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subciruit initiated top-level current probe

Kalimero

Hi -  I have a simulation issue that I've been unable to resolve. I am using: 

Spectre Circuit simulator Ver 6.2.1.207 - Cadence 5.0.0 - icfb.exe version 5.1.0

 What I'm trying to do is to probe a top-level branch current from within a Subckt (included as a spectre model library).

The subckt defines a bsource component. The bsource expression is a function of  current through component "V2" (vsource dc = 0) which is a analogLib component on the main circuit. 

The simulator interprets my probe i("V2:0") as current through a device that is internal to the subckt - hence it return an error everytime stating that I1.V2 is not found on the netlist. (I1 is the instance name of the sunckt-defined component). 

this problem does NOT exist when I use a voltage probe and specify any external nets.

I can get around this problem if I fake a ligitimate path for the current probe. For example if  I make it a function of current through a component that resides within a bogus subckt I have created and included in the circuit. i.e. i("I3.V2:0") works just fine ( I3 is the instance name of my bogus subcircuit componenet and V2 is a zero volt dc source within it. How can I do the same for a standalone analogLib component on the main circuit ... I would be grateful for any feedback. - thanks you    

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  • I'm not aware of any solution other than the workaround you've found.

    I plan to raise a CCR with R&D on this, as it ought to be possible to specify a top level source in the expression (maybe by putting ".V2:0" - although that doesn't work at the moment)

    Regards,

    Andrew.

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  • I'm not aware of any solution other than the workaround you've found.

    I plan to raise a CCR with R&D on this, as it ought to be possible to specify a top level source in the expression (maybe by putting ".V2:0" - although that doesn't work at the moment)

    Regards,

    Andrew.

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