Is there more than one type of controlled impedance?

FAQ about printed circuit boardsTERMINOLOGY

Yes, there isand these are explained below:

Differential impedance – Impedance of a pair of conductors with equal and opposite polarity signals – same amplitudein anti-phase with each other.

Odd mode impedance – Impedance of one side of a pair of conductors which both have equal and opposite polarity signals – same amplitude and anti-phase.

Even mode impedance – Impedance of one side of a pair of conductors which have equal signals – same amplitude and same polarity.

Common mode impedance – Impedance of a pair of conductors which have equal signs – same amplitude and same polarity.

Learn more about impedance

Design guidelines for stackups and impedances

Download our PCB design guidelines for Stackups and Impedances to get your design right from start.