In part 1 of my blog, we looked at the capabilities that the EDA tools provide in the area of supply network analysis. Now, we look at the different methods of power shut off control in the supply network.
Power Shut Off Control
The various methods used to control power shutoff switches each provide a way to control inrush currents and a way to indicate when a stable supply level has been achieved. Generally speaking, they approach the problem of minimizing peak inrush current by starting with a large power switch resistance (since I = V/R) and then gradually reduce the effective resistance as the difference in voltage across the power switch decreases.
Single power switch with an external timed delay – the simplest control with all switches turned on simultaneously and a simple external timer running to indicate when the transition is complete. This method can produce good results for very small domains that cannot generate enough inrush current to cause sagging and results in small implementation area and quick transition delay.
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