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Design Languages >> Verilog-AMS >> Verilog A model for white noise source
https://designers-guide.org/forum/YaBB.pl?num=1264401024

Message started by Mayank on Jan 24^th, 2010, 10:30pm

Title: Verilog A model for white noise source
Post by Mayank on Jan 24^th, 2010, 10:30pm

Hi,
I am new to verilogA but am trying to write a verilogA model for white noise source...It isn't compiling...

My Code :---

Code:

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

module white_noise_source(p, n);
inout p;
inout n;
electrical p;
electrical n;

parameter real T = 200;
parameter real R = 10e3;
parameter real k = 1.38e-23;

V(p,n) <+ white_noise(4*'P_K*T*R,"thermal");

endmodule

The Compilation error is :--

Error found by spectre during AHDL compile.
ERROR (VACOMP-2259): "V<<--? (p,n) <+ white_noise(4*'P_K*T*R,"thermal");"
"/work/rf/white_noise_source/veriloga/veriloga.va", line
16: syntax error.
ERROR (VACOMP-1814): Maximum allowable errors exceeded. Exiting AHDL
compilation....

Could somebody pls explain this / correct this error ?? Or if somebody has already built a white noise source model...could you post it pls. ??

--
mayank.

Title: Re: Verilog A model for white noise source
Post by pancho_hideboo on Jan 24^th, 2010, 10:37pm

Mayank wrote on Jan 24^th, 2010, 10:30pm:

ERROR (VACOMP-2259): "V<<--? (p,n) <+ white_noise(4*'P_K*T*R,"thermal");"

Simply there is a typo.
It has to be :
V(p, n) <+ white_noise(4*`P_K*T*R, "thermal");

Title: Re: Verilog A model for white noise source
Post by Geoffrey_Coram on Jan 25^th, 2010, 6:49am

Pancho is right about the ' vs `

However, it looks to me that the compiler is actually complaining before that point, perhaps because there is no "analog" before the contribution.

analog
V(p, n) <+ white_noise(4*`P_K*T*R, "thermal");

or
analog begin
V(p, n) <+ white_noise(4*`P_K*T*R, "thermal");
end

(you'll need begin/end if you have more than one statement in the analog block)