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High-Speed PCB Design
Simple solutions to high-speed design challenges
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High-Speed PCB Design
Confused About Differential Signaling or Clocks?
Check out this quick snippet of the Altium Podcast with guru of high speed design Lee Ritchey The primary reason that differential signaling is dominating the digital world is that far higher data bandwidths can be achieved over a pair of wires than with parallel, single-ended signaling protocols. The Internet as we know it would not be possible without differential signaling. This information is intended to clear up any confusion about
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EMI in Your High Speed PCB Design: Understand the Signal Rise Time
Learn more about your high speed design and how to deal with switching speed, rise time, and EMI in your high speed PCB layout.
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When Should You Use an Online Circuit Calculator?
Even if you’re an experienced engineer, you probably haven’t perfectly memorized every single formula you need to design PCBs and electronic devices. If this is true for experienced engineers, then what is a weekend warrior to do? Thankfully, there are many online calculators available that can help even novice designers build devices that meet industry standards. As you venture down the rabbit hole of designing a new electronic product, it
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Fly-by Topology for DDR3 and DDR4 Memory: Routing Guidelines
Banner image credit: Nine Dot Connects Take a look at your RAM chips the next time you're upgrading your desktop or laptop. If you need to, get the chip under a magnifying glass. Any traces you might see on the surface layer are just the beginning of a complicated web of traces between the edge connector and the RAM chips. Although the routing can get quite complicated, you can see a relatively simple topology when you take a 30,000 foot view of
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Differential Pair Impedance: Using a Calculator to Design Your PCB
Do you know what to look for in your differential pair impedance calculator? We've compiled the important information you need to know in this short guide.
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Termination Methods in High Speed and High Frequency PCBs
The topic of termination will inevitably come up when dealing with high-speed digital systems. Most digital systems have at least one standardized high-speed interface, or possibly fast GPIOs that produce fast edge rate signals. Advanced systems will have many standardized interfaces which also have termination applied, normally on the semiconductor die. If you determine that you actually need termination, what method should be used? As it turns
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Comparator Propagation Delay in High Speed Mixed-Signal Design
When I began my journey into the wonderful depths of electronics so long ago as a student, I wondered how so many interesting and important functions are built into everyday electronic devices. Input signal and voltages were fresh in my head and I was worrying more about a power supply than inverting inputs. It wasn’t until later that I started to fully understand the versatility of op-amps and how they could be used to build comparators
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PCB Layout Considerations: Differential Pair Length Matching Tolerance and Avoiding Violations
Detangling my daughter’s hair reminds me of detangling PCB traces. Everything needs to be set into layers, and crossover should be avoided. Detangling the hair of a 9-year old doesn’t take as long as routing PCB traces, but the results are just as painful if not done correctly. Ideally, though, your daughter’s hair isn’t causing short-circuiting of electronics or small fires to spark up. Routing traces in a layout is arguably the most important
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High-Speed PCB Design Analysis: Simulations and Signal Integrity Checks
High speed PCB design analysis is an admittedly broad area, comprising basic calculations of important design details, as well as simulations to verify a PCB layout. Some important evaluations are performed in the schematic, or at the very beginning of a design when a layout is being planned. These analysis techniques also have different levels of difficulty or advancement, and they will sometimes require an external program to fully evaluate the
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7 Benefits of In-House Fabrication and Additive Manufacturing
If you are like 98% of the PCB designers out there, you know what it can be like to run through the gauntlet of outsourcing a design to a third-party manufacturer to receive a prototype or two. The process is usually a little painful, often pricier than you’d have hoped, and leaves you waiting for longer than you’d expect. I often think that the manufacturing process is similar to going out to dinner at an overrated restaurant; you’ll wait on an
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Minimize Propagation Delay in Logic Gates: Synchronize Pulse Trains
When you have an analog watch, daylight savings time can wreak havoc in your personal and professional life. You might wake up and not even realize that you are an hour off schedule. No one wants to admit that they have fallen victim to daylight savings time, and your entire schedule has to resynchronize when this happens. Synchronizing your clock and your electronics components is critical in high-speed PCB design. Applications like bus trace
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Transmission Lines: Propagation Delay, Transmission Delay, and Analog Signal Resonance in Your PCB
Legend has it that opera singers can break champagne flutes just by wailing at the right note. From opera singers to the Tacoma Narrows Bridge, and the high tide in the Bay of Fundy in Canada, resonance can be a beautiful and simultaneously destructive phenomenon. The terms “transmission delay” and “propagation delay” are sometimes used interchangeably. In analog systems, both terms can refer to the time required for a signal to travel between
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PCB Design BOM Planning: A Balancing Act
The balancing act of knowing how much or little info is needed when designing your BOM is often convoluted and muddied. If done incorrectly, you could be stuck in a communication loop with a confused manufacturer, frustrated engineer, or a designer. This will inevitably cost you money, time and effort that otherwise would have been avoided. In order to assist us, today we’ll assume that you’ve begun to wrap up the final stages of your design, and
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Learning Current Density: Don’t Pop the Balloon
One area of PCB design that probably does not get the attention that it deserves is current density. Current density in a PCB trace is much like the pressure in a balloon. You want to squeeze as much air into the balloon as you can, but if you put too much: boom! The same is true of PCB traces many times. We want the traces to be as small as possible yet carry the most current possible, and if the trace carries too much: boom! For PCBs, that boom
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Paint by Numbers: Solder Paste Stencil Design Guidelines To Reduce Shortages
I’ve never had much artistic talent, but when I was a kid I loved those paint-by-numbers kits. Up until I saw those I’d only used watercolors, but I was enthralled with the thick, slow flow of the paint. I may also have killed some brain cells from breathing all the fumes. I was completely obsessed with keeping the paint in the lines, so I didn’t use the brush they gave you. Instead, I traced the outlines with a toothpick that had barely been
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Tips for Real-World PCB Design: Timing, Communication, and Traceability
I love food; I love the preparation, finding the ingredients, adding the minute adjustments of seasonings and salt, and cooking multiple courses at once. But when I first started cooking for myself, I prepared each part of the meal individually. I found it immensely difficult to keep track of the different dishes and ensure none stuck to the pan—or went without stirring for too long. So I sacrificed time and did each task individually. What my
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How the Right Tools in Your PCB Toolkit Can Help Your Next Design
When my sons were young, it was a joy for me to introduce and show them how to use tools for repair or construction. They would ask questions about the different tools in my toolkit, and my pair of old Channellock pliers really seemed to catch their interest. To tell the truth, those Channellocks are my favorite too. I inherited them from my dad, and still use them. They’re the first tool in my kit that I look for when I need to solve a problem
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