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Digitally assisted equalization of third-order intermodulation products in wideband direct conversion receivers

Published online by Cambridge University Press:  22 June 2009

Edward A. Keehr  and
Ali Hajimiri
Edward A. Keehr
Affiliation:
Department of Electrical Engineering, California Institute of Technology, 1200 E. California Boulevard, M/C 136-93, Pasadena, CA 91125, USA.
Ali Hajimiri*
Affiliation:
Department of Electrical Engineering, California Institute of Technology, 1200 E. California Boulevard, M/C 136-93, Pasadena, CA 91125, USA.
*
Corresponding author: A. Hajimiri Email: hajimiri@caltech.edu
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Abstract

An effective linearization technique capable of equalizing IM3 products resulting from an arbitrary out-of-band blocking scenario in a wideband direct conversion receiver is presented. IM3 products are regenerated in the RF analog domain of a low-power mixed-signal feedforward path and are used to cancel analogous signal terms in the original receiver at digital baseband via adaptive equalization. The composite SAW-less receiver achieves an improvement in effective IIP3 from −7.1 to +5.3 dBm under worst-case UMTS Region 1 blocking when the feedforward path is active.

Keywords

RFReceiverMixed signalDigitalAdaptiveLinearization
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Special Issue 4: European Microwave Week 2008 , August 2009 , pp. 377 - 385
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2009

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