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report a bug: laplace function does not support ac analysis (Read 2913 times)

nus_lin

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Posts: 48

report a bug: laplace function does not support ac analysis
Sep 22^nd, 2008, 6:16am

hello, guys.

i just found that if any branch is defined by laplace function, then its contribution will be ignored during ac analysis. can you tell me how to solve this problem?

example:

`include "constants.vams"
`include "disciplines.vams"

module S_gm(Vi,Vo);

inout Vi,Vo;
electrical Vi,Vo;

analog begin

V(Vo) <+ laplace_np(V(Vi),{1},{-p1,0});

end

endmodule

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sheldon

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Posts: 751

Re: report a bug: laplace function does not support ac analysis
Reply #1 - Sep 22^nd, 2008, 6:44am

It works fine for me. For a simple example
a constant term and frequency dependent
term got the attached results with the following
code

`include "constants.vams"
`include "disciplines.vams"

module test(Vi,Vo);
inout Vi,Vo;
electrical Vi,Vo;

parameter real p1=1 ;

analog begin

I(Vo) <+ 0.001 * laplace_np(V(Vi),{1},{-(2*`M_PI*p1),0});
I(Vo) <+ 0.001 * V(Vi) ;

end

endmodule

dg_example.png

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nus_lin Community Member Offline Posts: 48	Re: report a bug: laplace function does not support ac analysis Reply #2 - Sep 22^nd, 2008, 7:06am hi, sheldon, thank you. i tried your code too, but it doesn;t work in my machine. may i ask which design tools do you use?
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sheldon Community Fellow Offline Posts: 751	Re: report a bug: laplace function does not support ac analysis Reply #3 - Sep 30^th, 2008, 12:53am Nus_lin, Spectre Best Regards, Sheldon
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