[SI-LIST] Re: Bulk capacitor decoupling
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Offir Assayag <Offir.Assayag@xxxxxxxxxxxx>
- Date: Sun, 28 Dec 2008 07:00:17 -0800
Offir, if you are just looking for a capacitance value only, then find
out where the VRM impedance reaches 70% of the target impedance, and
calculate the capacitance needed to match the target impedance magnitude
at that frequency. Manage the phase with ESR so as to avoid resonance
problems.
Steve.
Offir Assayag wrote:
> Hi,
> i have a high speed digital IC which its internal frequency is 300Mhz &
> 800Mhz.
> Its core voltage is 1.2v with ~3A current consuption.
> I am debating on which bulk capacitors to add.
> I added 0.1uF capacitors on each VCC pin , but i want to know how to
> calculate
> which bulk capacitor should i add to it.
> Need help.
> Thanks!
> offir
>
>
>
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