High order cascade multibit σΔ modulator for wide bandwidth applications

Author

Zouari, S. ; Loumeau, P. ; Loulou, M. ; Masmoudi, N.

Author_Institution

Dept. de Genie Electr. de l´´ENIS, Lab. d´´Electron. et des Technol. de l´´Inf., Sfax

fYear

2005

fDate

11-14 Dec. 2005

Firstpage

1

Lastpage

4

Abstract

A novel 2-1-1 cascaded sigma-delta I/Q modulator suitable for WCDMA applications is presented. The modulator employs multibit quantizer in the last stage and dynamic element matching (DEM) to attain high linearity over a wide band-width at an oversampling ratio (OSR) of 16. The DEM algorithm is introduced in such a way as to suppress in-band digital-to-analog converter (DAC) errors in the feedback of the last stage, thereby enabling the use of the highest resolution quantizer yet reported in a multibit cascaded sigma-delta modulator.

Keywords

code division multiple access; sigma-delta modulation; dynamic element matching; high order cascade multibit modulator; multibit cascaded sigma-delta modulator; multibit quantizer; sigma-delta I/Q modulator; wide bandwidth applications; Bandwidth; Delta modulation; Delta-sigma modulation; Digital modulation; Linearity; Multiaccess communication; Noise shaping; Quantization; Signal resolution; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2005. ICECS 2005. 12th IEEE International Conference on

Conference_Location

Gammarth

Print_ISBN

978-9972-61-100-1

Electronic_ISBN

978-9972-61-100-1

Type

conf

DOI

10.1109/ICECS.2005.4633447

Filename

4633447