ELECTRICAL MODEL DOCUMENTATION - Molex · ELECTRICAL MODEL DOCUMENTATION REVISION: ECN INFORMATION: TITLE: Impact Ortho 6 Pair 4 Wafer 100 Ohm Model (Mated Connector Only) MOLEX CONFIDENTIAL

ELECTRICAL MODEL DOCUMENTATION

REVISION: ECN INFORMATION: TITLE: Impact Ortho 6 Pair 4 Wafer 100 Ohm Model (Mated Connector Only)

MOLEX CONFIDENTIAL

SHEET No.

c EC No: TBA

1 of 11 DATE: 2011 / 03 / 12

DOCUMENT NUMBER: CREATED / REVISED BY: CHECKED BY: APPROVED BY:

EE-76290-001 P.Phuyal P.Amleshi D.Dunham

TEMPLATE FILENAME: SPM[SIZE_A](V.1).DOC

MODEL SUMMARY This document describes the application details of a full electrical model (S-parameter) of an Impact Ortho connector containing 4 wafers, each holding 6 differential pairs and their associated grounds. The signal paths simulated by the model consist of an ortho daughter card connector mated to an ortho backplane header. The model contains de-embedded launch structures, but no PCB pad or trace structures are included. The electrical model was simulated using Ansoft HFSS in the Frequency domain. The frequency range of this simulation is from 0 GHz to 25GHz with increments of 0.02 GHz.

APPLICABLE PART NUMBERS:

76285-Series (backplane header), 76290-Series (daughter card connector)

THIS SUPPORT DOCUMENT IS ASSOCIATED WITH, AND APPLICABLE TO S-PARAMETER MODEL Impact_Ortho_100ohm_6pair_4wafer.s96p ONLY.

MODEL TYPE: SPM STRUCTURE: Mated Connector

MODEL SOURCE: Simulation VALIDATION: No

NUMBER OF PORTS: 96 MAXIMUM FREQUENCY: 0~25 GHz

DISCLAIMERS: Information contained in this document is simulated. Molex Incorporated does not

guarantee the performance of the final product to the information provided in this document. Molex does not represent, warrant or guarantee the accuracy of the information, expressly disclaims all warranties including the implied warranties of merchantability and fitness for particular purpose, and shall not be liable for any damages whatsoever arising from use of, or inability to use, the information contained in this document or accompanying electronic file. The user is responsible for verifying the results of their use of this information, and assume all risk of doing or not doing so. Use of the electronic file evidences user's agreement to the above terms. Any charts or schematics in this report are only for general reference. The schematic allows the user to configure a similar simulation circuit in any simulation tool. The resulting charts provided allow a comparison of results to the Molex simulation using the stated schematic.



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CONDUCTOR TO PORT MAPPING TABLE SIGNAL PATHS

Conductor pin out Ports Daughter card/backplane

T1 B1 1,49

T2 C1 2,50

T3 E1 3,51

T4 F1 4,52

T5 H1 5,53

T6 J1 6,54

T7 L1 7,55

T8 M1 8,56

T9 P1 9,57

T10 Q1 10,58

T11 S1 11,59

T12 T1 12,60

T13 A2 13,61

T14 B2 14,62

T15 D2 15,63

T16 E2 16,64

T17 G2 17,65

T18 H2 18,66

T19 K2 19,67

T20 L2 20,68

T21 N2 21,69

T22 P2 22,70

T23 R2 23,71

T24 S2 24,72

Conductor pin out Ports Daughter card/backplane

T25 B3 25,73

T26 C3 26,74

T27 E3 27,75

T28 F3 28,76

T29 H3 29,77

T30 J3 30,78

T31 L3 31,79

T32 M3 32,80

T33 P3 33,81

T34 Q3 34,82

T35 S3 35,83

T36 T3 36,84

T37 A4 37,85

T38 B4 38,86

T39 D4 39,87

T40 E4 40,88

T41 G4 41,89

T42 H4 42,90

T43 K4 43,91

T44 L4 44,92

T45 N4 45,93

T46 P4 46,94

T47 R4 47,95

T48 S4 48,96



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PRE-DEFINED RETURN PATHS

PIN Label

A3 G

D3 G

G3 G

K3 G

N3 G

R3 G

C4 G

F4 G

J4 G

M4 G

Q4 G

T4 G

PIN Label

A1 G

D1 G

G1 G

K1 G

N1 G

R1 G

C2 G

F2 G

J2 G

M2 G

Q2 G

T2 G



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PART ILLUSTRATIONS

Back plane Daughter card

PORT 1 PORT 2

PORT 47 PORT 48

PORT 49 PORT 50

PORT 95

PORT 96



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REFERENCE RESULTS

Differential Insertion Loss:



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Differential Return Loss:



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Near End Crosstalk on Differential Pair P3Q3:



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Far End Crosstalk on Differential Pair P3Q3:



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Differential Impedance Tr = 50ps (10/90):

Note: Due to variations in mesh density and geometry, slight differences in impedance may occur for identical traces in different simulation models.



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PASSIVITY: The passivity of the model, unlike S-parameter results, does not indicate the expected electrical performance of the simulated connector. Rather, it is one of a number of ways to determine the accuracy of the S-parameter model in describing the connector’s electrical performance. Since (unless specifically designed to incorporate active components) all connectors are passive devices, the associated model should also be passive at all frequencies. While small non-passivity at isolated frequencies within a model does not necessarily mean that the S-parameters generated are without validity. The presence of non-passivity within a model does suggest caution in its use and closer investigate of the results.

The model is passive at all frequencies based on Ansoft HFSS passivity checker. Other methods of checking passivity may return different results based on the methods used. Very small passivity issues should have a negligible impact on the electrical simulation results.



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SKEW: Electrical length of the connector (delay) can also be derived using 3D Electromagnetic modeler. Time domain solver can readily produce this quantity. Frequency domain solver results can also be transformed to time domain to obtain the same quantity. Since the delay difference between the adjacent conductors is small (a few Pico Seconds), direct measurement can introduce substantial error due to the trace length differences, PCB material inhomogeneity. In this analysis, Ansoft HFSS solver has been used to provide information on the amount of skew between the two conductors in each differential pair of the Impacttm connector. S-parameter derived from this model is used in Ansoft Designer to obtain transmitted impulse responses. The transmission time difference between the input and the output for each signal conductor constitutes the corresponding single ended electrical delay. The difference between the delays for each conductor in a pair is the skew.

II. CONNECTOR ELECTRICAL DELAY AND SKEW

Diff Pairs Pin 1 (ps) Pin 2 (ps) Single-Ended Skew (ps) Pin 1 Pin 2

Wafer 1

B1 C1 90.8 97.4 6.6

E1 F1 113.3 119.3 6.0

H1 J1 136.9 142.5 5.7

L1 M1 157.5 163.0 5.5

P1 Q1 178.5 184.0 5.5

S1 T1 200.7 206.7 6.0

A2 B2 84.7 86.3 1.5

D2 E2 102.9 105.5 2.6

G2 H2 125.6 128.4 2.8

K2 L2 148.7 151.2 2.6

N2 P2 169.3 172.0 2.7

R2 S2 190.5 193.2 2.6

Table: Connector single ended skew as evaluated from EM model of Impact Ortho 6-pair 100 Ohm connector

Note: The length of the pin increases with alphabetical progression; A is the shortest pin and T is the longest pin for this connector.

Documents

ELECTRICAL MODEL DOCUMENTATION - Molex · ELECTRICAL MODEL DOCUMENTATION REVISION: ECN INFORMATION: TITLE: Impact Ortho 6 Pair 4 Wafer 100 Ohm Model (Mated Connector Only) MOLEX CONFIDENTIAL