NDLI: Successive Regeneration and Adaptive Cancellation of Higher Order Intermodulation Products in RF Receivers

Content Provider	IEEE Xplore Digital Library
Author	Keehr, E.A. Hajimiri, A.
Copyright Year	1963
Abstract	In this paper, a general framework for the adaptive feedforward cancellation of higher order intermodulation distortion (IMD) products is presented. By generating only second-order and principal-odd-order IMD reference products in the RF/analog domain and reproducing higher order IMD reference products at digital baseband, the proposed reference distortion scheme minimizes the analog hardware burden on the system. Inherent in this procedure is an approximation that the profile of blocking signals causing IMD is dominated by one very large blocker. The limitations imposed by this approximation are quantitatively examined and shown to permit cancellation ratios of nearly the square of the ratio between the dominant and nondominant blocking signal RMS amplitudes. An experimental receiver employing the proposed technique was constructed utilizing a wide-swing low-noise transconductance amplifier in order to accommodate a rail-to-rail (+12.4 dBm) out-of-band blocker and a -16.3-dBm nondominant blocker. The measured receiver out-of-band 1-dB desensitization point is +12.5 dBm and the peak uncorrected two-tone third-order intermodulation intercept point (IIP3) is +33.5 dBm. Utilizing the proposed IMD cancellation scheme in the presence of a modulated dominant blocker improves the total input-referred IMD error power by over 24 dB, resulting in an extrapolated IIP3 metric of +43.5 dBm.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	1379
Ending Page	1396
Page Count	18
File Size	2618564
File Format	PDF
ISSN	00189480
Volume Number	59
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Receivers Polynomials Approximation methods Radio frequency Baseband Generators Linearity RF receivers Adaptive equalization feedforward cancellation mixed-signal linearization nonlinear circuits
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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