For years, we've been hearing how the edges of digital signals make every PCB trace into a transmission line. Where there's plenty written about the subject, those who teache signal integrity always get an audience. At DesignCon 2014, Signal Integrity Evangelist Eric Bogatin packed the Chiphead Theater with his educational and entertaining talk about what happens to step responses as they travel along a PCB trace. If you heard Eric's talk, then you should have no trouble answering this week's quiz questions. As always, answers appear on the last page. The images are for illustration only should not be used to derive your answers.
1. A 1-V step edge is launched into a 50 Ω transmission line. What is the voltage that would be measured at the far end when the step edge gets there, if the end is open, shorted or terminated into 50 Ω?
Thanks as always Martin, I got 3/4 - not bad considering the last time I realy looked at this theory was 30 years ago or so. A little more explanation in the answers would have been nice, or a web reference.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.