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 Spectre (aps) simulation with extracted R only netlist 

Last post Thu, Jan 31 2013 12:47 AM by Frank Wiedmann. 1 replies.
Started by Sausage 30 Jan 2013 06:12 AM. Topic has 1 replies and 694 views
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  • Wed, Jan 30 2013 6:12 AM

    • Sausage
    • Not Ranked
    • Joined on Wed, Jan 30 2013
    • xxx, Cotes-dArmor
    • Posts 1
    • Points 20
    Spectre (aps) simulation with extracted R only netlist Reply

    We have an ADC in TSMC 65n

    Simulation with schematic is fine - works great.

    Simulation with extracted C (QRC) is fine - works great.

    Simulation with extracted R (QRC) - oh dear.....performance is terrible.

    Fair enough - could be crap layout - so I set all the extracted resistors to 0.001 ohm - I would expect it to perform the same as a schematic simulation - performance is still terrible ?

    The ADC is switched capacitor - checked operating points of relevent blocks - all in "right" place.

    It looks like spectre is removing various instances during topology check, so i used 'preserve_inst' to stop this. Performance is still terrible.

    The schematic (due to size) was run with 'liberal' as was the R extracted view. Changing to 'conservative' makes no difference.

    I even run spectre in 'non aps' mode. Same terrible result....

    I have looked at the ERC results....no soft-connects...

    Going quietly mad here.....

    Thanks.

    • Post Points: 20
  • Thu, Jan 31 2013 12:47 AM

    • Frank Wiedmann
    • Top 75 Contributor
    • Joined on Thu, Jul 17 2008
    • Muenchen, Bavaria
    • Posts 81
    • Points 1,270
    Re: Spectre (aps) simulation with extracted R only netlist Reply

    Comparing waveforms of one of your working simulations with those of your "terrible" one for important nodes in your circuit might help you identify the place where the problem occurs and guide your search for the cause.

    • Post Points: 5
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Started by Sausage at 30 Jan 2013 06:12 AM. Topic has 1 replies.