Signal Integrity — question 1 of 10
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You're handed a schematic with a digital signal that has a 200 picosecond rise time, driven through a trace that is 4 inches long on FR4 (propagation velocity roughly 6 inches per nanosecond). Someone on the team says 'it's a low speed signal, don't worry about it.' Is that a correct way to decide whether this trace needs to be treated as a transmission line? Walk me through how you'd actually make that call.