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Plotting gm Vs. time from PSS simulation (6.1.5-64b.500.11)

MicheleA

Hi all,

yes...there is this support answer #11003524 which should address the topic.

I also learnt from Andrew some time ago about saving oppoints and/or specific info through a file and attaching it to the model libraries.

What I am experiencing now is that the method:

a) gives me the info out of a *tran*

b) gives me the info out of a *envlp_td* 

c) for a *pss*, I get

1. a _constant_ value in the *pss_td* folder, if I use the shooting method (seems like a DCOP value)

2. nothing if I use the HB method

Just wondering whether that is the behavior to be expected, or shouldn't I get a (nice) plot of my wanted gm over a period, exactly like I get it for any other V/I in the circuit after a pss?

I seem to remember having done the same thing some 6 months ago and it worked fine..

Thanks for any help.

Michele 

  • MicheleA said:

    I also noted that the whole sim setup is waaay faster when using cmd line. Ok, the circuit is two transitors but I got the impression that the processes *before* actual simulation took a fraction of the time.

    Can you please point me to the help entries containing - possibly an overview - of topics like 'running Spectre from the command line' and directory structure...things like that.  Maybe the time has come for me to understand all this a little better.

    Hi Michele,

     

    Oh no! What have I done? ;-)

    The actual simulation will be the same time - it's doing the same thing - but you've eliminated the overhead of starting the ICRP job, netlisting, managing the job and so on. There's been quite a bit of work on optimizing that recently though, so should be less significant in recent IC616 ISRs, at least for the case of having large numbers of jobs.

    As for running spectre from the command line, this is covered in the Spectre User and Reference manuals. Also "spectre -h" is your friend...

    As for the actual issue, it must be something to do with some other setting in your example - I don't know what that might be (without seeing the example).

    Kind Regards,

    Andrew.

     

  • LOL!

    Do you think you could start something if I attached the netlist...well..stripped of the actual devices and just options and simulations?

    I'd be more than happy to do that :)

    Cheers,

    Michele 

  • Ideally if you can include the transistor instances, and just omit the model files - presumably you can reproduce this with a simple circuit (similar to my inverter) - and also the options and analysis statements included. Then I can replace them with some other models and see what happens.

    Cheers,

    Andrew.

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