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Simulators >> Circuit Simulators >> ISF in hspice
https://designers-guide.org/forum/YaBB.pl?num=1242700194

Message started by raja.cedt on May 18^th, 2009, 7:29pm

Title: ISF in hspice
Post by raja.cedt on May 18^th, 2009, 7:29pm

hi,
can any body please tell me how to find Impulse sensitive function in hspice directly?I am trying to find isf by simply injecting impulse currents at different phase, but i am not getting correct ans.I am waiting for some one valuable reply.

Thanks,
Rajasekhar

Title: Re: ISF in hspice
Post by Geoffrey_Coram on May 19^th, 2009, 5:03am

Isn't the trick with ISF that you have to inject a pulse that's big enough to not get lost in the numerical noise, but small enough that you don't kick the oscillator out of its orbit?

Title: Re: ISF in hspice
Post by raja.cedt on May 19^th, 2009, 7:04am

hi
Geoffrey_Coram, thanks for your reply, how to decide the magnitude of the impulse?i heard that there is some direct method in hspice, if so can you please tell me how to do?

Thanks,
Rajasekhar.

Title: Re: ISF in hspice
Post by Geoffrey_Coram on May 20^th, 2009, 4:25am

Perhaps you mean the
.ACPHASENOISE

feature? I did a search on SolvNet -- I haven't used this myself.