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Cadence SKILL/Ocean loading and saving dc operating point in dc sweep simulation

MatthewT

Hi,

I looked into web and cadence manuals, but I cannot find the answer to my question. I think I saw it some time ago on our forum here, but I cannot find it right now.

I'm running dc simulation:

analysis('dc ?dev "/voltage_dc_source"  ?param "dc"  ?start "value_low" ?stop "value_high"  ?step "1m" )
envOption(
          'analysisOrder  list("dc")
); envOption
run()


I would like to have faster convergence. I found following commands:
- write
- writefinal
- readns

I can run .tran simulation with "?writefinal" attribute pointing to the file where .op of the circuit will be saved and then load it for dc simulation:

analysis('tran ?stop "500n" ?writefinal "tran.fc")
envOption(
    'analysisOrder  list("tran")
); envOption
run()

(...)

analysis('dc ?dev "/voltage_dc_source"  ?param "dc"  ?start "value_low" ?stop "value_high"  ?step "1m" ?readns "tran.fc" )
envOption(
    'analysisOrder  list("dc")
); envOption
run()    


however in such a case, every dc simulation uses the same input tran.fc file. The question is, is it possible to:
1. run 1st dc sweep
2. save calculated dc operating point
3. start 2nd sweep
4. load dc operating point from the 1st sweep
5. run 2nd sweep
6. save dc operating point of 2nd sweep
7. and so on ...

?

Parents

  • Hi,

    It looks as though you want to run a certain number of DC operating point analyses (I'm not sure if this is fixed or could be variable) but you might want to run your steps in a loop (for, foreach, while) something like the following:

    ;; initial DC op run first, before this loop
for(i 1 3
  analysis('tran ?stop "500n" ?writefinal sprintf(nil "tran%d.fc" i))
  envOption('analysisOrder  list("tran")); envOption
  run()

  (...)

  analysis('dc ?dev "/voltage_dc_source"  ?param "dc"  ?start "value_low" ?stop "value_high"  ?step "1m"
    ?readns sprintf(nil "tran%d.fc" i))
  envOption('analysisOrder  list("dc")); envOption
  run()
); end of for loop

    The file name is generated depending on which iteration you are on.

    Hopefully this is helpful to you.

    Regards,

    Lawrence.

Reply

  • Hi,

    It looks as though you want to run a certain number of DC operating point analyses (I'm not sure if this is fixed or could be variable) but you might want to run your steps in a loop (for, foreach, while) something like the following:

    ;; initial DC op run first, before this loop
for(i 1 3
  analysis('tran ?stop "500n" ?writefinal sprintf(nil "tran%d.fc" i))
  envOption('analysisOrder  list("tran")); envOption
  run()

  (...)

  analysis('dc ?dev "/voltage_dc_source"  ?param "dc"  ?start "value_low" ?stop "value_high"  ?step "1m"
    ?readns sprintf(nil "tran%d.fc" i))
  envOption('analysisOrder  list("dc")); envOption
  run()
); end of for loop

    The file name is generated depending on which iteration you are on.

    Hopefully this is helpful to you.

    Regards,

    Lawrence.

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