What’s driving the need for PCB power design?
I talk with a lot of customers about their designs and what’s needed to get their products out the door and for the most part, they have many of the same challenges across all industries. One of the...
View ArticleTired of waiting for your SPICE to finish?
Anyone who has ever had to simulate a SERDES interface knows how long it take to run a couple hundred bits through a SPICE model. Hours. Sometimes you have to kick it off overnight. And if you want...
View ArticleMaking SERDES sims faster with IBIS-AMI
You may have heard lately about IBIS-AMI models, which are being used more often for SERDES simulation. IBIS-AMI stands for I/O Buffer Information Specification Algorithmic Modeling Interface. These...
View ArticleS-parameters are for more than just packages
In the digital design world, we have typically only seen S-parameters used to model packages. They are a popular output of 3D field solvers like IE3D. But more and more, especially in SERDES design,...
View ArticleHow do you manage your trace lengths?
Too often I see people just using straight length to manage their board timing. Or take it one step further and turn length into propagation delay.You know, 1 inch is about 166ps. Which is true, but...
View ArticleVias are longer than their length
Yeah, that’s what I said. Vias are longer than their length. Phrased more appropriately, the delay introduced by a via has a lot more to it than just the length of the via. For starters, signals...
View ArticleThe length of your terminator doesn’t matter
Many designers go to great lengths to make sure they do appropriate length-matching, even to the level of including the lengths of their terminators (resistors) in their routing. Although this seems...
View ArticleCan you make Z higher?
Simulations should match measurements. Otherwise, what good are they? When doing signal integrity simulations, that starts with comprehensive stackup modeling. I quite often hear that stackup editor...
View ArticleMeasurement correlation is just a stackup away
Whether you are trying to correlate simulated waveforms to measured waveforms for a DDR3 signal, or board timing numbers for a simple SDRAM bus, or measured Z-parameters when looking at a PDN...
View ArticleIt’s never too late
It’s never too late to fix a design problem. Well, maybe if the product is shipping, that might be classified as “too late”. But during the design phase, whether you’ve laid out your board or not,...
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