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  1. Electrical

WIP - PCB Design

PreviousCommon ICsNextWIP - High frequency circuits

Last updated 2 years ago

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    • 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.

    • 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.

  • (USB 2.0-specific)

    • 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.

Test points and designing for high-speed frequency
Very dry tutorial of using an oscilloscope to test the quality of a high speed USB device
Additional information on signal-testing
What is an eye diagram?