rise time is close to the specified value.
“200 ps”for Differential Characteristic Impedance.
“600 ps”for Common-Mode Characteristic Impedance.
9. Click Marker Search and select “Rise Time (20 –80%)”to turn off the marker.
10. Select Format to “Impedance”.
5.3.2. Frequency Domain Calibration
The purpose of this step is to calibrate out the RF effects (i.e. mismatch, loss or delay) of
RF cables and test fixtures. Full calibration is performed by using the 4-port ECal Module
at the end of RF cables connected to the ENA test ports. The fixture effect will be
eliminated by de-embedding S-parameters (*.s4p or .s2p) of the fixture. The S-parameter
data is provided by fixture vendors.
The calibration is applied for frequency-domain measurements in channel 2.
5.3.2.1. ECal Calibration
Calibration for the frequency-domain measurement is performed by selecting the ENA’s
soft key. The 4-port ECal Module (i.e. N4431B) connected to the E5071C is necessary for
the calibration procedure.
1. Press Channel Next key to select Channel 2.

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2. Connect all test cables to the ECal Module.
3. Press Calibrate >ECal >4-Port Cal.
5.3.2.2. De-embedding Fixture
The effect of the test fixtures are removed by a de-embedding function of the E5071C’s
firmware. 4-port Touchstone files (*.s4p) are used to compensate differential transmission
lines of the fixtures, while 2-port Touchstone files (*.s2p) are used for compensation of the
single-ended lines.
The following 4-port fixture compensation is applied to 4-port measurements such as
Differential Insertion Loss, Common-Mode Insertion Loss, Differential and
Common-Mode conversion, and Far-End Crosstalk measurements.
1. Press Trace Next to select trace.
2. Press Analysis > Fixture Simulator and turn it ON.
3. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > Select
Topology to select topology C.
4. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > Ports > to
select 1-2-3-4.
5. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > User File
(nwk1) and specify a 4-port de-embedding file (*.s4p) for the Source fixture.
6. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > Type
(nwk1) and select De-embed.
7. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > User File
(nwk2) and specify a de-embedding file (*.s4p) for the Sink fixture.
8. Press Analysis > Fixture Simulator > De-Embedding SnP > Topology > Type
(nwk2) and select De-embed.

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9. Press Analysis > Fixture Simulator > De-Embedding SnP > De-Embedding SnP
and turn it ON.
The following 2-port fixture compensation is applied to CBUS Insertion Loss
measurement.
1. Press Analysis > Fixture Simulator and turn it ON.
2. Press Analysis > Fixture Simulator > De-Embedding > Select Port > 1.
3. Press Analysis > Fixture Simulator > De-Embedding > User File and specify a
2-port de-embedding file (*.s2p) for the Source fixture.
4. Press Analysis > Fixture Simulator > De-Embedding > Select Type to set to User.
5. Press Analysis > Fixture Simulator > De-Embedding > Select Port > 2.
6. Press Analysis > Fixture Simulator > De-Embedding > User File and specify a
2-port de-embedding file (*.s2p) for the Sink fixture.
7. Press Analysis > Fixture Simulator > De-Embedding > Select Type to set to User.
Note that the fixture compensation is not performed for CBUS Line Capacitance
measurement.

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5.4. Measurement
5.4.1. Differential Intra-Pair Skew
1. Connect DUT (Figure 5-1).
Figure 5-1. Differential Intra-Pair Skew Test Setup
Note: Unused fixture pots should be terminated with 50 ohm terminators.
2. Select Trace 3.
3. Press Stop Single.
4. Click Auto Scale and select ”X & Y”for auto scaling the x-axis and y-axis. Record the
transition point of x-axis (in sec).
5. Click the box below the right knob under Horizontal. Set the horizontal value to the
above transition point in a dialog box, so that the transition point can be centered.
6. Select Trace 9 and repeat the same operations, step 4 to 5.
7. Select Trace 3.
8. Click Marker Search and select ΔTime to show the dialog box.
9. Check the ΔTime.
10. Select Target (Stop) to Trace 9 (T42).

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11. Input Position (%) to 50.
12. Click OK.
13. Confirm the measured intra-pair skew is within the limit. If common-mode intra-pair
skew is less than or equal to 43 ps, then PASS. Otherwise FAIL.
5.4.2. Common-mode Intra-Pair Skew
1. Connect DUT (Figure 5-1).
2. Select Trace 4.
3. Press Stop Single.
4. Click Auto Scale and select “X & Y”for auto scaling the x-axis and y-axis. Record the
transition point of x-axis (in sec).
5. Click the box below the right knob under Horizontal. Set the horizontal value to the
above transition point in a dialog box, so that the transition point can be centered.
6. Select Trace 10 and repeat the same operations, step 4 to 5.
7. Select Trace 4.
8. Click Marker Search and select ΔTime to show the dialog box.
9. Check the ΔTime.
10. Select Target (Stop) to Trace 10 (T42).
11. Input Position (%) to 50.
12. Click OK.
13. Confirm the measured intra-pair skew is within the limit. If common-mode intra-pair
skew is less than or equal to 43 ps, then PASS. Otherwise FAIL.

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5.4.3. Differential Characteristic Impedance
1. Connect DUT (Figure 5-1).
2. Select Trace 1.
3. Press Stop Single.
4. Confirm the measured characteristic impedance is within the limit shown in Table 5-1.
5. Select Trace 7 and repeat the same operations of step 2 to 4 for the sink end of the DUT
(Sdd22).
Table 5-1 Differential Characteristic Impedance Limit
Min
Max
Unit
Note
MHL+ and MHL- Differential Impedance
85
115
Ohm
*1
90
110
Ohm
*2
*1. Connection point and transition area, up to 1 ns distance. A single excursion is
permitted out to 65-125 ohms, no wider than 250 ps.
*2. Cable area, from 1 ns to 2 ns distance.
5.4.4. Common-mode Characteristic Impedance
1. Connect DUT (Figure 5-1).
2. Select Trace 2.
3. Press Stop Single.
4. Confirm the measured characteristic impedance is within the limit shown in Table 5-2.
5. Select Trace 8 and repeat the same operations of step 2 to 4 for the sink end of the DUT
(Scc22).
6. Confirm the measured characteristic impedance is within the limit shown in Table 5-2.

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Table 5-2 Common-mode Characteristic Impedance Limit
Min
Max
Unit
Note
MHL Clock Common-mode Impedance
24
36
Ohm
*1
25
35
Ohm
*2
*1. Connection point and transition area, up to 3 ns distance. A single excursion is
permitted out to 20-40 ohms, no wider than 500 ps.
*2. Cable area, from 3 ns to 4 ns distance.
5.4.5. CBUS Cable Delay
1. Connect DUT (Figure 5-2).
2. Select Trace 5.
3. Press Stop Single.
4. Click Auto Scale and select “X”for auto scaling the x-axis.
Figure 5-2. CBUS Cable Delay Test Setup

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5. Press Marker Search > Target > Target Value and enter “0.1”.
6. Confirm the measured CBUS Cable Delay is within the limit. If the delay is less than or
equal to 35 ns, then PASS. Otherwise FAIL.
5.4.6. Differential Insertion Loss
1. Connect DUT (Figure 5-1).
2. Press Channel Next to select Channel 2.
3. Press Trace Next to select Trace 1 (Sdd21).
4. Press Start > and set start frequency to 1 MHz.
5. Press Stop > and set stop frequency to 5.1 GHz.
6. Press Trigger > Single.
7. Confirm the measured differential insertion loss is lower than the limit shown in Table
5-3.
Table 5-3 Differential Insertion Loss Limit
Frequency (MHz)
Attenuation (dB)
0
2.25
825
5.5
2475
12.0
4125
18.0
5100
21.5
5.4.7. Common-mode Insertion Loss
1. Connect DUT (Figure 5-1)
2. Press Trace Next to select Trace 4 (Scc21).
3. Press Start > and set start frequency to 1 MHz.

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4. Press Stop > and set stop frequency to 1.125 GHz.
5. Press Trigger > Single.
6. Confirm the measured common-mode insertion loss is lower than the limit shown in
Table 5-4.
Table 5-4 Common-Mode Insertion Loss Limit
Frequency (MHz)
Attenuation (dB)
0
0.5
25
1.5
125
3.0
375
5.5
1125
12.0
5.4.8. Differential to Common-mode Conversion
1. Connect DUT (Figure 5-1).
2. Press Trace Next to select Trace 2 (Sdc21).
3. Press Start > and set start frequency to 1 MHz.
4. Press Stop > and set stop frequency to 5.1 GHz.
5. Press Trigger > Single.
6. Confirm the measured differential to common-mode conversion is lower than the limit
shown in Table 5-5.
Table 5-5 CBUS Line Capacitance Limit
Frequency (MHz)
Attenuation (dB)
0 to 300
-35
>300 to 675
-25
>675 to 1500
-20
>1500 to 5100
-15