Coupled Differential Pair Crosstalk Study.


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Diagram . . Prologue to Differential Pair - What is Differentail Pair Transmission Line? - Differential Pair Even/Odd Mode Analysis - Growing Importance of Differential PairSchematicsMeasurement Issues/Challenge Design. What is Differential pair Transmission Line? . . . .
Transcripts
Slide 1

Coupled Differential Pair Crosstalk Study Joon Hyung Chung

Slide 2

Overview Introduction to Differential Pair - What is Differentail Pair Transmission Line? - Differential Pair Even/Odd Mode Analysis - Growing Importance of Differential Pair Schematics Measurement Issues/Challenge Design

Slide 3

What is Differential match Transmission Line? 1 2 Figure 1 : A symmetric Pair Any products of two coupled transmission lines including the Return way

Slide 4

Differential Pair Even/Odd Analysis 1 2

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Growing Importance of Differential Pair High speed interconnect (LVDS) Rambus RDRAMs timekeepers Gigabit Ethernet IEEE 1394(High Speed Serial Bus)

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8 Port Differential Pair Lines Fan-Out Fan-Out 1 5 Differential Pairs 2 6 8 4 7 3

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Measurement Probe Station, Network Analyzer Problem Tight Coupling (Need for Fan-Out) De-inserting Difficult to reproduce Solutions ???

Slide 8

Objective and Challenges Objective : To precisely give the x-discussion of the differential match and connect the deliberate qualities with the recreated result Challenges 1. Reproduction viewpoint: To isolate even and odd mode without bothers from each other 2. Estimation angle: To have the capacity to isolate the fan-out and de-installed model to gauge the S & ABCD parameter grids effectively

Slide 9

Differential Pairs Permittivity: 8.8 (Al) Conductor:Au Use Terminals in HFSS to dole out Differential Pairs!! Four coupled differential Lines associated with pizazz on both edges

Slide 10

Differential Pairs

Slide 11

Differential Pairs

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Differential Pairs Result in HFSS shows that basic mode exist in the differential method of the S framework Unwanted modes include up(crosstalk) because of asymmetry of the differential framework

Slide 13

Approach I Use ABCD parameters of the individual system Single-finished Measurement of Fan-Out in three models (Short, Open, Load) Matrix control

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Approach I (Continued) Fan-Out 2 [ABCD]1 Fan-Out1 [ABCD]2 [ABCD]3 How would we get ABCD lattice from estimation? Measure S parameters of Fan-Out1 S grid is changed over into Z framework Z lattice is changed over into ABCD network Measure Overall S parameters of the entire framework Use symmetry to get singular S parameters of Fan-out 2

Slide 15

Approach (Continued) De-insert the differential combine Use even and odd examination to discover differential S parameters to discover the crosstalk Code in Mat-Lab to confirm the hypothesis Measurement of S parameter required

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