#### engr_joni_ee

##### Advanced Member level 3

In the stackup editor I have Top, GND1, InnerSignal1, AVDD, DVDD, InnerSignal2, GND2, Bottom. This is eight layer stackup.

On the top layer and I have 50 ohm impedance for single ended signals with a trace width 7.72 mil. The same in true for bottom layer.

For differential signals on the top layer, I have 100 ohm impedance for trace width 5 mil and gap 5.16 mil.

I have one differential pair in the transmission line. If I chose trace width 5 mil and gap 5.16 mil for differential pair on the top layer. The differential impedance is 100 ohm but the single ended impedance is 60.7 ohm which I am worried about.

Do we also need to have exactly 50 ohm impedance for each individual trace in differential pair ?