hdmi2.1 source test procedure

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HDMI2.1 Source Test Procedure Test ID: HF1-9 Using Keysight E5080B ENA with

Enhanced TDR App

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Table of Contents

1. Revision History ................................................................................................................................... 3

2.Introduction........................................................................................................................................... 3

3.Required Equipment ............................................................................................................................. 3

4.Test Flow Chart .................................................................................................................................... 4

5.Instrument Setup .................................................................................................................................. 5

5.1 Recalling a State File ............................................................................................................ 5

5.2 Saving a State File ................................................................................................................ 6

5.3 Calibration ............................................................................................................................. 7

5.3.1 ECal Calibration & Fixture Compensation............................................................... 7

5.3.2 DUT Length Measurement ..................................................................................... 8

5.3.3 Adjustment of Effective Rise Time .......................................................................... 9

6.Measurement and Data Analysis ........................................................................................................ 11

6.1 Differential Impedance......................................................................................................... 11

6.2 Differential Return Loss (Informative)................................................................................... 18

7.[Appendix] Manual Setup .................................................................................................................... 19

7.1 Launch TDR Class .............................................................................................................. 19

7.2 Channel & Trace Setup ....................................................................................................... 19

7.3 Differential Impedance ......................................................................................................... 20

7.4 Differential Return Loss ....................................................................................................... 20

Web Resources ..................................................................................................................................... 21

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1. Revision History

Revision Comments Date

1.0 Initial revision 3-Sep-2020

2. Introduction

This document provides testing procedures for HDMI CTS 2.1 Test ID HF1-9: “Source TMDS Electrical –

Differential Impedance.” HDMI Forum created HDMI CTS 2.1 to specify a set of tests that should be

performed to verify features described in HDMI Specification Version 2.1. The Method of Implementation

for the test using the Keysight E5071C ENA is available on HDMI Form web site at

http://www.hdmiforum.org/.

This document complements the test procedure using the E5080B ENA (Successor of E5071C).

3. Required Equipment

Description Test Equipment Qty

Network Analyzer Keysight E5080B ENA Series Network Analyzer:

• Option 2x0/4x0/4x2 (Select one test set option

of 9, 14 or 20 GHz)

• Option 120 or 140 (Internal bias tee options for

2-port or 4-port E5080B up to 20 GHz)

• Option 175 (Analog input and output ports)

1 ea.

Software S96011A/B Enhanced time-domain analysis with TDR 1 ea.

ECal or Mechanical

Cal Kit

Keysight N4431D (for E5080B 9 GHz options) or

N4433D (for E5080B 14 / 20 GHz options)

1 ea.

Adapter 3.5 mm (f) to Type-N (m) (ex. Keysight 1250-

1744) for E5080B with type-N connectors or

83059B coaxial adapter for E5080B with 3.5-

mm connectors.

2 ea.

RF cable 3.5 mm or SMA cables of 9 GHz bandwidth or more. 2 ea.

Power

Supply

To provide pull-up DC voltage (+3.3 V) for TMDS

lines.

1 ea.

Source TPA-P BitifEye BIT-1010-0200-0 HDMI 2.0 Type A

Source Test Adapter Kit or

BIT-1010-0225-1, HDMI 2.0 Type A with

HEAC Plug Test Point Adapter, with 12 inch

SMA cables or

1 ea.

http://www.hdmiforum.org/

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BIT-1010-0240-1, HDMI 2.0 Type A with

HEAC Plug Test Point Adapter, with 6 inch

SMA cables or

BIT-1010-0100-1, HDMI Type D with HEAC

Test Point Access Plug Adapter or

Wilder Technologies HDMID2-TPA-P HDMI,

Type-D 2.0 Plug Adapter

4. Test Flow Chart

1Set measurement conditions by recalling a state file.

2Connect matched 3.5 mm cables to the test ports of the instrument.

3

Perform Calibraiton

- Full Calibration (ECal) and Fixture Compensation

- DUT Length Measurement

- Adjustment of Effective Rise Time

4

Perform Measurements

- Differential Impedance

- Differential Return Loss

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Note: Hard Keys (Keys on the E5080B’s front panel), Soft keys (Keys on the E5080B’s screen), Buttons

of the TDR software, and Tabs of the TDR software are displayed in Bold.

5. Instrument Setup

5.1 Recalling a State File

This section describes how to recall a state file of the E5080B that includes all the measurement settings

for HDMI impedance test. The state file can be downloaded at:

www.keysight.com/find/ena-tdr_compliance

Copy the state file into the E5080B’s directory via USB mass storage device and recall the state file with

the TDR measurement class of S96011A/B software (*.tdr). Necessary parameters for testing are

automatically set up in the E5080B. Refer to Appendix for the details about manual setup.

1. Press Setup hardkey (or click Setup soft key) 2. Click Meas Class… to show the dialog for selecting a measurement class. 3. Check TDR. 4. Click OK. 5. Click OK to launch TDR in basic mode.

http://www.keysight.com/find/ena-tdr_compliance

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If TDR setup wizard is shown, click Close button in the TDR setup wizard main windows.

6. Open Setup tab of the TDR software. 7. Click File and select Recall State to open the Recall State dialog box.

8. Specify a folder and a file name (*.tdr) and click Open.

5.2 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. Open Setup tab of the TDR software. 2. Click File and select Save State to open the Save State dialog box. 3. Enter file name and save the state file.

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5.3 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 E5080B. Full calibration is performed by using the 2- or 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.

5.3.1 ECal Calibration & Fixture Compensation

Full calibration is performed by the TDR measurement class with E5080B. The 4-port ECal Module (i.e. N4433D) connected to the E5080B is necessary for the calibration procedure. CAUTION: Do not apply DC bias voltage during the calibration. The ECal can be damaged by DC bias voltage higher than +- 3V DC.

1. Open Setup tab of the TDR software. 2. Click ECal to launch the Full Calibration (ECal) and Fixture Compensation Wizard.

3. Perform Full Calibration (ECal) a. Connect E5080B Port 1 & 2 to the ECal Module with the test cables b. Click Calibrate to launch calibration wizard

c. Select 2 Port ECal (or 4 Port ECal) to perform full 2-port calibration. d. Select “Port 1” as 1st port and “Port 2” as 2nd port. e. Click Next>

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f. Follow instructions of calibration wizard until the calibration is complete.

4. Perform Fixture Compensation a. Disconnect the cables from the ECal module b. Connect the cables to the test fixture. Do not connect DUT c. Click Fixture Comp to perform fixture compensation d. Once green check mark appears, click Finish

5.3.2 DUT Length Measurement

Full calibration is performed by the TDR measurement class with E5080B. The 4-port ECal Module (i.e. N4433D) connected to the E5080B is necessary for the calibration procedure.

CAUTION

1. Open Setup tab of the TDR software. 2. Click DUT Length - Auto to launch the DUT Length Wizard

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3. Perform DUT Length Measurement a. Connect the test fixture to the DUT. Do not power on the DUT. b. Click Measure to specify DUT’s electrical length c. Once green check mark appears, click Finish

5.3.3 Adjustment of Effective Rise Time

The effective rise time at the open end of the HDMI connector of the test fixture is adjusted for differential impedance measurements. DUT is disconnected during the adjustment procedure. 1. Open TDR/TDT tab. 2. Click Trace 1 (Tdd11) for Differential Impedance. 3. Click Parameter tab. 4. Select “Time Domain” and “Differential” for Measure. 5. Select Format to “Volt”. 6. Click Marker Search and select “Rise Time (10 – 90%)”. 7. Press Run to measure the rise time on the screen. 8. Set Horizontal scale to 500 ps/div and reference position to -750 ps.

9. Enter rise time until the measured rise time on trace 1 (Tdd11) is close to the specified value of 200 ps, but not exceed 200 ps.

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10. Click Marker Search and select “Rise Time (10 – 90%)” to turn off the marker. 11. Select Format to “Impedance”.

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6. Measurement and Data Analysis

6.1 Differential Impedance

This section describes how to recall a state file of the E5080B that includes all the measurement settings

for HDMI impedance test. The state

1. Turn on the source DUT and configure the DUT to output the highest DUT-supported character rate signal. 2. Connect the test fixture to the Source DUT HDMI output connector (Figure 1).

Figure 1. Differential Impedance for Source DUT - Test Setup

Note: +3.3 V DC should be applied from the DC power supply connected to the internal bias-tee port for Port 1 and Port 2 on the E5080B’s rear panel. Note: Internal DC sources of E5080B with option 175 can be used, as long as the supply current to DUT is within 200 mA. Connect “AUX 1 Out” and bias tee input for port 1, and “AUX 2 Out” and bias tee input for port 2.

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Note: Unused TMDS differential lines of the test fixture should be connected to +3.3V with 50 ohm pull-ups.

3. Select Trace 1. Note: If the trace data is not stable, adjust the IF Bandwidth under Average tab to a narrower setting. The default setting is 10 kHz.

4. Press Stop Single.

5. Press Auto scale and select “X” of X-axis.

6. Turn on the marker 1 to measure the impedance at the DUT Source Termination (ZDIFF_TERM) where the

impedance stabilizes.

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Figure 2. Source Differential Impedance Example

a. If (ZDIFF_TERM > 150 ohm), then FAIL. b. If (115 ohm < ZDIFF_TERM) and (ZDIFF_TERM <= 150 ohm), go to step 7. c. If (85 ohm <= ZDIFF_TERM) and (ZDIFF_TERM <= 115 ohm), go to step 8. d. If (75 ohm <= ZDIFF_TERM) and (ZDIFF_TERM < 85 ohm), go to step 9. e. If (ZDIFF_TERM < 75 ohm), then FAIL.

7. Measure differential impedance when 115 ohm < ZDIFF_TERM <= 150 ohm.

a. Open Setup tab. b. Under More Functions tab, click Advanced Mode >> and then click Yes.

c. Press Marker to turn on marker 1. d. Set marker range between DUT HDMI output connector and DUT Source Termination.

➢ Press Search > Main > Domain and select User 1 for marker search range

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➢ Press Search > Main > Domain Start and set start point of X-axis in time (ex. yy nsec) at DUT

HDMI output connector. ➢ Press Search > Main > Domain Stop and set stop point of X-axis in time (ex. zz nsec) at DUT

Source Termination. e. Find the data point where the measured impedance is 115 ohm (115 ohm point).

➢ Press Search > Target > Target Value and enter “115 ohm” for target search value. ➢ Press Search > Target > Target Search to find the data point with 115 ohm. ➢ Continue to press Search > Target > Target Right >> Search until the last 115 ohm point before

the DUT Source Termination area. Record the value of the last 115 ohm point in time (ex. xx nsec). Note: When the target value cannot be found in the search area, the error message, “Target value not found” is displayed in the screen.

f. The range between the DUT HDMI output connector and the last 115 ohm point is defined as a measurement area. Set the marker search range in the measurement area. ➢ Press Search > Main > Domain Start and set start point of X-axis in time at DUT HDMI output

connector. ➢ Press Search > Main > Domain Stop and set stop point of X-axis in time at last 115 ohm point

(recorded at step 7-e). g. Search the maximum and minimum impedance values (ZDIFF_HIGH and ZDIFF_LOW) in the measurement

area. ➢ Press Search > Main > Max Search to find ZDIFF_HIGH. ➢ Press Search > Main > Min Search to find ZDIFF_LOW.

h. Verify the measured impedance values (ZDIFF_HIGH and ZDIFF_LOW) meet the pass criteria listed in Table 2.

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Figure 3. Source Differential Impedance (115 < ZDIFF_TERM <= 150 ohm)

Note: If the impedance is not monotonically increasing between 115 ohm point and DUT Source Termination (illustrated in red, Figure 3), then FAIL.

8. Measure differential impedance when 85 ohm <= ZDIFF_TERM <= 115 ohm. a. Open Setup tab. b. Click Advanced Mode >> and then click Yes.

c. Press Marker to turn on marker 1. d. Set marker range in the measurement area between DUT HDMI output connector and DUT Source

Termination. (Figure 4) ➢ Press Search > Main > Domain and select User 2 for marker search range ➢ Press Search > Main > Domain Start and set start point at DUT HDMI output connector. ➢ Press Search > Main > Domain Stop and set stop point at DUT Source Termination. ➢ Press Marker Search > Search Range and turn on the search range.

e. Search the maximum and minimum impedance values (ZDIFF_HIGH and ZDIFF_LOW) in the measurement area. ➢ Press Search > Main > Max Search to find ZDIFF_HIGH. ➢ Press Search > Main > Min Search to find ZDIFF_LOW.

f. Verify the measured impedance values (ZDIFF_HIGH and ZDIFF_LOW) meet the pass criteria listed in Table 2.

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Figure 4. Source Differential Impedance (85 <= ZDIFF_TERM <= 115 ohm)

9. Measure differential impedance when 75 ohm <= ZDIFF_TERM < 85 ohm.

a. Open Setup tab. b. Click Advanced Mode >> and then click Yes.

c. Press Marker to turn on marker 1. d. Set marker range between DUT HDMI output connector and DUT Source Termination. (Figure 5)

➢ Press Search > Main > Domain and select User 3 for marker search range ➢ Press Search > Main > Domain Start and set start point of X-axis in time (ex. yy nsec) at DUT

HDMI output connector. ➢ Press Search > Main > Domain Stop and set stop point of X-axis in time (ex. zz nsec) at DUT

Source Termination. e. Find the data point where the measured impedance is 85 ohm (85 ohm point).

➢ Press Search > Target > Target Search to find the data point at 85 ohm. ➢ Continue to press Search > Target > Target Right >> Search until the last 85 ohm point before the

DUT Source Termination area. Record the value of the last 85 ohm point in time (ex. xx nsec). Note: When the target value cannot be found in the search area, the error message, “Target value not found” is displayed in the screen.

f. The range between the DUT HDMI output connector and the last 85 ohm point is defined as a measurement area. Set the marker search range in the measurement area. ➢ Press Search > Main > Domain Start and set start point of X-axis in time at DUT HDMI output

connector. ➢ Press Search > Main > Domain Stop and set stop point of X-axis in time at last 85 ohm point

(recorded at step 9-e). g. Search the maximum and minimum impedance values (ZDIFF_HIGH and ZDIFF_LOW) in the measurement

area. ➢ Press Search > Main > Max Search to find ZDIFF_HIGH. ➢ Press Search > Main > Min Search to find ZDIFF_LOW.

h. Verify the measured impedance values (ZDIFF_HIGH and ZDIFF_LOW) meet the pass criteria listed in Table 2.

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Figure 5. Source Differential Impedance (75 <= ZDIFF_TERM < 85 ohm)

Note: If the impedance is not monotonically decreasing between 85 ohm point and DUT Source Termination (illustrated in red, Figure 5), then FAIL.

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Table 2. HDMI Source Differential Impedance Pass/Fail Criteria

*1. If the impedance is not monotonically increasing from the last 115 ohm point to the Source Termination, then WARNING. *2. If the duration of violation is 250 ps or larger, or there is more than one exclusion, then WARNING. *3. If the impedance is not monotonically decreasing from the last 85 ohm point to the Source Termination, then WARNING.

10. Repeat the same impedance measurement for the other TMDS data differential pairs.

6.2 Differential Return Loss (Informative)

Differential return loss in frequency-domain of the DUT source can be monitored with the same setup of

the differential impedance measurement. The measured result is displayed on trace 2.

1. Connect DUT (Figure 1). 2. Select Trace 2 (Sdd11).

3. Press Stop Single.

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7. [Appendix] Manual Setup The procedure of manual setup for impedance (time-domain) and return loss (frequency-domain)

measurements are introduced in the section. All the following parameters are saved in the E5080B’s state

file.

7.1 Launch TDR Class

1. Press Setup hardkey (or click soft key) 2. Click Meas Class… to show the dialog of selecting a measurement class with E5080B. 3. Check TDR. 4. Click OK. 5. Click OK to launch TDR in basic mode.

7.2 Channel & Trace Setup

If TDR setup wizard is shown when launching the TDR software, click Close button in the TDR setup wizard main window. 1. Click Setup tab in the TDR software. 2. Click Preset to preset the instrument. Click OK in a dialog box to continue. 3. Set DUT Topology to “Differential 1-port”. Click OK in a dialog box. 4. Set Source Power to “-20 dBm”.

5. Click Average tab. 6. Set IF Bandwidth to “10 kHz”. 7. Click Stop Single.

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8. Open TDR/TDT tab. 9. Click Trace Control tab.

10. Clear Time and Marker check box under Coupling.

7.3 Differential Impedance

1. Click Trace 1 (Tdd11). 2. Open TDR/TDT tab. 3. Open Parameters tab. 4. Select “Time Domain” and “Differential” for Measure. 5. Select Format to “Impedance”. 6. Select “10-90%” and set “200 ps” for Rise Time. 7. Click Tdd11. 8. Click the box below the left knob under Vertical. Set the vertical scale to “10 Ohm/div” in a dialog box. 9. Click the box below the right knob under Vertical. Set the vertical center to “50 Ohm” in a dialog box.

7.4 Differential Return Loss

1. Click Trace 2 (Sdd11). 2. Open TDR/TDT tab. 3. Open Parameters tab. 4. Select “S-Parameter” and “Differential” for Measure. 5. Select Format to “Log Mag” 6. Click Sdd11. 7. Click the box below the left knob under Vertical. Set the vertical scale to “10 dB/div” in a dialog box. 8. Click the box below the right knob under Vertical. Set the vertical center to “0 dB” in a dialog box.

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For more information on Keysight Technologies’ products, applications or services,

please contact your local Keysight office. The complete list is available at:

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This information is subject to change without notice. © Keysight Technologies, 2020, Published in USA, September 7, 2020, 3120-1468.EN

Web Resources

www.keysight.com/find/ena-tdr_compliance

www.keysight.com/find/usb-vna

www.keysight.com/find/na

www.keysight.com/find/vnasoftware

www.keysight.com/find/ecal

http://www.keysight.com/find/ena-tdr_

http://www.keysight.com/find/ena-tdr_compliance

http://www.keysight.com/find/usb-vna

http://www.keysight.com/find/na

http://www.keysight.com/find/vnasoftware

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hdmi2.1 source test procedure

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