Hi Team,
I was learning about USB2.0 layout guidelines from this material[USB Layout Guidelines].
In page 2 you can see the statement that says a single-ended impedance is not critical as differential impedance.A range of 42 to 78 ohms is acceptable(equivalently common-mode impedance must be between 21ohms to 39ohms).
As per my knowledge, here single-ended impedance(my understanding about single-ended impedance is the impedance of D+ or D- line measured w.r.t GND) and its value must be 45 Ω ±10%. Please correct me if I am wrong.
May I know about which single-ended impedance this document says a range of 42ohms to 78Ohms is acceptable?
I don't have any idea about the common-mode impedance they mentioned in the document. Could you please explain about this common-mode impedance also?
Regards
Hari
I was learning about USB2.0 layout guidelines from this material[USB Layout Guidelines].
In page 2 you can see the statement that says a single-ended impedance is not critical as differential impedance.A range of 42 to 78 ohms is acceptable(equivalently common-mode impedance must be between 21ohms to 39ohms).
As per my knowledge, here single-ended impedance(my understanding about single-ended impedance is the impedance of D+ or D- line measured w.r.t GND) and its value must be 45 Ω ±10%. Please correct me if I am wrong.
May I know about which single-ended impedance this document says a range of 42ohms to 78Ohms is acceptable?
I don't have any idea about the common-mode impedance they mentioned in the document. Could you please explain about this common-mode impedance also?
Regards
Hari