[SI-LIST] Re: Electrolytic capacitors

Hi Vivek,

The inductance of any capacitor, whether bulk or high-frequency ceramic, 
plays a role
in creating the impedance profile of the power distribution network.  
The inductance
of bulk capacitors have to 'match' the capacitance of ceramic 
capacitor(s), assuming
that you have any, otherwise you get an impedance peaking.  Whether the 
peaking is a
problem or not, it depends on the application.

If you dont have the ESR of the electrolytic capacitors given in the 
data sheet, there is no
way to calculate it, but you could measure in a number of simple ways.

Regards,

Istvan Novak
SUN Microsystems


Vivek Kumar wrote:
> Dear All,
>
> I use Electrolytic capacitors to cater the voltage dip .
>
> I assume there shouldnt be a problem increasing the number of
> capacitors to meet the total capacitance requirement.
>
> Does the lead inductance of an electrolytic capacitor has any role to play.
>
> Hence my assumption is if i use 3 capacitors / 7 capacitors for
> example on the supply planes , it doesnt make a difference. Or is
> there complications.
>
> Please can anyone clarify.
>
> Also for an aluminium electrolytic cap, is there a way to calculate
> the ESR value if it is not not given by the manufacturer?
>
>
> Cheers
> Vivek.
>
>
>
>   

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