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Problem in Cadence Virtuoso AC analysis

OneNewBoy

Hi all,

I am facing an often discussed problem  while simulating a differential pair in cadence virtuoso.

Though I have biased the transistors through DC  (though they are in subthreshold mode), yet when I try do do ac analysis (I follow all regular steps) I get a zero magnitude at output. Ths schematic is attached.

Can someone help me in debugging this ?

 

 

Parents

  • Actually, spectre will linearize your VerilogA model and simulate that in the AC analysis. You should not have to write an explicit AC model (and in fact you can't really). Not sure what your model looks like, but maybe you've written it in a way that can't be transformed into a small signal model?

    Regards,

    Andrew.

Reply

  • Actually, spectre will linearize your VerilogA model and simulate that in the AC analysis. You should not have to write an explicit AC model (and in fact you can't really). Not sure what your model looks like, but maybe you've written it in a way that can't be transformed into a small signal model?

    Regards,

    Andrew.

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