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Flexible Noise Analysis in circuits with multiple RF Signal pathes

baenischifx

Hi all,

I'm currently working on the S-Parameter verification of a pretty big RF block that features one input and multiple

output ports. The input signal can be switched to different outputs, or even to multiple outputs using configuration bits.

S-Parameter simulations are fine but I have a problem with the noise part of the S-Parameter simulation.

The noise simulation is performed only between one output and one input port, which in principle is ok with me.

However I want to change the output port of the noise analysis with the configuration of my system, because the

output port can change with my signal path configuration.

I have already tried using a design variable outputport set to /PORT2 or /PORT3 and entered VAR("outputport")

and DESVAR("outputport") into the output port field of the sp-noise analysis. Unfortunatly this is not working.

Is there a possibility to vary the output port setting of the noise analysis ?

Best Regards

Andi

  • Hi Andi,

    This doesn't appear to be possible in the simulator even. The VAR() syntax is no good in this case, because ADE writes the VAR() into the netlist. It would never be DESVAR() because that's not a valid function. However, even if you try to just use a parameter name in that field, spectre is expecting the name to always be an instance name, and not the possibility for it to be a parameter with the value being an instance name (there's no parameter type that supports instance names as the value).

    So this isn't possible by any way that I can think of. You'll have to contact customer support to see about an enhancement request.

    Regards,

    Andrew.

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