Question on noise_table function in verilogA?

[neoflash]

Hello:

Some verilogA functions, such as noise_table, require a vector for content of the function.

For example, function noise_table(vector, noise_name).

The variable vector is required to be a two column vector, one is for frequency, the other is for noise power. Currently, I can only manually input the data points inside the noise_table function in below way:

noise_table({1,2,3,4},"name");

My question is that how I define this vector in a text file and load it into the verilogA model (inside hspice test bench).

Thanks,
Neo

 

[mengcy]

The syntax of noise table you could refer to this article.

https://www.designers-guide.org/Analysis/PLLnoise.pdf

There is an example at page 22

Good Luck!

 

[neoflash]

Thanks for the suggestion.
I understand the syntax of noise table. But I would like to define the data in a independent text file, and load it in verilogA model.

Can't find the doc on the related syntax.

 

[mengcy]

To do that First you create a cellview with veriloga-editor in the spectre,for example named "vco",and then "vco" will appear in the cell and "veriloga" will appear in the "view" box.
It's a text file you can edit with noise table function. When you exit the file the system will compile it . If no syntax error is reported then the system will ask if you want to create a symbol for the cellview.
Choose "Yes" you can edit the symbol.
Now you "load" the file to veriloga model!

Good luck!

 

[tom_s_ottawa]

To do that First you create a cellview with veriloga-editor in the spectre,for example named "vco",and then "vco" will appear in the cell and "veriloga" will appear in the "view" box.
It's a text file you can edit with noise table function. When you exit the file the system will compile it . If no syntax error is reported then the system will ask if you want to create a symbol for the cellview.
Choose "Yes" you can edit the symbol.
Now you "load" the file to veriloga model!

Good luck!

That is what I do... but what I would appreciate is some suggestions how to include diffrent noise_table for different frequency bands:

//pseudo code: start
if (freq < freq_1) V(out) <+ noise_table({ ... })
if (freq > freq_2) V(out) <+ noise_table({ ... })
//pseudo code: end

where freq, freq_1, freq_2 are passed as params.
Thank you in advance!