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Weird netlisting problem with controlled sources

Finn

I met a weird problem when using controlled sources (vccs, vcvs, etc) from the analogLib. I have been using them for a while, then suddenly yesterday afternoon, all the controlled sources stopped working. The output current of a controlled current source is always 0, so is the output voltage of a controlled voltage source. I checked the netlist and found that the gain of the controlled sources were missing. For example, if I set the gain of G1 to 10, the netlist has "G1 (n1 n2 n3 n4) vcvs" instead of "G1 (n1 n2 n3 n4) vcvs gain=10".Does anybody know how this happened?Thanks a lot!

  • Either you filled in the wrong gain field - what do you have for Options->Tool Filter? Is it set to "spectre" - if so you should see the spectre "Gain" parameter - some of the other netlisters use a different property (also labelled Gain).

    Or you don't have the UNIX environment variable  $CDS_Netlisting_Mode set to Analog before starting Virtuoso. You'd need to do a Simulation->Netlist->Recreate after setting this env var and re-invoking virtuoso.

    Regards,

    Andrew.

  •  Hi Andrew,

     It's really the second case you mentioned. It turned out that in the beginning of my .cshrc file, there is a line referring to another account's file. Our CAD happened to remove that account yesterday, so that the shell initialization process will report an error at that line and ignore the rest part of the .cshrc file. That's why the $CDS_Netlisting_Mode is not set, which appears at the end of the .cshrc file.

    Thanks a lot for you help. I really appreciate it.

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