Hello,
I am currently working on the estimation of the electromigration of an FPGA.
We just performed the construction analysis so we know all the values of wire width and height for each metal line. From the data sheet, we also know the current consumption of the device.
We would like to estimate the electromigration lifetime for each metal line. In order to do so, I need to know the current density. Any idea how can I (roughly) estimate it, with the data I have available?
Thanks a lot
Dear Valeria,
welcome!
Just an idea and not a rigorous answer.
If you have the feed wires network which i think has its own metal layer, then you can distribute the total current among them where one can assume that the currents is distributed proportional to the cross sectional area.
In this way one can get the current in every wire and the current density.
One practical way is to acquire the magnetic field picture using hall generators array or any other areal magnetic sensors.
The current in the wire will be proportional to its magnetic field.
Precise current distribution can be obtained by specifying the loads on the bias lines according to the circuit block fed by this specific wire.
Hope these ideas will guide you to find the appropriate solution.
Best wishes
Dear Valeria,
welcome!
Just an idea and not a rigorous answer.
If you have the feed wires network which i think has its own metal layer, then you can distribute the total current among them where one can assume that the currents is distributed proportional to the cross sectional area.
In this way one can get the current in every wire and the current density.
One practical way is to acquire the magnetic field picture using hall generators array or any other areal magnetic sensors.
The current in the wire will be proportional to its magnetic field.
Precise current distribution can be obtained by specifying the loads on the bias lines according to the circuit block fed by this specific wire.
Hope these ideas will guide you to find the appropriate solution.
Best wishes
if we Know the current flow through the individual blocks , The current density is approximately estimated through by I/A, where I is the current flow through the block and A is the area of the conductor connects the specific block which may available the data sheet of FPGA
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