pcb impedance control
Thanks for this perfect answer House_cat
This is about trace length, but i think even for impedance matching. With my collegues, i discuss many times if use or not a impedance control, even when trace are short. Recently, i posted in this forum a trouble with radiated emission about multilayer PCB. Trace length are electrically short (rise time 2ns, trace length about 1.5 inches on FR4, 6 layers). PCB AC cable, measured with capacitive clamp, radiate very much (60dBpW @ 60MHz). I suppose is necessary impedance matching even if trace are electrically short...
Is correct?