The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> how to run STB analysis with initinal condition
https://designers-guide.org/forum/YaBB.pl?num=1228375784

Message started by microant on Dec 3^rd, 2008, 11:29pm

Title: how to run STB analysis with initinal condition
Post by microant on Dec 3^rd, 2008, 11:29pm

Hi all

I want to run STB analysis in analog deign enviorment with initial condition, while, when I set some net with init value and check the output operation point, I find that the inital condition does not work.
Could anyone tell me how to add the initial condition when run STB analysis? thanks!

BR,
Lin :P

Title: Re: how to run STB analysis with initinal condition
Post by microant on Dec 8^th, 2008, 7:25pm

is there anyone know how to do it? thanks

B,R
Lin :(

Title: Re: how to run STB analysis with initinal condition
Post by pancho_hideboo on Dec 8^th, 2008, 9:56pm

microant wrote on Dec 3^rd, 2008, 11:29pm:

Could anyone tell me how to add the initial condition when run STB analysis?

Use "prevoppoint=yes" or "readns".

Title: Re: how to run STB analysis with initinal condition
Post by microant on Dec 17^th, 2008, 11:43pm

Hi pancho_hideboo

Thanks for your help!
I read the help for Spectre and try as you said. when I set "prevoppoint=yes" and add initial condition in the ADE, the OP is still not change. about the option 'readns', could you tell me how to setup it?

BR,
Lin

Title: Re: how to run STB analysis with initinal condition
Post by ACWWong on Dec 18^th, 2008, 12:05am

The way i would do this is:
1) set the order of simulation as dc stb (in ADE its Setup-> Analysis order)
2) in the dc options form click "force" to "all". This will make DC analysis force the initial conditions you set up in the schematic i.e. your initial conditions (Setup->Convergence Aids-> etc.)
4) in the stb options form click "prevoppoint" to "yes". this will now take the dcOp from the previous dc simulation which has been forced into taking the initial conditions

hope this helps
aw

Title: Re: how to run STB analysis with initinal condition
Post by microant on Dec 18^th, 2008, 6:53pm

Hi aw
thanks for your help!
I've got it as your suggestion.

BR,
Lin