NDLI: A Complex Image Rejection Circuit With Sign Detection Only

Content Provider	IEEE Xplore Digital Library
Author	Lerstaveesin, S. Bang-Sup Song
Copyright Year	1966
Abstract	In direct-conversion receivers, radio frequency (RF) signals are down-converted to low or zero intermediate frequency (IF) using complex in-phase and quadrature (I/Q) mixers with no prior image filtering. Due to I/Q path gain and phase errors, image leaks into the signal band during the down-conversion process. A generic image rejection algorithm is proposed to reject image in the baseband using a zero-forcing sign-sign adaptive feedback concept. The orthonormal property of complex I/Q channels is exploited to update their gain and phase errors by detecting only four signs, and image is corrected with four multiplications and two additions. The proposed image rejection algorithm can be implemented in a digital, analog, or hybrid form. A complex baseband sample and hold (S/H) with a digital error detector, which is a hybrid example, achieves an image rejection of 65 dB while sampling at 40 MS/s. The prototype chip fabricated in 0.18-mum CMOS occupies 800times450 mum², and consumes 23 mW at 1.8 V
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	2693
Ending Page	2702
Page Count	10
File Size	1413949
File Format	PDF
ISSN	00189200
Volume Number	41
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuits Radio frequency Baseband Receivers RF signals Filtering Signal processing Feedback Error correction Phase detection zero-IF receiver Direct-conversion receiver image image rejection low-IF receiver in-phase and quadrature $I/Q$ gain and phase mismatches
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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