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High-Speed PCB Design
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High-Speed PCB Design
Ethernet Layout Routing Guidelines: MAC, PHY, and RJ-45 Connectors
Magnetics termination has little to do with actual magnets. Here are some important ethernet layout routing guidelines (MII, RMII, RGMII, etc.) to ensure signal integrity.
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High-Speed PCB Design: Just How Fast Is Fast?
As noted in several previous blogs, these days, “high-speed PCB” is pretty much ubiquitous in our industry. And, as cited, we always say that regardless of the end product or implementation every PCB is high speed by virtue of the IC technology incorporated in it. A few years back, we started saying that what was important was the edge rates of the components, or more specifically, the interconnections between the component edges and the boards
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Intro to High-Speed Design
TOPICS IN THIS SOLUTION Complicated PCB Design for High-Speed Applications High-Speed Constraints Are Used in Every Phase of the Design Process Analyzing the Design for Consistent Operation that Meets Specification You’re creating products that are made for the present day, which means moving past traditional PCB technology and design techniques. It takes more than innovation to perform these tasks well - how do you create high-speed interfaces
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PDS Design For Ultra-low Power Implementations
When it comes to low power implementations, products are characterized as very rarely having high current options, being small in size, being optimized for power management and having the necessity for batteries to last as long as possible. There’s a broad spectrum of products that fall under these criteria including, but not limited to, smartphones, smartwatches, remote monitoring devices and medical devices to name a few. In terms of PDS design
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Power Play—Successfully Designing Power Delivery Systems
Across the industry, the design element that continues to cause the most problems is the power delivery system (PDS). And, as a consulting firm, for the last several years the majority of problems that we have been called in to solve have always centered on PDS problems. As noted in my previous blog on guard traces and their ineffectiveness, every time we have been called upon to solve an EMI problem, we have always ended up fixing the PDS. This
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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
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Datasheet Reliability with Ben Jordan
In this OnTrack episode Judy Warner and Ben Jordan discuss about Datasheet Reliability. Can you trust them? And what does “Gilded” mean? This & more about verifying app notes. Watch the full episode.
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PCIe Card Guides: BGA Fanouts and Escape Routing
With all the chips that appear on a PCI or PCIe card, laying out and routing these boards might seem extremely complicated. However, the standardized architecture of PCIe provides considerable flexibility for designers. One issue that is a bit complicated is PCIe BGA fanouts for components on these cards. The trick to implementing a fanout and escape routing strategy is ensuring that you comply with the PCIe layout and routing specifications
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Series Termination Resistor Calculation
With transmission lines, some things never seem to be simple. Determining the termination technique and the values of components in a termination network shouldn’t be a difficult task. Most PCB design programs force you to look online for calculators, or you’ll have to run the calculations by hand. Instead, your design software should make it easy to test a range of component values in your termination network. Some components, traces
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LVDS PCB Layout Guidelines for Ensuring Signal Integrity
When you first get started in high-speed PCB design, you'll spend a lot of time encountering and understanding an alphabet soup of acronyms. MIPI, USB, PCIe interface, SATA PCB layout... the list of acronyms used to name high-speed digital interfaces is long. Low-voltage differential signaling (LVDS) is an older interface that was standardized for differential data transfer at high speeds, but it remains in use today for a variety of imaging and
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All About CMOS, ECL, and TTL Propagation Delay in High Speed PCBs
I still remember the 386 hand-me-down computer my parents gave me as a kid. It was useful for writing simple QBasic programs and spending hours playing computer games, but the computers of today leave my old 386 PC in the dust. With further development of computer architecture and the demands of more modern devices, the propagation delay in logic circuits becomes an important design parameter in a number of systems. In particular, TTL propagation
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Getting Your Layer Stack Right
An improper layer stack in your PCB design is one of the most common errors leading to fabrication failures and rejects. Every multilayer circuit board needs a precise PCB stack-up and accurate layout before it can be sent for PCB manufacturing. When you have the right set of circuit board design tools, you can turn your stackup into a real PCB layout and prepare the documentation your fabricator needs. The multi-layer PCB troubleshooting tools
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Tips for High Frequency PCB Design in Embedded Systems
Today's high-speed embedded systems incorporate diverse functionality, components, digital interfaces, and of course, wireless/RF signaling. If you're designing embedded systems with any level of computing power that also includes an analog front end, then you have multiple mixed-signal design challenges to overcome. Whether it's a simple sub-1 GHz radio connection, Wifi/BLE, or multi-gigabit Ethernet, embedded systems need some way to interface
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PCIe in PCB Design: Layout and Routing Guidelines
Opening up a computer as a kid and staring at the complicated mess of card slots, chips, and other electronics on a motherboard always made me wonder how anyone could keep all the details about PCB layout straight. Learning more about PCB design for computer architecture and peripherals made me appreciate the dedication PCB designers have for building great electronic devices. Modern GPU, USB, audio, and networking cards can all run on the back
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The Right Tools Will Help Your PCB Layout Time Estimation
To accurately know how to plan for your PCB design, you need the right tools to help with your PCB layout time estimation. ALTIUM DESIGNER Giving the most accurate results from a PCB design software out there. When exploring a new printed circuit board design, it is beneficial to estimate how long it will take to complete the layout. This will allow for production and test to be properly scheduled plus synchronize the release of the design with
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The Need To Control Routing Impedance
The design approach of controlled impedance routing is a key ingredient of high speed PCB design, in which effective methods and tools must be adopted to ensure the intended high speed performance for your PCBs. So unless you carefully design your routes within your PCB, the impedance would be uncontrolled, and its value would vary from point to point throughout the trace. And because your PCB traces don’t act like simple connections at high
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