Time-interleaved oversampling A/D converters: theory and practice

Author

Khoini-Poorfard, Ramin ; Lim, Lysander B. ; Johns, David A.

Author_Institution

Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada

Volume

44

Issue

8

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

634

Lastpage

645

Abstract

In this paper, the design procedure and practical issues regarding the realization of time-interleaved oversampling converters are presented. Using the concept of block digital filtering, it is shown that arbitrary ΔΣ topologies can be converted into corresponding time-interleaved structures. Practical issues such as finite opamp gain, mismatching, and DC offsets are addressed, analyzed, and practical solutions to overcome some of these problems are discussed. To verify the theoretical results, a discrete-component prototype of a second-order time-interleaved ΔΣ analog/digital (A/D) converter has been implemented and the design details as well as experimental results are presented

Keywords

digital filters; sigma-delta modulation; signal sampling; switched capacitor networks; ΔΣ topologies; A/D converters; DC offsets; analog/digital converter; block digital filtering; design procedure; finite opamp gain; mismatching; second-order type; time-interleaved oversampling ADC; Bandwidth; Clocks; Digital filters; Digital modulation; Filtering; Linearity; Prototypes; Signal processing; Signal sampling; Smoothing methods;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.618037

Filename

618037