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High speed design [Texas Instruments, Data Transmission Design - - PowerPoint PPT Presentation
High speed design [Texas Instruments, Data Transmission Design - - PowerPoint PPT Presentation
High speed design [Texas Instruments, Data Transmission Design Seminar, 1998, SLLDE01C] Note: we are talking about a distributed model of a line; the upper one is the model of one segment only (there is an infinite number of them in series)
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Note: we are talking about a distributed model of a line;
the upper one is the model of one segment only (there is an infinite number of them in series)
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critical
1 0.5
(one way), i.e. shorter than the signal “round trip” time
in these formulas tp is the propagation time per unit length
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In this example, Zo < Ro and Zo < Rt
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Series termination
Not recommended in multipoint applications (settling
time ~ 2*tprop)
If the driver has different values of Zout at high and low
level -> poor matching
- but acceptable if (Zout+R)~ 60-100% of Z0
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(1) see slide /009/; Rin, osc and Rout, gen are in // (2) see slide /003/ (2) (1)
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(case 3): shielding wire connected to ground at both ends
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(if A not terminated)
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len
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As a consequence of the skin effect, a transmission line behaves as a low-pass filter
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