EEVblog #1216 - PCB Layout + FPGA Deep Dive

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Only Dave can turn a simple question into a 1hr deep dive monologue into PCB layout and FPGA implementation.

FPGA power supplies, DC margins, dynamic power requirements, power budgets, high power designs, multi layer PCB design, placement, system considerations, power planes, copper weighting, stackups, routing, split planes, star grounding, blind and buried vias, high speed traces, return paths, EMC, and a whole lot more.

#FPGA #PCB #Design

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Damn, Dave. The wealth of knowledge you posses is unreal. I think of myself as a pretty good layout person, and I've done layouts for some ARM chips that I've been very proud of. But I have never thought about this kind of stuff. Of course, I've never worked with tolerances tighter than a frog's ass either. Your viewers are orders of magnitude better at not just PCB layout, but electronic design in general after watching this video! You, sir, are legend!!

testep

This video brings back memories for me. In the early 2000's I worked at a company that used massive bleeding-edge FPGAs in dozens of products. I was literally the only analog guy in a sea of digital and software engineers. One of my main jobs was to unscrew the bad layouts for dozens of point-of-load buck converters that made local supply rails for the FPGAs. Before I hired on the local Linear Tech FAE was constantly designing custom converter circuits for this company. (They kept him so busy that he practically lived there and he was SOOOO happy when they hired me.) But the LT guy just gave them the schematic for each converter, and didn't oversee the layouts, so it was pretty bad in terms of noise, step response, and EMI. (BTW, tweaking the compensation to get the best step-load response can make a big difference in terms of keeping a rail within the limits.) My other big tasks were: finding and fixing impedance discontinuities; reducing clock jitter and skew; and solving thermal problems.

steverobbins

Electronics always just tears my brain up in a thousand prices. The only difference between this video and my professor ist that the this video makes me actually want to understand it all.

80% of the time a video on YT will teach you more than a 2 hour lesson. I love the enthusiasm.

alex_inside

Dave @ 35:23 "I can do a video on every single one of these properties"
Ooooh yessss, please do :)

davidgustafik

I think this is the most valuable video from Dave I've watched so far. A big thank you Dave for sharing your knowledge!

tangerinq

Can you imagine Dave doing the PCB layout on a big complicated board? He must lie awake at night with his eyes wide open for weeks!

Graham_Wideman

This DC ground impedance stuff is exactly what makes good audio equipment design tricky. When you need greater than 100dB integrity on a 1v signal, yet have 10A dynamic current draws on the same circuit.

Lower frequency than this FPGA stuff of course, and generally less complex.

Audio_Simon

Please do more of these types of videos, they're great.

SteveMHN

I did not know that the Vdds are so narrow for different purposes in an FPGA. Thanks for the interesting video, Dave.

youriklaassens

Love the deep dive! Whacking a micro and some LEDs and connectors on a PCB is fun, but "real" PCB design with complex devices is a different animal. This gives me a much better appreciation of some issues I was only vaguely aware of.

bitrot

I love these PCB design videos. They are extremely educational and hands on. Great vid Dave!

foreverAnkh

We need to go deeper! Let's also talk about separating dirty digital power and sensitive analog power :)

xDevscom_EE

Nice video, would love to see more of this style of videos on other topics of real pcb layout.

Gengh

They also added the wires to move the high current rails away from the FPGA signal wires. Magnetic interference introducing signals into the signal wires.

WXSTANG

PCB design becomes 10x more difficult especially on a board like that when someone dictates connector position. Those wires were to not only keep the conduction losses (heat) off of the board but to maintain a clean ground plane for the high speed return paths

Pops