WIP - PCB Design

• Test points and designing for high-speed frequency

  • Basic takeaway is that for a PCB design you might want to insert pads on a trace to make it easier for the manufacturer to test the electrical characteristics of a certain node. Such pads can act as stubs with a parisitic capacitance to ground at higher frequencies. The test point should be close to the trace in order to avoid this.

• Very dry tutorial of using an oscilloscope to test the quality of a high speed USB device

  • At 6:49 shows a bunch of tests that could be looked into further to learn more about what sort of tests you might do to characterize high-speed samples.

• Additional information on signal-testing (USB 2.0-specific)

• What is an eye diagram?

  • A way to look at ALL of the rising edges and falling edges for a given captured signal. They help you to identify lost packets and stuff like that.

  • Can be applied at the receiver OR the transmitter. You should try to collect eye diagrams from various points throughout the system in order to better diagnose issues.

  • If your eye diagram is fucked up it might be the transmission media, ESD, or external noise sources.