The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Modeling >> Behavioral Models >> Transient flicker noise model in Verilog-A
https://designers-guide.org/forum/YaBB.pl?num=1138035305

Message started by Rob Mehregan on Jan 23^rd, 2006, 9:04am

Title: Transient flicker noise model in Verilog-A
Post by Rob Mehregan on Jan 23^rd, 2006, 9:04am

Does anyone have experience in modeling flicker noise in Verilog-A for use in transient simulations? We have modeled noise in the past using the random function in combination with an S-domain filter on the output. However, the designer has asked for noise with a lowpass characteristic of 10 dB/dec rolloff. I am not sure how to easily model this in Verilog-A. Any ideas would be greatly appreciated.

- Rob

Title: Re: Transient flicker noise model in Verilog-A
Post by Ken Kundert on Jan 23^rd, 2006, 10:36am

In Spectre you can use the fracpole component to create an impedance that exhibits a half-pole rolloff over a pre-specified range of frequencies. If you are not using Spectre, you can use the fracpole suite available from this website (http://www.designers-guide.org/Modeling/fracpole.zip), but you will have to convert the netlists to be compatible with your simulator.

-Ken

Title: Re: Transient flicker noise model in Verilog-A
Post by Rob Mehregan on Jan 23^rd, 2006, 12:45pm

Thanks, Ken. :) I tried it in Spectre and that looks like a fairly straightforward method to generate the lowpass filter with 10dB/dec rolloff.

- Rob