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Maestro - problem with sweeping a transistor parameter because of netlist format

frankp

Hello all,

When perform a designVar sweep analysis (be it in a "dc" or "ac" analysis) for the number of fingers of a transistor ("nf"), I get simulation results that do not make sense.

I was able to trace this down that each transistor macro cell has 2 netlist lines:

The 1st one containing all the basic info, gl, nf, m (not too many parameters)

And the 2nd one, where the real deep-dive netlist parameters of the said transistor exist. This 2nd line was generated as a consequence of the 1st line.

So basically when sweeping nf (number of fingers), the 2nd line of netlist will not be getting altered. Hence the wonky simulation results.

Is there an environment variable that permits the recreation of the netlist, even though the schematic does not change ?

Note: I am not sweeping the desVar through multiple corners, I doing so via the desVar sweep capability of a regular "dc" or "ac" analyses - In case I was not clear earlier.

Thank you

Frank

Cadence virtuoso version: IC23.1-64b.1SR9.24

  • Reason why I am not using multiple corners to sweep the design variable is that I need to have multiple corners too (80+ corners).

    So I want to bury the desVar sweep (of the transistor) in a series of multiple corners.

    Hence, I need something that forces netlist recreation, despite the fact that from a tool (meastro) perspective it does not make sense to have multiple netlist files (that should be identical)

    Frank 

  • in reply to frankp

    Correction:

    Even with using multiple corners to sweep a desVar (5 corners in this simulation), my simulation is still only generating only one netlist/netlist file (in the maestro/<history entry>/psf/<testname> directory. All 5 corners have their netlist/netlist linked to that said .../psf/<testname>/netlist/netlist file.

    What needs to be done to have a netlist/netlist file (not link) per corner ?

    Frank

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