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Simulators >> RF Simulators >> input/output impedence in Hspice
https://designers-guide.org/forum/YaBB.pl?num=1139398172

Message started by brandano on Feb 8^th, 2006, 3:38am

Title: input/output impedence in Hspice
Post by brandano on Feb 8^th, 2006, 3:38am

Hi all,

to calculate the input impedence of a RF circuit, in Hspice, is the only one way to make a .NET analysis?? I mean, whit just an .AC analysis I think it's impossible, because Hspice do not have the function to calculate the real part and imaginary part of an expression...........I suppose!

thanks,

davide

Title: Re: input/output impedence in Hspice
Post by Geoffrey_Coram on Feb 8^th, 2006, 5:38am

You can print the imaginary part of a voltage or current in an ac analysis:
.print ac vi(n1)

With a little creativity, you might be able to re-write your expression from imag(f(v(n1), v(n2), ...) into g(vi(n1), vi(n2), ...)