third harmonic in sigma delta modulator's output spectrum

Status
Not open for further replies.
P

pankaj jha

Full Member level 3
Joined
Apr 16, 2010
Messages
170
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,298
Location
jaipur
Activity points
2,457
I am following the thesis " Look-ahead Sigma-Delta Modulation and its application to Super Audio CD".
In Chapter 2 (Basics of sigma-delta modulation) page 24 it is mentioned that -- "Typical distortion of an SDM consists of odd harmonic components, i.e. components at (2n + 1) · fin ." I can understand that since the quantizer is non-linear, making sigma delta modulator a non-linear system, odd harmonics prop in the spectrum of the modulator's output.
Can you suggest me the necessary papers/references which can provide me a detailed explanation of the above argument
 

There are different sources of non-linearity in a SD-modulator. The assumption, that you mainly see odd harmonics is of course based on prerequisites, generally speaking no even terms present in the polynomials describing the transfer characteristics of individual building blocks.

There's a paragraph about distortion in the simulation chapter of Nortsworthy, Schreier, Temes: Delta-Sigma Data Converters- Theory, Design and Simulation
 



Thanks FvM for the reference. Thanks a lot.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…