Via impedance is typically specified for single ended wires, a single via embedded by plane copper. If you use two of this vias for your differential pair, they should have 50 ohm impedance each. But more likely the vias of a differential pair are closer together and not completely embedded by copper. Respectively the impedance is different.
There's no thing like a "100 ohm via". Transmission lines have differential and common mode impedance. You are designing a differential transmission line.
There's no thing like a "100 ohm via". Transmission lines have differential and common mode impedance. You are designing a differential transmission line.
Via impedance is typically specified for single ended wires, a single via embedded by plane copper. If you use two of this vias for your differential pair, they should have 50 ohm impedance each. But more likely the vias of a differential pair are closer together and not completely embedded by copper. Respectively the impedance is different.