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R extraction in Assura

TIGRESS

Has anyone done R  extraction and verfied their designs ?

I dont understand how RCX extraction in Assura works?

I verified my opamp's gain through simulations and and after C extraction,the magnituded matched well except for the change in bandwidth .

but with R extraction,the magnitude of the gain of the opamp increased by 10db.How is that possible???parasitic R's will be in the range of ten's of ohms,how can they cause such huge change in the output impedanance??? 

Is the R extraction analysis correct??

 

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  • Andrew Beckett

    With correct technology data, R extraction should be very accurate.

    Did the addition of the parasitics cause it to move into a different operating region? Maybe it wasn't biassed right in the schematic case, and addition of the parasitics have moved some transistors into the saturation region (assuming it's MOS) and are then working more as intended? It's very hard to know what the cause could be without seeing the circuit.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    With correct technology data, R extraction should be very accurate.

    Did the addition of the parasitics cause it to move into a different operating region? Maybe it wasn't biassed right in the schematic case, and addition of the parasitics have moved some transistors into the saturation region (assuming it's MOS) and are then working more as intended? It's very hard to know what the cause could be without seeing the circuit.

    Regards,

    Andrew.

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