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how to run STB analysis with initinal condition (Read 4584 times)

microant Junior Member Offline Posts: 16 China,SH	how to run STB analysis with initinal condition Dec 03^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
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microant Junior Member Offline Posts: 16 China,SH	Re: how to run STB analysis with initinal condition Reply #1 - Dec 8^th, 2008, 7:25pm is there anyone know how to do it? thanks B,R Lin
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pancho_hideboo Senior Fellow Offline Posts: 1424 Real Homeless	Re: how to run STB analysis with initinal condition Reply #2 - 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".
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microant Junior Member Offline Posts: 16 China,SH	Re: how to run STB analysis with initinal condition Reply #3 - 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
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ACWWong

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Posts: 539
Oxford, UK

Re: how to run STB analysis with initinal condition
Reply #4 - 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

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microant Junior Member Offline Posts: 16 China,SH	Re: how to run STB analysis with initinal condition Reply #5 - Dec 18^th, 2008, 6:53pm Hi aw thanks for your help! I've got it as your suggestion. BR, Lin
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