A 73.1dB SNDR Digitally Assisted Subsampler for RF Power Amplifier Linearization Systems
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Show full item recordAbstract
We present a digitally assisted subsampler, designed to serve as the
downconversion path in adaptive predistorters for 800MHz–5.8GHz
RF power amplifiers. We use digital averaging to overcome the
noise folding problems of subsampling, obtaining a final SNDR of
73.1dB for signals centered about a 2.4GHz carrier. Using quadrature
subsampling, we obtain both the I and Q samples from the same
physical path and thereby eliminate IQ gain mismatch. When used
as part of an adaptive predistortion system, the subsampler enables
an EVM improvement of 3.2% and distortion products suppression
of up to 7.6dB for 802.11g signals. The subsampler IC, designed
in a 90nm CMOS process, consumes 6.0mW from a 1.2V supply.
Description
conference website
Date issued
2009-04Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Microsystems Technology LaboratoriesJournal
16th International Symposium on VLSI Technology, Systems and Applications (2009 VLSI-TSA)
Publisher
VLSI-TSA
Citation
Chung, SungWon and Joel L. Dawson. "A 73.1dB SNDR Digitally Assisted Subsampler for RF Power Amplifier Linearization Systems." 6th International Symposium on VLSI Technology, Systems and Applications (2009 VLSI-TSA), 27-29, April 2009, Hsinchu, Taiwan. © 2009 VLSI-TSA.
Version: Final published version