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Differential pair for USB type B and AB

ican7 , 09-10-2015, 02:17 AM
Hi Robert , I have a reference design I am working on and there are two USB connectors and each connected to a micro controller and there are two micro controllers in total. The USB connectors are type AB and B. How can I determine what impedance value they used for the differential pairs coming from the micro-controllers to the USB connectors ?
robertferanec , 09-10-2015, 02:26 AM
USB 2.0 is normally routed by 90 OHMS Differential and 45 Single ended. Here is an example of a design guide (see page 183): COM Express Carrier Design Guide

Please, did my other answers help you? You have never replied to them. Thanks.
ican7, 09-10-2015, 02:43 AM
Thank you Robert , I found the answer in the guide you provided.
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