Hi folks

I need the answer for question below.

Why we have to maintain 90 ohm impedance for USB signals and 75 ohm impedance for RGB(video) signals?

Expect the answer related to Printed circuit board technology.


  • sauravgoswami
    Dude,it all depends on Cable or device connected to USB,due to high-signalling rate impedance of cable or device is generally kept at 90ohms,anyhow the range is from 70ohms to 110ohms,similarly with RGB.
  • balaseven
    why cannot we transmit/receive USB signals through 100 ohm twisted pair cable.smae to RGB.?

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