Spectre stability analysis with active device as probe

Hi,

this is a very nice feature, because sometimes you cannot insert a probe into the schematic. And in the past it worked fine for me in most pdks.

However, now I have problems, that the active device is not recognized correctly. If I use it from GUI and cross-probing, I got this netlisted:

stb4 stb  start=1 stop=1G dec=10 probe=DUT.M41 annotate=status

But this does not work.

I believe the problem is that M41 transistor model is a subckt with device m1 inside which is the active element. So I changed the netlist to this:

stb  stb  start=1 stop=1G dec=10 probe=DUT.M41.m1 annotate=status

But I get the same error message in Spectre (remark: the M41.m1 syntax works fine for DCOp like to get vdsat).

Also this is not working:

stb4  stb  start=1 stop=1G dec=10 probe=DUT.M41.m1.gm annotate=status

So I run out of ideas, can anybody help?

Here are the error messages:

Error found by spectre during STB analysis `stb'.
    ERROR (SPECTRE-16418): Invalid probe instance. Possible choices are iprobe, vsource, or supported active device.

Analysis `stb' was terminated prematurely due to an error.

Error found by spectre.
    ERROR (SPECTRE-16850): Invalid instance name `DUT.M41.m1.gm' is specified as value for the 'probe' parameter in stb analysis. Ensure that the instance name is specified in the netlist or specify the correct instance name in stb analysis.

Analysis `stb' was terminated prematurely due to an error.

Error found by spectre.
    ERROR (SPECTRE-16850): Invalid instance name `DUT.M41' is specified as value for the 'probe' parameter in stb analysis. Ensure that the instance name is specified in the netlist or specify the correct instance name in stb analysis.

Bye Stephan