NDLI: ΣΔ modulators for low-power digitally intensive radio transmitters

Content Provider	IEEE Xplore Digital Library
Author	Nanda, R. Markovic, D.
Copyright Year	2012
Description	Author affiliation: Electrical Engineering Department, University of California, Los Angeles, USA (Nanda, R.; Markovic, D.)
Abstract	Digitally enhanced wireless transmitters are gaining prominence due to their promise of greater integration, flexibility to adapt to varying SNR conditions, and performance and area benefit that comes with CMOS feature size reduction. One of the drawbacks of digitally assisted linear RF modulators has been the high power consumption in the digital core. This results from the use of high sample rates in the ΣΔ modulators and RFDACs at the end of the transmitter (Tx) chain. The alternative to ΣΔ modulation is to use high resolution, high-speed RFDAC in the Tx chain. In this work we discuss a new approach that increases the order of ΣΔ modulation and reduces the sample rate without compromising the overall system integration or stability. The proposed approach leads to significant reduction in the number of quantization levels as well as the sample rate of operation. Based on power simulation results, it is shown that this approach results in significant power savings of up to 1.7x when compared to state-of-the-art linear modulators that use ΣΔ modulation.
Starting Page	109
Ending Page	113
File Size	567997
Page Count	5
File Format	PDF
ISBN	9781467350501
ISSN	10586393
e-ISBN	9781467350518
DOI	10.1109/ACSSC.2012.6488969
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-11-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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