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How to use the 'gmin_check' option & set Option dc_pivot_check=yes

jdp721

Hi.

Two common warning messages obtained from Cadence ADE DC-analysis (also in Transient) are:

(1) "....Use the `gmin_check' option to eliminate or expand this report.

(2) "....Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence."

A screenshot of the simulation log showing this is attached.

Can you please tell how to set these options? I searched in the DC and Transient analyses Options window but couldn't locate any corresponding entity!

Thanks.

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  • Frank Wiedmann

    No, dc_pivot_check and pivotdc are not the same. Typing "spectre -h options" at the Unix command line shows

    119     pivotdc=no        Use numeric pivoting on every iteration of DC
                              analysis. Possible values are no and yes.
    120     dc_pivot_check=no
                              During DC analysis, the numeric pivoting is only
                              performed when bad pivot is detected. Possible values
                              are no and yes.

    In recent versions of IC616, dc_pivot_check appears in the form directly below pivotdc. However, as a workaround, you can enter dc_pivot_check=yes in the field "Additional arguments" under the Miscellaneous tab.

    Changing gmin_check will only influence the reporting in the log file but not the problem itself. I would recommend that you either leave it at its default value (which is max_v_only) or set it to all for an even more detailed report.

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  • Frank Wiedmann

    No, dc_pivot_check and pivotdc are not the same. Typing "spectre -h options" at the Unix command line shows

    119     pivotdc=no        Use numeric pivoting on every iteration of DC
                              analysis. Possible values are no and yes.
    120     dc_pivot_check=no
                              During DC analysis, the numeric pivoting is only
                              performed when bad pivot is detected. Possible values
                              are no and yes.

    In recent versions of IC616, dc_pivot_check appears in the form directly below pivotdc. However, as a workaround, you can enter dc_pivot_check=yes in the field "Additional arguments" under the Miscellaneous tab.

    Changing gmin_check will only influence the reporting in the log file but not the problem itself. I would recommend that you either leave it at its default value (which is max_v_only) or set it to all for an even more detailed report.

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