Forum Post: RE: How to probe subcircuit currents in a .spf layout extracted Spectre APS simulation

Dear ci07, I am not sure if this is your issue as you note you are using a C only view to generate the netlist (and hence via resistances are not included), but you might check to make sure the supply nodes to subcircuits below the first level only have a single contact connection - which is highly unusual for any layout. Usually, there are multiple contacts and, as a result, probing the terminal of a subcircuit contained in an extracted view based netlist will not provide an accurate estimate of its supply nor ground current. In a schematic view based netlist, there is, of course, only a single supply and ground connection in most all cases and hence saving the terminal current does provide an accurate estimate of the current. Shawn