Does anyone have experience in modeling flicker noise in Verilog-A for use in transient simulations?  
I hace to model it .
My simulator is Spectre.
Any ideas would be greatly appreciated.  

  Thanks !

But I still don't understand what you mean.

flicker_noise() can only be valid in AC simulation. It is not work in transient simulaiton


Please help me more!!!


Thanks

zjuyifeng wrote on Jul 31^st, 2007, 5:40pm:


That's not actually true -- it doesn't work in a standard Spice transient analysis, but standard Spice doesn't know anything about transient noise.  The Verilog-AMS LRM should probably have something to say about this.  But my point is: flicker_noise() *does* work in transient noise analysis; try an example and see what you get!

Code:

// mynoi.va
module mynoi(a,b);
  inout a,b;
  electrical a,b;
  analog
    I(a,b) <+ V(a,b) + flicker_noise(1000, 1, "flicker");
endmodule
 

Put this in a netlist with a current source driving it, run a transient noise analysis.

Are you using a current version of Spectre?

The question is "Are you using a recent version of Spectre?". Both the fracpole and Geoffrey's suggestion require a relatively recent version of Spectre.

To test to see if Spectre supports fracpoles, type "spectre -h fracpole" into a unix command line.

-Ken

Did you try flicker_noise() in a time domain noise simulation?  Of course, time domain noise is also a somewhat recent addition to Spectre, and maybe they didn't get the Verilog-A flicker noise implemented in the first go-round, but it does work for me in my version of Spectre (which also has fracpole ...).