Hi Guys,
I need your thought guys! (Tech Guy, Audio Tech, Sound Engineer) or anybody knowledgeable.. Regarding the issue of desktop/laptop USB ports having input impedance at 90Ω differential for both inverting (DM) & non-inverting (DP) data signal path and USB guitar link having an output impedance of 50Ω.. Considering the usual "10 times higher rule" that most of us are used to in handling impedance matching..
thanks in advance! (http://www.mysmiley.net/imgs/smile/happy/happy0159.gif) God Bless Ü (http://www.mysmiley.net/imgs/smile/angel/angel09.gif)
• USB (desktop, laptop, etc) Input Impedance 90Ω:
(https://pedal-max.webs.com/USB_Impedance_Wiki.jpg)
►►► Universal Serial Bus (USB) by Wikipedia ◄◄◄ (https://en.wikipedia.org/wiki/USB)
(https://pedal-max.webs.com/USB_Impedance.jpg)
►►► USB Hardware Design Guide ◄◄◄ (https://www.silabs.com/documents/public/application-notes/AN0046.pdf)
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• USB Guitar Link Ouput Impedance 50Ω:
(https://pedal-max.webs.com/USB_Guitar_Link_Impedance.jpg)
►►► USB Guitar Link UCG102 User Manual ◄◄◄ (https://imagescdn.juno.co.uk/manual/493880-01U.pdf)