[sdiy] 5V power supply for logic and uC

[Barry Klein]

There probably is not much reason to be too focused here - perhaps mainly worry about microcontroller things with HF clocks.  The goal is to put capacitance as close as possible to the IC pins drawing the current and keep the ground path short (cap to IC) as well.  Here's a good article I just came across:
http://www.intersil.com/content/dam/Intersil/documents/an13/an1325.pdf

.1uf ceramics are very common in SMT boards.  The ferrite beads may be a good idea if you are worried about RF emissions - but most hobbyists aren't.  They are also good to keep rf out of analog circuits.  These too are typically SMT.  They do have ferrite donut cores you could put on resistor/wire leads for through-hole things.
There is some debate about the cap bypassing - a HP paper recommends 3 values in parallel (see article).  I wouldn't worry about it - just look at the reference designs of any "special" chips you are using and see if they have such caps.  That usually is your minimum starting point.
With digital IC's put in the caps but try and find some good books on pcb layout to be sure you are following guidelines there.

Barry

>
On 02.11.12 16:05, Barry Klein wrote:
> Oh, and on your modules - use proper bypassing techniques for your 
> digital circuits.  This means you may have some low esr bulk 
> capacitance at the supply input but also be sure to have high 
> frequency suppression ceramics at the chips themselves.  Possibly add ferrite beads on chip VCC inputs too.

I'd be interested in reading up on these issues. I had a look at the chapter on low noise techniques and the section on interfacing analog circuitry to digital in Art of Electronics last night, but that did not satisfy my curiosity. A good book or paper/application note recommendation is very much appreciated.
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