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#decouplingcapacitors#bypasscapacitors#pcbdesign

#257: Power Supply Decoupling & Filtering: why we use multiple caps in different locations

w2aew

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Beginner. No background in the topic needed.

141K views9 years ago1 recommendation

HardwareElectronicsEmbedded systems

Alan Wolke explains why circuit boards use both bulk electrolytic and high-frequency ceramic capacitors for power supply decoupling and filtering.

This video talks about the different roles that the various power supply decoupling and filter capacitors serve on a circuit board. While the video doesn't cover how to select the values, it does illustrate and demonstrate why both "bulk" electrolytic caps and high frequency (usually ceramic) caps are used, and why they are placed where they are. There is a lot written about the topic of selecting values - google is your friend. Here is one good example which includes some good general guidelines: pdfs.semanticscholar.org/fe9c/29dde27b7afd7a893486fcfcc4c288… Here is a good extensive paper from Murata: murata.com/~/media/webrenewal/support/library/catalog/produc… Nice app note from Maxim: maximintegrated.com/en/app-notes/index.mvp/id/5450 Really good resource from Texas Instruments: ti.com/lit/ml/slyp173/slyp173.pdf

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What people say. Recommended as a clear explanation of why multiple decoupling capacitors of different values and locations are needed on a PCB.

u/phckopperin r/embedded • Recommends

On “A few questions on the minimum hardware for the STM32F3 MCU”

…powered, even if you're not using the DAC/ADC (section 1.1.1). 2. Yes, it can help but premature optimization is the root of all evil. For now, just tie them together and call it a day. If you have noise problems later you can add some filtering. 3. No, it's important that you use this scheme, there's a nice video by u/W2AEW explaining why here: [video Also, they recommend 100**n**F capacitors, not 100**p**F (but that's probably not the reason your board is not working). Also, beware of the decoupling recommendations for the VDDA/VSSA pair, you should follow them too. 4. Capacitors are not needed, but using a resistor (10k-100k) is nice because it allows you to "override" them in a pinch.…
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