Latest Posts

Why Serial Links?

Author: Donald Telian , SI Guys - Guest Blogger Over the past couple decades every style of high-speed interface switched to serial transmission. I/O, Graphics, Disk, Backplanes, CPU, Long-Reach, Short-Reach, you name it – everything except memory . Serial technology is reliable, extensible, and will be with us for many years to come. In practice, Serial Links are now the primary focus of Signal Integrity. Yet serial links brought significant disruption to the industry. New signaling, new ...

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Donald Telian, SiGuys - Guest Blogger 5/13/2020 Comments(0)

Simulators, Models, and the Next Great Thing

Author: Donald Telian, SiGuys - Guest Blogger Day one at my first engineering job and my manager is explaining the problem I need to solve. Signals need to transmit in a new configuration at a faster data rate than before, and it wasn’t clear if it would work. Little did I know how many times I’d get handed that same problem in the decades to come. But this time was different. Fresh out of college, my mind was full of circuit theory, network nodal analysis and differential equatio...

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Donald Telian, SiGuys - Guest Blogger 4/9/2020 Comments(0)

Simulating Serial Link Compliance

Author: Donald Telian , SI Guys - Guest Blogger Simulating a serial link typically involves confirming compliance with one of the many Serial Link Standards. PCIe, SATA, XFI, CEI, SFP+, USB, KR4, and so on. With over a dozen common standards – each with their own compliance nuances – this feels like it could be a vast and complex topic. Indeed, it takes a full-day class to address only the most popular standards. While serial links is the clear winner in signaling methods, there is n...

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Donald Telian, SiGuys - Guest Blogger 3/9/2020 Comments(0)

Serial Link Equalization Primer

Author: Donald Telian , SI Guys - Guest Blogger Equalization is powerful. SerDes Serializer-Deserializer Equalization has enabled data rates we would not have thought possible, and it continues to be the secret sauce of serial links. While good performance depends on doing basic things in hardware Steps 1 to 6 , it is arguably the configuration of SerDes Equalization Settings SES, Step 7 that determines eye margins – as illustrated in Fixing Signal Integrity Issues in Software . As such...

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Donald Telian, SiGuys - Guest Blogger 1/14/2020 Comments(0)

Understanding Connector and Package Impedance

Author: Donald Telian , SI Guys - Guest Blogger I’ve grown accustomed to viewing passive interconnect as the road signals drive on. Impedance discontinuities appear as the speed bumps or potholes that make the ride bumpy and unpleasant, if not slower. Perhaps I’ve looked at too many TDR plots ? For many years our industry has been well-tooled to understand and manage PCB trace impedance , which continues to define the majority of the road signals travel on. Over time higher data rate...

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Donald Telian, SiGuys - Guest Blogger 12/9/2019 Comments(0)

On Exercising Engineering Judgment

Author: Donald Telian , SI Guys - Guest Blogger Signal Integrity Engineering requires Engineering Judgment. The same thing that makes SI require Creativity causes it to also require above average Judgment; namely that you will consistently be asked to craft clear answers from insufficient data based on ill-defined measures of success. There’s no way around it, Engineering Judgment Required. So we’ll address this topic here in our mini-series on the soft skills required for Signal I...

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Donald Telian, SiGuys - Guest Blogger 11/8/2019 Comments(0)