The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> Flicker noise coefficients in 0.13um UMC process
https://designers-guide.org/forum/YaBB.pl?num=1222770317

Message started by manodipan on Sep 30^th, 2008, 3:25am

Title: Flicker noise coefficients in 0.13um UMC process
Post by manodipan on Sep 30^th, 2008, 3:25am

Hi Guys,
I want to have the numbers of flicker noise coefficients for both NMOS and PMOS in 0.13um UMC process.

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by manodipan on Oct 3^rd, 2008, 5:17am

Hi all,
I want 1/f noise coefficient numbers for 0.13um technology.If u guys don't have,pls suggest some procedure to get it from simulation...
Thanks

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by Geoffrey_Coram on Oct 3^rd, 2008, 6:01am

manodipan wrote on Sep 30^th, 2008, 3:25am:

Hi Guys,
I want to have the numbers of flicker noise coefficients for both NMOS and PMOS in 0.13um UMC process.

Umm ... shouldn't you be asking the foundry modeling group? Do you have Spice models for the process? It's probably a violation of some NDA for anyone to post those numbers on a public forum ...

And this thread probably belongs in "Modeling > Semiconductor devices"

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by Geoffrey_Coram on Oct 3^rd, 2008, 6:03am

manodipan wrote on Oct 3^rd, 2008, 5:17am:

If u guys don't have,pls suggest some procedure to get it from simulation...

Do you mean from measurement? If the numbers aren't in the model card, then you can't get them from simulation -- and if they are in the model card, then how does that differ from what you're asking for??

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by manodipan on Oct 4^th, 2008, 1:52am

Hi Geoffrey,
I actually have done simulation and in the noise summary of all devices there are some parameters like fn(for flicker noise ) and id(for thermal noise).Then from input squared noise at 1Hz,i can calculate flicker noise coefficient and it is of ~10^-14 V^2um^2 for PMOS.Surprisingly for NMOS it is lesser.But in literature it is reported that PMOS flicker coeff. is an order smaller than NMOS.Now here is my confusion...first the magnitude and then the similar order magnitudes for both PMOS and NMOS...can u pls clarify it??

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by Berti on Oct 5^th, 2008, 10:21pm

I not an expert... but I think that older technologies (the one textbooks are referring to) used PMOS transistors with buried channel. The flicker noise of those devices is lower compared to (surface channel) NMOS. However, modern technologies don't use buried channels anymore. Flicker noise of N- and PMOS is therefore similar.

Regards

Title: Re: Flicker noise coefficients in 0.13um UMC process
Post by Geoffrey_Coram on Oct 20^th, 2008, 1:04pm

manodipan wrote on Oct 4^th, 2008, 1:52am:

Are you measuring the current noise through a voltage source? Otherwise, the transfer function from the channel (where the 1/f noise is "generated") to the output, as well as the transfer function from the input source to the output, are involved. And if your input source for computing input-referred noise is on the gate, these transfer functions won't agree.

But I think Berti probably has the most important fact.