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Post layout simulation subcells power budget

PassGio

Hello everybody,

I have a design made of several different subcells; I wish to determine the power budget expected to be allocated to each cell while the chip is working.

I know I can measure voltage and current flowing into each cell selecting them from the schematic diagram, but my question is: is there a way to do the same also on an extracted view including the parasitics? I am able to select voltages on that view, but not currents. On the other hand ':pwr' signal in the results browser is referred to the total power consumption of top level cell, and it is not what I am looking for. I know I can run simulations on each subcell taken aside, but this way I miss the loading effects of the circuits connected to it.


How is it possible to make a current appear in the results browser, or to select it  on the extracted view? Is there a way to automatically get power consumption of lower hierarchical blocks?

Many thanks to anybody will help!

  • If you're asking how to measure the current into a block which is now part of a flat extracted view (i.e. a subblock of the flat extracted view), I'd say that is quite hard unless you can measure the current through a single device somehow. You could extract that subblock separately, rather than extracting the whole layout. Alternatively you could put a small metal resistor in the supply track for the block and then you can measure the current through that metal resistor - effectively you'd adding a probe point on the layout which will end up in the extracted netlist.

    Regards,

    Andrew.

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