EE-Training

Knowledge Makes You Curious

Crosstalk video demonstration for stripline

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A short video to demonstrate crosstalk and try to explain how that works in the stripline environment. We look at both the near-end and far-end crosstalk and also explain why that depends on the termination used.

Direct YouTube link.

In a real digital circuit, we will have one of these termination situations:

  • Open/high impedance (typical CMOS input impedance)
  • About 10-15 ohm termination (the typical output impedance of a driver)
  • Matched (typically 50 ohms) termination

In the video, we look at open and matched – you will have to interpolate for the middle case 🙂

See the video crosstalk demo on near-end and far-end crosstalk.

Crosstalk is a very important topic in signal integrity – this is the key parameter defining trace-to-trace spacing for layout. We looked at this earlier using S-parameters and just how well the simulations and measurements match.

Let me know what the next crosstalk video should look at? Maybe crosstalk for microstrip? Maybe the effect of guard traces? Or?

University SI Course – COVID’19 Version

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Challenged in all ways, we didn’t run the university SI course at DUT in the summer of 2020 like in previous years. Sad, but true. Then something amazing happened. Students started pressing for the course to run somehow. Happy to say we just completed a 14-week, COVID-19 version of the course. Some face-2-face, some over… Read more

Video: Using a Network Analyzer as a TDR

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See how you can do fast TDR measurements using a network analyzer or VNA in this video. Whenever you are designing boards with specific characteristic impedances, you will want to be able to verify that on your fabricated boards. It’s recommended to put in test traces on each layer, but how do you measure this.… Read more

Video: PDN Measurement with a Network Analyzer

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See how easily you can do a PDN measurement using a network analyzer or VNA in the video here. Building solid power distribution systems (PDN’s) is maybe the most important learning from the signal integrity training overall. Because it matters. Both for the logic functions, the signal quality (integrity) and for the radiated emissions (EMI).… Read more