Voltus set_power command

Hello everybody,

I need to perform the rail analysis in a chip where I have several analogue blocks. The are two different typs of analogue macros, one is connected to AVDD, AGND and AVSS (le'ts call it macro_a), the other one has AVDD and four different types of grounds: AGND, DGND, AVSS and DVSS (let's call it macro_b).

I use the following commands to set a static power consuption in order to run the rail analysis:

set_power 2mw -cell macro_b -internal -pg_net AVDD
set_power 10mw -cell macro_a -internal -pg_net AVDD

AVDD rail analysis works fine, the total current flows through AVDD as expected.

But I have problems with the ground signals. I see that macro_a splits the total ground current into the two ground nets, while macro_b divides the total current by four (the current is equally distributed within the four ground pg nets).

I want to tell Voltus to use only AGND for all the ground current. But I don't know how to do it.

If I use the following scale factor, it works fine just for macro_a, while for macro_b I should use a scale factor x 4:
set_power -pg_net AGND -scale_factor 2

Please any help?

Thank you very much.