Signal Integrity

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While we all love increased network speed, there is an implied assumption that the backbone speeds of the internet will keep up with this rising demand placed upon it by millions of new 5G devices. PCIe 5.0 (or Gen5) represents the technology that is needed by the computer, data center, and ultimately the 5G wireless industry to enable the next generation of mobile and desktop applications. So, what is PCI Express 5.0 and how does it compare to PCI 4.0? Read on to find out.

A particularly challenging configuration is the edge launch, where connectors are used on the edge of the PCB with a transition to a microstrip trace. A poorly optimized connector footprint leads to degradation of the signal integrity performance, especially at high data rates. This paper identifies the root cause of the problem by showing how the electromagnetic fields behave at the transition area. Then it presents a design methodology, using simulated and measured data, that ensures the quality of high-speed data transmission.

eSilicon was in the Samtec booth at DesignCon 2019 presenting their collaboration with Wild River Technology to develop an advanced test system that addresses the difficult signal integrity demands of 56/112G PAM4 operation. The test system design utilizes the upcoming IEEE P370 standard in association with compliance metrics 802.3bs, OIF CEI – 56G PAM4, and COBO to validate the required performance.

Executive Q&A with Ken Willis, Product Engineering Architect at Cadence discussing product development, business challenges, and the latest developments in SI/PI design. 

While we get the scope’s bandwidth from the vendor, as soon as we add a cable, probe, or amplifier to the scope, we decrease the system bandwidth. The new system bandwidth is as important to know as the scope’s bandwidth, but it is generally difficult to measure except in a calibration lab. We offer a simple method of evaluating the transfer function and system bandwidth of any probing system using a wide band noise source. This method not only gives us information about the probes and interconnects, but it also tells us how the scope responds to the measurement system, information which cannot be measured by a VNA alone.

The paper discusses the development of GDDR6 as a lower-risk and more cost-effective solution as compared to other high-bandwidth memory solutions.

Ken Willis provides some background on the IBIS AMI standard and looks ahead to what’s next.

Eric Bogatin explores just how much better the sine wave is from a more expensive function generator compared to the lower cost units. He asks the question: Just how much bang do you get for your buck? Read on to see how he does it.

If you are working on chip and package design, ground bounce is an important concern.  SIJ Technical Editor Eric Bogatin and his University of Colorado students share the results of a study in best design practices to minimize ground bounce noise.