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crosstalk between 2 conductors in a cable

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coolhand21

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Hi I have two serial data lines send an recieved. when transmiting I noticed hash on the recieve.
The hash is related to the transitions. The voltage swing is 3.3v, the rise time is 30ns
and there is ringing during transitions.

what method is need to clean this up?

cool
 

zorro

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Hi Cool,

In non balanced signals / non twisted pairs, slew rate (rise and fall times) is controlled for reduce crosstalk and ringing, like in RS-232, but this limits speed. Length is a limitation too.
Crosstalk is minimized with balanced signals over twisted pairs with different twist lengths. Ringing and reflections in high-speed links is avoided with matched terminations.


Regards

Z
 
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coolhand21

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in non balance lines/ non twisted pair would you recommand terminating resistors or a snubber. are there any other solutions
 

cks3976

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Termination resistor is a simpler choice. Place it close to the the stronger driver.
 

FvM

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Strictly spoken, termination resistors can't reduce or even remove crosstalk. They can at best dampen multiple signal reflections that make crosstalk worse. But if crosstalk endangers correct signal transmission, you need to refer to balanced lines and possibly individual screened signals.
 

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