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# How to calculate the power stripes in encounter 10 points

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#### mujju433

##### Full Member level 3
I want the clear explaination who can explain me ??
with small examples

Plz do some research and explain me
Bye take care

hi mujju THis is deepa.. reply me immediately

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bye...

please let every one know . if u want to know the no of pairs needed or the width of power stripes.

In any case if u can do power analysis using voltage storm with Encounter or any other equivalent IR drop analysis tool you be able to calculate

Sing

Re: How to calculate the power stripes in encounter 10 point

Hi,

In general, you need to get current density allowed by the stripe metal layer, d info. from the foundry documentation (units A/m), the power voltage needed in your process (i.e. VDD if VSS = 0 volts) and an estimate of the power consumed by your design (I think the tools calculate this based on the cells used).

Roughly, the average current, Iave can be derived from the standard P = I * V formulae using the data above.
From this, we can get the total widths needed for the stripes using:
Iave = Total width of stripes * d .

So if total width of stripes needed is 100um and we want to use stripes of 10um width, then we need to use 10 stripes. However, if we calculate by saying we want to put 8 stripes only, each stripe should be at least 12.5um wide.

Since this calculation is a rough estimate, better add an extra stripe or widen by, say 10%.
A floorplan IR analysis will confirm if your stripes are sufficient.

Best regards.

Re: How to calculate the power stripes in encounter 10 point

Hi Cop2ia,

Could you please share some documents on power network design/floorplan.