Help me calculate the power ring and power straps widths

power planning

hi
can any one help me in calculating the power ring width and power straps width and no of power straps using the core power consumption..

Can any one share any documents regarding this power planning....

Thanks in advance..

Regards
Shankar

Re: power planning

Hi Shankar ..
Can you please explain power ring ? I know that power mesh is made its width are predefined. But this mesh is made in top metals and is widely discussed in literature.

power planning

Hi Shankar
you should calculate the power consume of the chip by the eda tools such as the voltage storm or power meter

Added after 8 minutes:

with the equation P=UI ,so get the I value of the chip
the IR drop max value decide the resistance-- R,
so u can calculate the square resistance . U will get final numbers of strap

Re: power planning

"CALCULATION OF CORE RING WIDTH"

This involves following steps

a) The width and height of the core area is obtained from estimation sheet
b) Current at the top/bottom and left/right is determined by the following equations
Itop = Ibottom = { Ict * [ Wc / (Wc + Hc)] / 2}

Ileft = Iright = { Ict * [ Hc / (Wc + Hc)] / 2}

Ict = Total core current
Wc = Width of core
Hc= height of core

Depending on the EM limit the total width of the stripe of metal required is
calculated.

Total width of top and bottom = Itop/EM limit
Total width of left and right = Ileft/EM limit


WIDTH DETERMINED BY IR DROP

It is required that the IR drop should be less than 5% VDD
IR drop = I*R

R =R0*(L/2)/W
L/2 is chosen because the drop is maximum here

Hence W= I {*R0*(L/2)}/0.005*VDD

Which ever width is limiting that is taken as the core ring width