If you have to work with high speed devices or signals (USB, many high end ADCs, etc.) chances are you’ll need to deal with differential signals. Unlike single-ended signals, the layout requirements are quite different, and a lot more care needs to be taken when designing PCBs with differential traces. There’s LOTS of literature out there on the topic (thankfully), but working on a new board with differential signals this week I found Differential Signaling and it’s Design Requirements from Speeding Edge to be a good general purpose overview, with some concrete but accessible explanations, tip and tricks.
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