Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Dithering to increase SNR [MATLAB]

Status
Not open for further replies.

stenzer

Full Member level 4
Joined
Oct 1, 2012
Messages
204
Helped
23
Reputation
46
Reaction score
22
Trophy points
1,298
Activity points
3,105
Hi,

I'm currently evaluating my measurement hardware by means of its SNR behaviour. The circuit is designed to digitize a DC voltage. For test proposes I'm using a constant DC voltage.

To increase the SNR for low analoge signal levels, I'm performing an averaging. This works as expected for low input signal amplitudes (low SNR) e.g. 100 samples +20dB SNR, 1k samples +30dB SNR and so on.
What I have noticed, there is an "upper" limit. At this point the SNR doesn't increase by increasing the number of averaged samples. By having a look on the histogram of my raw (non-averaged) samples, there is a low number of gaussian distributed pins/frequencies.

In my opinion the SNR can not by increased at this point as the deviation of the data is too low. So I think, a possebility to increase the SNR further would be dithering. Has anyone performed dithering in MATLAb so far? Would white gaussian noise with an amplitude of +-1/2 LSB be sufficient, or are there other distributions with a better performance?

BR
 

FvM

Super Moderator
Staff member
Joined
Jan 22, 2008
Messages
46,779
Helped
13,886
Reputation
28,020
Reaction score
12,523
Trophy points
1,393
Location
Bochum, Germany
Activity points
272,992
You rather want an uniform than a gaussian distribution for the dither signal.
 

stenzer

Full Member level 4
Joined
Oct 1, 2012
Messages
204
Helped
23
Reputation
46
Reaction score
22
Trophy points
1,298
Activity points
3,105
Hi FvM,

thank you for your reply.

So I will use an uniform distribution.

THX
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search


Welcome to EDABoard.com

Sponsor

Sponsor

Design Fast


×
Top