Re: noise_table question

Geoffrey,

Essentially, these are similar to what happens in table-models outside, 
i.e. when extrapolating. Would it be helpfull to have similar options, 
i.e. clamping (your option 2) or linear extrapolation, for the 
noise_table?

If I were to create a noise table I think I would like a linear 
extrapolation outside the table boundaries. Essentially, if I had a table 
with an 1/f noise in the lower frequencies of the table, I would like the 
noise to have that 1/f character also at frequencies lower than those in 
the table. Similarly, if I had band-limited noise that would descend with 
10dB/dec, it should continue to descend that way.

Marq Kole
Competence Leader Analog Simulation, Philips ED&T










"Geoffrey.Coram" <Geoffrey.Coram@analog.com> 
Sent by:
owner-verilog-ams@eda.org
20-03-2006 18:18

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VerilogAMS Reflector <verilog-ams@eda.org>
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Subject
noise_table question
Classification







Section 4.5.4.3 on noise_table specifies that linear interpolation
is used (presumably for frequencies inside the range of frequencies
specified in the vector).

What happens outside the vector?
1) value is zero
2) if the first pair is (fmin,val1), then for frequencies < fmin,
   the value is val1; similarly if (fmax,valn) is the last pair,
   then the value is valn for frequencies > fmax.

I propose (2).


Also, the LRM does not specify what a "vector" is.

-Geoffrey