Home > Community > Forums > Custom IC Design > noise analysis

## Email

Recipients email * (separate multiple addresses with commas)

Message *

 Send yourself a copy

## Subscribe

Intro copy of the newsletter section here, some intro copy of the newsletter. Instruction of how to subscribe to this newsletter.

First Name *

Last Name *

Email *

Company / Institution *

 Send Yourself A Copy

# noise analysis

Last post Mon, Feb 25 2013 11:49 AM by Anatoly2012. 4 replies.
 Started by surreyian 23 Nov 2012 12:51 AM. Topic has 4 replies and 974 views
• #### Fri, Nov 23 2012 12:51 AM

• surreyian
• Joined on Tue, May 17 2011
• Posts 19
• Points 320
noise analysis
 Hello, After running noise analysis, printed noise summary.I couldnt understand te Param info from the summary.What is fn, id, rs etc stands for?Is the total input referred noise = total summarised noise/gain^2 ?
Filed under:
• Post Points: 20
• #### Fri, Nov 23 2012 6:28 AM

Re: noise analysis
 fn is the flicker noise, id is the drain current noise, rs is the source resistor thermal noise, etc.Unfortunately the parameters are not yet documented (there's a request for this), but once you know the basics above it's fairly obvious what they mean (for a couple of more esoteric models it's less obvious, but in general it's clear enough).Yes, input referred noise is found by dividing by the gain (or gain^2) depending on the units. Essentially the simulator only computes the output noise, but because you told it where the input was, it can also compute the gain from input to output and use that to input-refer the noise.Regards,Andrew.
• Post Points: 20
• #### Wed, Feb 20 2013 4:09 PM

Re: noise analysis
 Hi, Any news on the documenting output parameters related to noise ?  Thx,Anatoly
• Post Points: 20
• #### Mon, Feb 25 2013 6:42 AM

Re: noise analysis
 Not as far as I know. I suggest you log a Case like I suggested to surreyian.Andrew.
• Post Points: 20
• #### Mon, Feb 25 2013 11:49 AM

Re: noise analysis
 Will do, thank you.Anatoly
• Post Points: 5