NDLI: A one-path subsampling quadrature receiver based on a ΣΔ modulator with distributed resonators

Content Provider	Springer Nature Link
Author	Prefasi, E. Reekmans, S. Hernández, L. Rombouts, P.
Copyright Year	2011
Abstract	This article presents experimental results of a quadrature bandpass sigma–delta (ΣΔ) modulator based on distributed resonators. The modulator employs transmission lines and transconductors as main components and does not require switches in the loop filter as in the case of switched-capacitor (discrete-time) filters. In addition, the proposed complex modulator does not require a quadrature mixer in the receiver. As main feature, the modulator architecture introduces an innovative way to produce the I and Q outputs that is immune to path mismatch due to the sharing of all the analog circuitry for both paths. The one-bit second-order modulator ADC is able to convert IF signals at fs/2 and 3fs/2 (fs = 50 MHz), achieving an ENOB = 10 bits within a 1 MHz signal bandwidth. Therefore the modulator may be feasible for the typical IF frequencies used in cellular base stations. Furthermore, it provides an image rejection grater than 70 dB. The 0.35 μm BiCMOS chip consumes 28 mW at 3.3 V supply voltage.
Starting Page	233
Ending Page	243
Page Count	11
File Format	PDF
ISSN	09251030
Journal	Analog Integrated Circuits and Signal Processing
Volume Number	68
Issue Number	2
e-ISSN	15731979
Language	English
Publisher	Springer US
Publisher Date	2011-02-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analog-to-digital conversion Sigma–delta modulation Quadrature modulator Transmission-line (TL) resonators Circuits and Systems Electrical Engineering Signal, Image and Speech Processing
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Signal Processing Hardware and Architecture

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