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USB differential pair using Saturn PCB

Rajinder

Jan 30, 2016
568
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Jan 30, 2016
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568
Hi all,
I am currently looking to use USB 2.0 (480Mbps speed) on a design. The USB differential signal coming in from a USB connector to a PIC microcontroller.
I have tried using Saturn to give me a 90 Ohm differential impedance (see below), I am using FR4 PCB and 1oz copper (i.e. 18um copper + 19um plating = 35micros i.e. 1oz).

I can't get the required Z differential of 90ohms. Can anyone help and assist? Not sure what I am doing wrong. Also is the length of the track going to be critical, it will be about 10mm?

upload_2020-11-6_12-6-49.png

Thanks in advance.
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
13,652
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Nov 17, 2011
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Adjust conductor spacing. ~ 100 µm will result in Zdiff ~ 90 Ω.
 
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