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Reliability analysis issue - ADE L tool

EngTu

Hello colleagues, 

I designed a simple ring oscillator circuit using the GPDK045nm library provided by Cadence Online Support. 

Using the following tools on Cadence (ic6.1.6) - Spectre (12.1.1.096.isr12):

  1. Virtuoso schematic editor (IC6.1.6-64b.500.1).
  2. Lunch the ADE L tool to run Spectre simulation for:
  • Transient analysis.  
  • Reliability analysis. 

The transient analysis worked successfully and the waveform plotted using the ViVA XL tool.

The reliability analysis does not work correctly using both simulator modes:

  1. The RelXpert mode:

Error (RELXP-375): 

'The RelXpert simulator is unable to find 'RelXpert parameters in all model cards' to perform the calculation. Check if 'RelXpert paramters for some model cards' exists in 'input.scs' or 'correct syntax for reliability model or analysis is used in the netlist' before running the simulation again. Refer to RelXpert user guide for correct syntax. Failed to run RelXpert netlist preprocessing).

  1. The Spectre Native mode:

The waveform window should show some difference between stress and 10_years_aged but it is been overlapped. Also, in the ADE L tool - the Results -- Reliability Data is hidden. Here is the logout file warning:'Warning from spectre during transient analysis `rel-000_tran_stress', during Reliability Analysis `rel'.
WARNING (SPECTRE-16775): Can not generate the aged model because the aged device is missing or all device age values are less than the minage value in Spectre native reliability analysis flow'.

Q1) Do you know how the reliability models could be acquired and where should be added to the design before running the Spectre simulation?

I tried a different library and I received the same errors and warnings for the same circuit and others.

Q2) Is it possible to edit the netlist from the ADE L tool? I tried to edit a netlist from the netlist file but if I run the simulation, it will ignore what I typed and execute the options in the ADE L i.e. transient analysis stop time: 10n in ADE L and 15n in the netlist file. Spectre Simulation will execute the 10n as in the ADE L.

Looking forward to your prompt response.

Regards, 

  • Andrew Beckett

    I'd suggest using more recent versions and starting from the rapid adoption kit Reliability Analysis in ADE

    The gpdk045 PDK doesn't include reliability parameters, so is not a good bet to understand reliability analysis. I'm not sure why you're trying to edit the netlist - you can do that, but you would have to simulate it from outside of ADE because ADE will re-assemble the input.scs each time from the netlist and various other files (some of which would be re-built).

    Regards,

    Andrew.

  • EngTu
    in reply to Andrew Beckett

    Thank you so much Andrew for your help and suggestion.  

    Regards,

    Turki

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