V4 - PCB spec mentions non-existing 50 Ohm impedance
Feedback from INCAA:
In the specification is asked for differential impedance of 100 Ohm for
a trace with of
200u and distance 127u. For the specified differential impedance the PCB
manufacturer
must use a trace with of 190u and a trace distance of 147u. Then the
theoretical
differential impedance will be 99,42 Ohm. This results in a theoretical
single ended
impedance of 64.62 Ohm (instead of 50 Ohm).
As well the PCB manufacture keeps a trace width of 200 u, the single
ended value is far
from the specified 50 Ohm.
Conclusion: A differential impedance of 100 Ohm is incompatible with a
single ended
impedance of 50 Ohm in this design.