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Design Languages >> Verilog-AMS >> laplace_nd()
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Message started by flz on Aug 17^th, 2009, 8:12pm

Title: laplace_nd()
Post by flz on Aug 17^th, 2009, 8:12pm

Dose function laplace_nd() have only frequency character? What is the output of a transient sumulaion?Can it be used to model ideal filters directly?The manual dosen't give detailed description.

eg.
V(n) <+ laplace(V(p),[1.0],[1.0,0.001]);

Thanks! :-[

Title: Re: laplace_nd()
Post by Sumit Adhikari on Aug 18^th, 2009, 7:55am

No it dosent only have frequency. U can definitely use it for
transient simulation.It is called numerator-denominator form.
Following is a usage :

module test(pin, nin, pout, nout);
electrical pin, nin, pout, nout;
real nn[0:2];
real dd[0:2];
analog begin
@(initial_step) begin
nn[0] = 1.0;
nn[1] = 0.0;
nn[2] = 0.0;
dd[0] = 1.0;
dd[1] = 1.0;
dd[2] = 1.0;
end
V(pout, nout) <+ laplace_nd(V(pin,nin), nn, dd);
end
endmodule

It is meant to model your filters.

Regards,
Sumit