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ADE XL Monte Carlo analysis: statistical results are not available

Mike Tian

 Hi all,

     I'm new to ADE XL and I encountered a problem when running  Monte Carlo "Mismatch" only analysis (using IC61 and mmsim07.2). At the end of the simulation it always gives this error: Statistical results for Monte Carlo simulation are not available for the test. I checked the sim log file, it shows the simulation had no error, but it seems like for some reason the results are just not available.The "Detail" field in "Show Mismatch" window shows only "N.A.".

     Could this be due to some set up issue in ADE XL or the PDK model (IBM) i am using? I did go through IBM's reference, and their subckts do have mismatch models, I also have set the global switches in .scs file to enable mismatch.

     Can anyone help me on this? Thank you very much!

 

Mike

    

Parents

  • I've not tried running this in ADE XL (I had to throw something together to replace the veriloga model since I didn't have that), but I suspect that the problem is due to this:

    subckt p_mos D G S
    parameters W=10.0 L=5.0 F=5.0 NC=2 deltaVfb=0
    ...

    The bit in red probably shouldn't be there. The idea is that it is the global parameter which has the distribution (and mismatch then ensures that the variation is done per subckt instance). With this here (and it depends a little on how p_mos is instantiated, which I don't know from your example), the chances are that there is no distribution at all in this parameter, so it sees no statistical variation.

    I'm not sure about the mps error - what subversion of the IC tools are you using (type getVersion(t) in the CIW), and which subversion of the simulator (this will be listed in the simulator output log files near the top)?

    Also, I'm assuming  you were running "mismatch" and not "process" (or both) since your models only have mismatch variation.

    Andrew.

Reply

  • I've not tried running this in ADE XL (I had to throw something together to replace the veriloga model since I didn't have that), but I suspect that the problem is due to this:

    subckt p_mos D G S
    parameters W=10.0 L=5.0 F=5.0 NC=2 deltaVfb=0
    ...

    The bit in red probably shouldn't be there. The idea is that it is the global parameter which has the distribution (and mismatch then ensures that the variation is done per subckt instance). With this here (and it depends a little on how p_mos is instantiated, which I don't know from your example), the chances are that there is no distribution at all in this parameter, so it sees no statistical variation.

    I'm not sure about the mps error - what subversion of the IC tools are you using (type getVersion(t) in the CIW), and which subversion of the simulator (this will be listed in the simulator output log files near the top)?

    Also, I'm assuming  you were running "mismatch" and not "process" (or both) since your models only have mismatch variation.

    Andrew.

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