Design of hybrid continuous-time discrete-time delta-sigma modulators

Author

Kwan, Hing Kit ; Lui, Siu Hong ; Lei, Chi Un ; Liu, Yansong ; Wong, Ngai ; Ho, Ka Leung

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong

fYear

2008

fDate

18-21 May 2008

Firstpage

1224

Lastpage

1227

Abstract

Recent attention has been drawn to the hybrid Delta-Sigma (DeltaSigma) structure featuring the integration of continuous-time (CT) and discrete-time (DT) structures in the loop filter. It combines the accurate loop filter characteristic of a DT DeltaSigma modulator and the inherent anti-aliasing of a CT DeltaSigma modulator. We present a design methodology for building a CT-DT DeltaSigma modulator via the transformation from a DT DeltaSigma modulator prototype. We also demonstrate the tradeoff of applying this structure to cascaded Delta-Sigma modulators compared to pure CT or DT implementations.

Keywords

delta-sigma modulation; modulators; sigma-delta modulation; hybrid continuous-time discrete-time delta-sigma modulators; loop filter; modulator prototype; Clocks; Delta modulation; Design methodology; Electromagnetic coupling; Electromagnetic interference; Filters; Jitter; Noise shaping; Prototypes; Sampling methods; ADC; Sigma-Delta modulation; design methodology; oversampling;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

978-1-4244-1683-7

Electronic_ISBN

978-1-4244-1684-4

Type

conf

DOI

10.1109/ISCAS.2008.4541645

Filename

4541645