karesz said:I can not agree with "in fact it can be better not to put them too close"_spaceing is beween two (diff)lines is practically between the copper with up to 2x, but you must it exactly callculate! Sorry, is not to say: better so and so... From field theory: the both fields are to work with others, thes means=>> exactly determined distance need too....
karesz said:3,
For sufficient diff.-working against commonmode disturbances is a matched impedance needed between the both traces!
Hi,...there are reasons why the traces can have more problems when they are together. For example, the need and difficulty to keep their impedances, since they are affecting each other; so if they must get separated to avoid some obstacle, their impedances change and must be readjusted. In fact, the recommendation in the PDF is to use a rule of the type "not closer than"!
..."tight coupling between members of a differential pair does not protect them from crosstalk"...karesz said:3,
For sufficient diff.-working against commonmode disturbances is a matched impedance needed between the both traces!
Of course, this isnt "commonmode effect" if only the one line is influenced!...You'd need a twisted pair (not a couple of straight traces) to get the interference as common mode noise..
I have very little experience , so I can't discuss that.karesz said:Sorry, I have much high-speed & highest density boards in my pratice;
The point is: although the software can help you, maybe the board won't be let you do what you want. That is my case, in which I simply CAN'T route the pairs together in the same plane - unless I switched manufacturing technologies or added layers to the PCB, which is out of the question.karesz said:you must calculate a diff-line "As a diff-line" & not 2 individuals!!
Your design system/SW gives you the needed distances, ofcourse you can set other as the resultat is, than recalculate it & you will become other line withs/thickness or even material thickness too!
Even: physics is not so easy to rebacking_but not npossible!mijail said:I have very little experience , so I can't discuss that...karesz said:Sorry, I have much high-speed & highest density boards in my pratice;
...so he even debunks a number of rules-of-thumb.
Sorry, you will be "waked up": latest as your board will be to test!...karesz said:you must calculate a diff-line "As a diff-line" & not 2 individuals!!
...and if they never get too close, their impedances will be independent! So, no need for recalculations and adjustments: less problems, less chances for errors, AND more flexible routing. So even autorouting would benefit from this.
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