A 16bit ΔΣ modulator design with suppressing odd-order harmonic distortions

Author

Xu, Jia-Jing ; Liu, Yang ; Zhang, Shu-Ying ; Ding, Ling

Author_Institution

Coll. of Electron. Sci. & Eng., Jilin Univ., Changchun, China

Volume

6

fYear

2010

fDate

24-26 Aug. 2010

Firstpage

76

Lastpage

78

Abstract

In a ΔΣ modulator design process, the amplifier nonlinearity problem is usually neglected. However, nonlinearity problems will seriously affect the signal to noise ratio, but rarely discussed in literatures. In this paper, we model the problem and elaborate the importance of the coefficient selected. We design a folded-cascode op-amp with source-degeneration to suppress nonlinearity. The PSD analysis of the modulator output shows that the third and fifth harmonics are both less then -100 dB with the effective resolution up to 15 bit.

Keywords

delta-sigma modulation; harmonic distortion; harmonics suppression; operational amplifiers; ΔΣ modulator design process; PSD analysis; amplifier nonlinearity problem; folded-cascode op-amp; nonlinearity suppression; odd-order harmonic distortion suppression; signal to noise ratio; source-degeneration; word length 16 bit; Analytical models; Image resolution; harmonic; modulator; nonlinearity; source-degeneration;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer, Mechatronics, Control and Electronic Engineering (CMCE), 2010 International Conference on

Conference_Location

Changchun

Print_ISBN

978-1-4244-7957-3

Type

conf

DOI

10.1109/CMCE.2010.5609910

Filename

5609910