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    About Author

    Jason J. Ellison

    Jason J Ellison received his Masters of Science in Electrical Engineering from Penn State University in December 2017.
    He is employed as a signal integrity engineer and develops high-speed interconnects, lab automation technology, and calibration technology. His interests are signal integrity, power integrity and embedded system design. He also writes technical publications for journals such as “The Signal Integrity Journal”.
    Mr. Ellison is an active IEEE member and a DesignCon technical program committee member.

    Most Recent Posts

    Getting Through a PCB DFM Check If you’re reading an Altium Blog, it’s probably safe to say that you’ve either designed or fabricated printed circuit boards. If you’re like me, sending a design to fab is a bittersweet experience. On the one hand, you’ll soon have your hands on the hardware you’ve been working hard to design. But on the other hand, you know the fabrication site is going to send a list of PCB DFM requests, and that’s never fun. In this article, we’ll discuss the Read Article
    Evaluating Concord Pro I’m working on several projects that require new PCB assemblies, and this presented a great opportunity to try Altium’s new product: Concord Pro™. Concord Pro is a component management system which makes component creation and organization much easier than using the current workflow. One of the PCB assemblies I need is a high-current voltage regulator that I will be using for a DC motor controller, and this is the PCB design I will use to Read Article
    Tricks of the Trade: Signal Integrity Devices As with any job, Signal Integrity engineers use niche tools. SI tools are often thought of as S-parameter viewers, 3D EM solvers, or measurement equipment. These tools have one thing in common: analysis. What about the devices that SI engineers deploy to make their lives easier? In this article, I’ll discuss three devices to save time and money: multiport test cables, RF switches, and the old RC filter. Multi-port RF Cable Assemblies Today’s high Read Article
    Reading Impedance Profiles of High Speed Backplanes Impedance remains a confusing topic in the signal integrity community. By definition, impedance is the ratio of voltage to current. That doesn’t really paint a clear picture to anyone. Getting more specific, the term impedance can mean several things. Step response of broadband reflection coefficient in ohms Impulse response of broadband reflection coefficient in ohms Time domain Z-parameters Frequency domain Z-parameters Signal Integrity Read Article
    Validation Structures for Signal Integrity Let’s say you’ve just received a populated switch or GPU PCB from your favorite PCB fabrication and assembly site. You sit down at your computer and start up your GUI or console to begin transmitting data.Trouble begins—the protocol to bring up the link isn’t working. What do you do? Checking the voltages and jumper positions is easy enough, but what about the signal integrity of your channel? Assuming that you did all of the required simulations Read Article
    Insertion Loss Deviation or Intersymbol Interference Noise? In a previous blog, I discussed how channel quality is quantified by eye patterns [1]. There, it is explained how eye patterns are created from the thru S-parameters only. So, if you are using the thru S-parameters alone, do reflections even matter? Intuitively, it would seem like they don’t matter since they are not directly used to calculate the eye pattern. But, of course reflections matter! Reflections cause signal integrity problems, and I’d Read Article
    Kramer-Kronig’s Relationship to PCBs The Kramer Kronig relationship is basically a way to go back and forth from the real and imaginary parts of a function. That’s it. So when someone says “blah blah blah must conform to the Kramer-Kronig relationship”, it’s a statement that is stating the obvious. Similar statements are, dogs must be part of the canine family and thus canis genus or petrol must have come from petroleum deposit on earth. Both correct and mildly interesting Read Article
    DFSI: Stripline Differential Impedance Calculation Made Easy As a PCB designer, you may hear your signal integrity overlords dictate controlled impedance with a specific value and tolerance. As someone who has requested these things, I know designers have trouble with implementing this in their trace geometry. This article details what impedance is, how it is calculated, and a practical way for PCB designers to determine the proper geometry for their application. When designing high-speed serial circuits Read Article
    DFSI: Overcoming Channel Loss In a previous article, we established that loss is one of the primary signal integrity challenges to overcome. In this article, we’ll talk about the sources of loss, what you can do about them, and an often neglected aspect of loss. There are various options for reducing loss, in this article I’ll discuss how to: Change your architecture to orthogonal or cables Use better PCB materials with lower DF resin and smoother copper Add active repeaters Read Article
    Design For Signal Integrity When we design PCBs, we start with setting up our Design For Manufacturing (DFM) rules in an EDA tool. However, it is likely that our Signal Integrity rules are the last thing we think about. In this blog, we’ll explore how to incorporate Design For Signal Integrity (DFSI) into our DFM routine. Design For Manufacturing Before discussing DFSI, let’s first review DFM criteria. The most driving criteria for DFM comes from the PCB’s IPC Read Article