[SI-LIST] 90ohm vs 100ohm differential line impedance

  • From: Hassan O. Ali <hassan@xxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 29 Jan 2010 23:32:21 -0500

 
          BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; } 
 Hi All, 

        Does anyone know why some interface standards (like USB) specify 
90ohm differential line impedance instead of the more common 100ohm? 

        Best regards. 

        Hassan.

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