Stats

  • Locked Locked
  • Replies 2
  • Subscribers 125
  • Views 18971
  • 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

Bsource tutorial

IcoNem

Hi all,

I should try to use a bsource to model a VCVS with a given expression for the relation input-output. I should put in the expression the value of the voltage of a node of the net, how can I do this?

I have tried to put the name (Vtry) I gave to such node, but I get the following error:

Error found by spectre during hierarchy flattening.
ERROR (SFE-1997): "input.scs" 183: I46: parameter `bs_par_0': Cannot run the simulation because an unknown parameter `Vtry' has been specified in expression `Vtry'. Correct the expression and rerun the simulation.

Also I have not managed to find any tutorial for beginner about how to use bsource, if you know any would be helpful.

Thanks for your help

Parents
  • Andrew Beckett

    First of all, could you not just use a vcvs? Or maybe the "pvcvs" or "pvcvsp" component from analogLib? You should only need to use bsource if you have a sufficiently complex expression rather than a straightforward polynomial expression of a set of input voltages.

    You can find out more about bsource by typing "spectre -h bsource" at the UNIX prompt.  You can also find out about vcvs using "spectre -h vcvs" and pvcvs/pcvcsp (the latter is just a special symbol with a variable number of control inputs - underneath it's just spectre's pvcvs though) using "spectre -h pvcvs".

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    First of all, could you not just use a vcvs? Or maybe the "pvcvs" or "pvcvsp" component from analogLib? You should only need to use bsource if you have a sufficiently complex expression rather than a straightforward polynomial expression of a set of input voltages.

    You can find out more about bsource by typing "spectre -h bsource" at the UNIX prompt.  You can also find out about vcvs using "spectre -h vcvs" and pvcvs/pcvcsp (the latter is just a special symbol with a variable number of control inputs - underneath it's just spectre's pvcvs though) using "spectre -h pvcvs".

    Regards,

    Andrew.

Children
  • Andrew Beckett
    in reply to Andrew Beckett

    Oh, and giving the actual expression you'd tried to use would be a good idea as then a more specific suggestion could have been made as to what the problem was.

    Regards,

    Andrew.

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.