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For IR drop best would be putting more power straps and if the power drop is small then u can widen the strap so that u meet the power.
For Dynamic IR drop first u try to dec the strength for the non critical paths(not a good practice as this might cause many timing violations). Best would be to put de cap cells but at the cost of more leakage and area.
My experince on the Static Ir is, adding additional stripe would only enhance the the design by 10 -20%, consider the switching factor is too high. but still gets reported of drop. Combinations of Decaps cells, and well planned power stripe would definately be plus.
In spite of all these, If drop still fails, Have an extra pad, and that would spin off the whole design again.
IR-Drop Solutions:
1. Reduce the current consumption of the cell
2. Add more supply voltage pads
3. Reduce the wire resistance
4. Use multiple power layers
5. Add decoupling capacitors
I dont think it will help u much in dec the drop in that area.
But if the drop margin is very small then u can try this also.
You need to add redundant vias for EM violations.
IR-Drop Solutions:
1. Reduce the current consumption of the cell
2. Add more supply voltage pads
3. Reduce the wire resistance
4. Use multiple power layers
5. Add decoupling capacitors
Capacitance in non-switching state that can source as well as sink current.Decaps filter out current spikes resulting from simultaneous switching of signals.
Decap Elements are Effective Series Capacitance (ESC), Effective Series Resistance (ESR)
@huckle: I think he means use more layers to supply power. Using more metal layers will reduce resistance of power network and hence IR drop.
@VENKATESHM: Decoupling capacitors acts as local charge storage and is helpful in mitigating the voltage drop at supply points by providing charge. It reduces current drawn from power supply and Hence IR drop.
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