[SI-LIST] 90 OHM Differential Impedance
- From: Saril <saril_k@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 21 Mar 2010 00:11:21 +0530 (IST)
Hi All,
Â
Basically USB signals require 45 Ω characteristic impedance and have a
target differential impedance of 90 Ω.
The 90 Ω Differential impedance can be achieved without having the single
ended characteristics impedance of 45 Ω. Sometimes the Single ended
characteristics impedance may be 50 Ω but still we can have the differential
impedance of 90 Ω, if we tune the differential trace separation.
How important is it to meet single ended as well as differential impedance
requirements together, can I just neglect the single ended impedance and
consider only the differential impedance value.
Thanks in advance.
Regards,
Saril Kaiprath
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