Stats

  • Locked Locked
  • Replies 2
  • Subscribers 125
  • Views 5297
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

pss simulation - saving currents

JorisLambrecht

Hello,

when I do a PSS simulation (shooting) and try to plot the results in time 

domain (via Results - Direct Plot - Main Form - Function: Current), the node voltages can all be plotted but

the only some of the node currents are saved.

For instance, the currents through the inductors are saved but the drain current though a transistor is not:

ERROR: "/M0/D is not a kept output".

I can't find where it is defined which currents will be saved and which will not. 

I tried to add them to the "to be plotted" outputs manually, this doesn't work.

Then I tried pss - options - Output - save all, and outputtype "all", but the current still isn't saved.

Greetings,

Joris

Parents

  • Joris,

    When you say "this doesn't work" for using outputs "to be plotted", then it won't plot the currents - because the auto-plot  in this way only works for DC, AC and Transient analyses. However, if the save checkbox is checked, it should save the currents. So I'd like to know what doesn't work...

    Look in the netlist to see if there are save statements having done this (or Outputs->To be Saved). Saving all device currents is a possibility (in the save options form) but if the models are subckt models, this won't work because saving device currents only saves the currents for the primitive devices.

    I don't know which version of spectre you're using, but you may also need to turn on the "useprobes" option on the save options form - this is called something like "save ac currents" (I haven't got access to Virtuoso at the moment to check).

    Regards,

    Andrew.

Reply

  • Joris,

    When you say "this doesn't work" for using outputs "to be plotted", then it won't plot the currents - because the auto-plot  in this way only works for DC, AC and Transient analyses. However, if the save checkbox is checked, it should save the currents. So I'd like to know what doesn't work...

    Look in the netlist to see if there are save statements having done this (or Outputs->To be Saved). Saving all device currents is a possibility (in the save options form) but if the models are subckt models, this won't work because saving device currents only saves the currents for the primitive devices.

    I don't know which version of spectre you're using, but you may also need to turn on the "useprobes" option on the save options form - this is called something like "save ac currents" (I haven't got access to Virtuoso at the moment to check).

    Regards,

    Andrew.

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.