THE IMAGE-REJECT CONTINUOUS-TIME QUADRATURE BANDPASS SIGMA-DELTA MODULATOR

Nejmeddine Jouida, Chiheb Rebai, Adel Ghazel, Dominique Dallet

Abstract

This paper presents the design of an image-reject continuous-time (CT) quadrature bandpass (QBP) %Delta;%Sigma; modulator using a tailored signal-transfer-function (STF) design. The quadrature delta-sigma noise shaping with polyphase filter implementations and strategic IF placement effectively improve image rejection internally. The Fifth-order CT QBP %Delta;%Sigma; modulator planned for WiMAX and Bluetooth standards, illustrates clearly the totally elimination of image generation and the correctly signal process. This led to remove the baseband filter and PGA at the price of a very challenging ADC with merged-in cited functionalities. So, less analog components, low power consumption and high performance for the low-IF receiver.

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IMEKO-IWADC-2008-172.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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