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Usage of variables belonged to different measurement functions in spectremdl

saikatc

Hi,

I am using spectremdl for measuring the performance of my analog circuits. During simulation, one variable is generated using the DC run and the other using transient run. I need to calculate a final variable using both these variables. Since they belong to different alias measurement block. The script is throwing error. Could you please suggest me a solution?

Example

alias measurement dcrun {

export real V_a

}

alias measurement acrun {

export real V_b

}

I want the following
export real V= V_a - V_b

  • yeh1

    Hi, maybe

    export real V = dc_run->V_a - ac_run->V_b 

  • saikatc
    Hi,
    Thanks a lot. It worked.
    Regards
  • saikatc
    Hi,

    Now that it went ahead. I am suddenly getting another warning message and the DC run is not happening at all.
    The message is as follows:
    Notice from spectre during DC analysis `dcrun', during task `MDLControl'.
    GminDC = 1 pS is large enough to noticeably affect the DC solution.
    dV(z) = 10.6691 mV
    Use the `gmin_check' option to eliminate or expand this report.
    Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence.

    Could you please suggest any solution?
    Thanks in advance.
  • Andrew Beckett

    Those are just warning messages - they shouldn't stop the DC from proceeding. I suspect there's some further messages which reveal more info. Can you post the entire spectre output log?

    Regards,

    Andrew.

  • saikatc
    Hi,
    I could debug the issue. The netlist generated didn't have the dc run information. As a result it failed.
    Thanks
    Saikat

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