Changing a group of parameters using Dynamic Parameter option available in .tran

There's no form entry to do a dynamic parameter sweep over multiple parameters, but it's easy to do with the help of an include file. The idea is that you can sweep over a paramset, and it's this paramset that you need to define in an external file.

So, create yourself a file called (say) paramset.scs (the name isn't important, but make sure that it ends in .scs so that it is interpreted in spectre syntax). Then have contents similar to this:

myset paramset {
  time errpreset      isnoisy avdd
  0    liberal        0      1.0
  100u conservative   1     1.0
  200u conservative   1     1.05
}

Then reference this file via Setup->Model Libraries in ADE. Now you have a paramset named myset available.

Rather than checking the "dynamic parameters" checkbox on the tran analysis form in ADE, go to the Options button on the tran form, and then the Misc tab. At the bottom, there's an additionalParams field. In here, type paramset=myset and this will tell transient analysis to sweep over these three parameters during the transient. You're changing errpreset (which affects accuracy), isnoisy (which allows you to turn on and off transient noise, assuming you've set up transient noise), and a design variable called avdd.

Hope that helps

Kind Regards,

Andrew.

hi,

if I want to run the following settings every 1ms, what should i do?

myset paramset { 
  time errpreset      isnoisy avdd
  0    liberal        0      1.0
  100u conservative   1     1.0
  200u conservative   1     1.05

}

regards,

fancy

hi,

if I want to run the following settings every 1ms, what should i do?

myset paramset { 
  time errpreset      isnoisy avdd
  0    liberal        0      1.0
  100u conservative   1     1.0
  200u conservative   1     1.05

}

regards,

fancy

Hi Fancy,

The forum guidelines ask you not to post on the end of an old thread as it muddies the response for anyone else searching for a solution.

Assuming that what you're asking for is a way to repeat the sequence every 1ms (so it returns to liberal with isnoisy off at 0, 1ms, 2ms, 3ms etc, to conservative with isnoisy on at 100u, 1.1m, 2.1m etc), then the only way of doing that is to expand out the table. 

This is a slightly odd requirement - will it really help that much (presumably you want to do this to speed the simulation up)? I suggest you contact customer support so that your exactly requirements can be discussed to determine if this would be the best approach or if an enhancement is needed for Spectre to provide a way to do this.

By the way, as a side note in this thread, during the IC617 hotfix stream, the tran analysis in ADE now supports defining multiple parameters on the form so there's then no need to create a paramset via an include file to achieve the variation of more than one parameter at once.

Kind Regards,

Andrew.