1
\$\begingroup\$

I understand that for single ended RF signals I must ensure that the characteristic impedance of the transmission line matches the load impedance (say 50 ohm). I am a bit confused for differential RF signals though. Do I try and match the differential impedance to 100 ohm and the characteristic impedance to 50 ohm simultaneously?

Clarification would be appreciated

Thanks

\$\endgroup\$

1 Answer 1

0
\$\begingroup\$

Usually this means creating two 50Ω lines that form a differential pair. Because both pairs are also used differential they are coupled to each other so you need to calculate the impedance stackup and width for a 100Ω edge coupled external line. If it's internal on a PCB, you'll need the height between both layers. Use a tool like saturn PCB tool to calculate (diff pairs tab).

enter image description here

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.