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1、EIA STANDARD TP-90 Crosstalk Ratio Test Procedure for Electrical Connectors, Sockets, Cable Assemblies or Interconnect Systems EIA-364-90 JANUARY 2000 ELECTRONIC INDUSTRIES ALLIANCE Electronic Components, Assemblies, Equipment see figures A2 and A.3, these are included in the fixture. 2.2.5 Referenc
2、e fixture technique In this technique a separate fixture that combines both near end and far end is used for the fixture crosstalk measurement. This fixture shall be a duplicate of the specimen fixture, only without the specimen. Traces, if used, shall include fixture connectors, vias, bends and cor
3、ners. If baluns are used for a balanced measurement, or minimum loss pads used for impedance matching; see figures A.2 and A.3, these are included in the fixture. 3 Test specimen 3.1 Description For this test procedure the test specimen shall have more than one signal line and shall be one of the fo
4、llowing: 3.1.1 Separable connectors A mated connector pair. 3.1.2 Cable assembly Assembled connectors and cables, and mating connectors. 3.1.3 Sockets A socket and test device or a socket and pluggable header adapter. Copyright Electronic Components, Assemblies see figures A.2 and A.3, these are inc
5、luded in the term “fixture“. If the referencing document specifies the fixture so that its crosstalk contribution is known, then the fixture crosstalk measurement is optional. 4.2.1.3 Unless otherwise specified all measurement results shall contain a minimum of 200 frequency points. Generate a magni
6、tude versus frequency plot; 10 dB per division vertical scale and log frequency sweep are recommended. When applicable, single frequency results shall be tabulated, as specified in the referencing document. 4.2.2 Insertion technique 4.2.2.1 Network analyzer 4.2.2.1.1 Assemble the fixture so that the
7、 near end is connected to the far end without the specimen in between. Connect the network analyzer ports to the appropriate locations of the fixture. Perform a “through“ calibration. If the requesting document specifies the measurement be referenced to the output of the driven line rather than the
8、input, perform this calibration with the specimen in the fixture. 4.2.2.1.2 Measure S21 in dB without the specimen, which is the fixture crosstalk ratio. Copyright Electronic Components, Assemblies see 2.2.2. If this is not done fixture crosstalk shall be measured; see 4.1.1.2 and 4.2.1.2. 5.2 Time
9、domain only 5.2.1 Measurement system rise time and reference points, if other than from 10% to 90%. The drive signal shall be defined, including the minimum (0%) and maximum (100%) voltage levels, risetime(s), and duty cycle. 5.2.2 Waveform plots, if desired 5.2.3 Peak-to-peak values, if desired 5.3
10、 Frequency domain only 5.3.1 Frequency span 5.3.2 Plot magnitude format, if not dB and log frequency 5.3.3 Equipment preference, if any 5.3.4 Results at a single frequency, if any. When only these results are desired instead of plots, it shall be requested. Copyright Electronic Components, Assemblie
11、s & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA-364-90 Page 11 6 Test documentation Documentation shall contain the
12、details specified in clause 5, with any exceptions, and the following: 6.1 Title of test 6.2 Calculated crosstalk ratio (zero to peak) values including sign, either positive or negative (time domain), or plots (frequency domain). 6.3 Fixture crosstalk ratio peak values, either positive or negative (
13、time domain), or plots (frequency domain) 6.4 All details relating to data interpretation when specimen or specimen environment impedance is not matched to the measurement system characteristic impedance 6.5 Test equipment used, and date of last and next calibration 6.6 Name of operator and date of
14、test NOTE Ignore overshoot and undershoot when calculating 0% and 100% levels. Figure 1 - Waveform Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo
15、 reproduction or networking permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking pe
16、rmitted without license from IHS -,-,- EIA-364-90 Page A-1 Annex A Normative Figure A.1.a - Insertion technique Figure A.1.b - Reference fixture technique Figure A.1 - Technique diagrams Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licens
17、ee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA-364-90 Page A-2 Minimum loss pad equations: R1 = 50 1 - (Zo / 50) 0.5R1 = Zo 1 - (50 / Zo) 0.5 R2 = Zo / 1 - (Zo / 50) 0.5 R2 = 50 / 1 - (5
18、0 / Zo) 0.5 Figure A.2 - Single-ended terminations Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without li
19、cense from IHS -,-,- EIA-364-90 Page A-3 Minimum loss pad equations: R1 = Zo 1 - (100 / Zo) 0.5 / 2R1 = 100 1 - (Zo / 100) 0.5 / 2 R2 = 100 / 1 - (100 / Zo) 0.5R2 = Zo / 1 - (Zo / 100) 0.5 Figure A.3 - Differential (balanced) terminations Copyright Electronic Components, Assemblies & Materials Assoc
20、iation Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA-364-90 Page A-4 Figure A.4 Example of far end crosstalk with balanced terminations see
21、figure A.3.a (2nd) and figure A.3.b for Zo = 100 Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without lice
22、nse from IHS -,-,- EIA-364-90 Page B-1 B Informative B.1 Practical guidance Near perfect resistive terminations of the signal lines may not be possible at high frequencies due to parasitic reactances in both signal and ground conductors. These reactances will have an impact on measured results. In t
23、his case it is desirable that the test fixture duplicate the exact geometry (parasitics) of the actual application. This may involve the use of transmission lines in addition to the components of figures A.1 and A.2. Most instruments used for these measurements are internally terminated in 50 ohms a
24、t both source and detector ports. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,
25、-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA Document Improvement P
26、roposal If in the review or use of this document, a potential change is made evident for safety, health or technical reasons, please fill in the appropriate information below and mail or FAX to: Electronic Industries Alliance Engineering Department Publications Office 2500 Wilson Blvd. Arlington, VA
27、 22201 FAX: (703) 907-7501 Document No.Document Title: Submitters Name:Telephone No.: FAX No.: e-mail: Address: Urgency of Change: Immediate:At next revision: Problem Area: a. Clause Number and/or Drawing: b. Recommended Changes: c. Reason/Rationale for Recommendation: Additional Remarks: Signature:
28、Date: FOR EIA USE ONLY Responsible Committee: Chairman: Date comments forwarded to Committee Chairman: Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 M
29、DTNo reproduction or networking permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networkin
30、g permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:49:00 MDTNo reproduction or networking permitted without license from IHS -,-,-