Re: Doubt about decoupling capacitors in high-freq PCBs
From: CWatters (colin.watters_at_pandoraBOX.be)
Date: 02/22/05
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Date: Tue, 22 Feb 2005 10:25:58 GMT
"Mayank Kaushik" <prehistorictoad2k@yahoo.com> wrote in message
news:1109051608.560608.153230@o13g2000cwo.googlegroups.com...
> Hi guys..
>
> One more thing..In such a design, is it absolutely necessary to use
> surface mounted caps?
Why not use them? They can be fitted by hand on prototypes.
> Whats the advantage these surface mounted caps
> have over normal ones?
They can usually be located closer to the pin that they are decoupling.
They make layout easier because you can run tracks underneath them.
> We have used only normal ceramics and
> electrolytic caps till now (both on the main board and the RAM board).
Electrolytic caps are only usually used at low frequencies. "Normal" ceramic
capacitors may not always have a good enough high frequency response.
> They seemed to work fine on the board, though i cant say anything abt
> the RAM
Define "fine".
Tried submitting your product for EMC compliance testing yet?
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