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How to generate Gaussian pulse in cadence spectre?

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rficdesigner

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Hello everyone,

Do you know the way to generate the Gausian pulse in cadence spectre?

Pls share for me, Thanks alot.
 

Hi, rficdesigner.
For tran analysis you can use verilog-A module


module gauss(out);
output out;
electrical out;
parameter real a=1 from (0:inf);
parameter real b=10n from [0:inf);
parameter real c=5n from (0:inf);

analog begin
V(out)<+a*exp(-pow($abstime-b,2)/2.0/pow(c,2));

end
endmodule


The result shown below

Regards, pavel.
 
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    Moossa

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Thanks you, pavel_adameyko

I have no experience on Verilog A.

I want to generate Gaussian pulse in Cadence Virtuoso Analog Design Environment.

I mean by adding components from build-in libraries to the Schematic file.

Do you know how to build a component that functions as the code you given ?

Waiting for your suggestions, thanks again.
 

It would be much more complex (I do not like the word "impossible"!) than the clever solution Pavel suggested.
 

I agree with JoannesPaulus - really don't know how to realize such circuit using standard components.
To create verilogA module just do
File->New->Cellview. In window choose Tool->VerilogA-Editor and type the name of module. The text editor window would appear where you can write the code. After completing just save and close text editor. The syntax will be checked and if it 's ok a window will appear to create symbol view of module. That's all.

Also you can use vpwlf component - but in this case you should write Gaussian function to file - don't think this method is simpler.

Regards, pavel.
 
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    rficdesigner

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    Moossa

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Hi Pavel,
What changes should I make to the above lines to generate a differential Gaussian pulse?
Thanks
 

It is quite simple, you just need to split the positive and negative halves:
Code: 
module gauss(p,n);
output p,n;
electrical p,n;
parameter real a=1 from (0:inf);
parameter real b=10n from [0:inf);
parameter real c=5n from (0:inf);
parameter real d=0;

analog begin
V(p)<+d+0.5*a*exp(-pow($abstime-b,2)/2.0/pow(c,2));
V(n)<+d-0.5*a*exp(-pow($abstime-b,2)/2.0/pow(c,2));
end
endmodule
You need to experiment for yourself, if you are interested in the basic concepts...
 

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