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standard difference signal lines in PCB layout

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monimi

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Hi, i wanted to ask how are the standard difference signal lines rules when drawing differential lines in PCB layout? (please help, i need this as soon as it can be)
 

More info please:
But you need to know required characteristic impedance required for the signals, number of layers (and thus dielectric thickness), track width, etc etc.
 

marce said:
More info please:
But you need to know required characteristic impedance required for the signals, number of layers (and thus dielectric thickness), track width, etc etc.
Click to expand...

Hi, thanks for the reply, i need to know the distance between tracks, track width and max length of the lines (tracks) between D+ and D- of USB lines, and between UART Rx and Tx lines. What values are the appropriate for a good performance?.
 

https://www.skottanselektronik.com/
Impedance calculator.
USB D+/D- 90ohm diff impedance, max skew between lines 1mm (6 layer stripline routed approx. 0.17/0.17/0.17)
UART lines ref data sheet, but generally don't have to length match Rx Tx only diff pairs
 

marce said:
https://www.skottanselektronik.com/
Impedance calculator.
USB D+/D- 90ohm diff impedance, max skew between lines 1mm (6 layer stripline routed approx. 0.17/0.17/0.17)
UART lines ref data sheet, but generally don't have to length match Rx Tx only diff pairs
Click to expand...


Thanks for the reply. And which would be the right width for each USB line (D+/D-)?
 

Provide number of layers, PCB material (FR4) I presume, layers you are going to route d-+ on (inners or outers).
 

There is no "standard". Depends on stackup.

As for UART: TX and RX do not form a differential pair, rather the contrary.
 

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