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Digitally Enhanced Wideband I/Q Downconversion Receiver With 2-Channel Time-Interleaved ADCs

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Details

Original languageEnglish
Pages (from-to)29-33
Number of pages5
JournalIEEE Transactions on Circuits and Systems, Part 2: Express Briefs
Volume63
Issue number1
Early online date22 Dec 2015
DOIs
Publication statusPublished - 2016
Publication typeA1 Journal article-refereed

Abstract

The interesting concept of employing in-phase/quadrature (I/Q) downconversion together with time-interleaved analog-to-digital converters allows digitizing very wide instantaneous radio-frequency (RF) bandwidths (BWs) and grants enhanced flexibility in accessing and processing the RF spectrum. Such a structure also inevitably suffers from performance degradation due to the analog components' nonidealities, e.g., frequency response mismatches (FRMs), that ultimately lead to spurious mismatch components that limit the system's dynamic range. Available solutions developed for I/Q mismatches or time-interleaving mismatches alone are not compatible for correcting the FRM spurs in such joint I/Q time-interleaved converter (IQ-TIC) architecture. This brief proposes novel blind FRM identification and correction solutions that are able to suppress all the associated spurs in the considered wideband IQ-TIC architecture. The proposed digital correction solutions are tested and verified using measured hardware data obtained from an experimental platform, exhibiting good FRM spur correction performance with instantaneous BW on the order of 800 MHz. These developments pave the way toward 5G radio communication devices and systems where instantaneous BWs on the order of 1 GHz are envisioned at centimeter- and millimeter-wave frequency bands.

Keywords

  • Distortion, Frequency response, Mirrors, Radio frequency, Receivers, Wideband, 5G radio communication, Digitally assisted analog/radio frequency (RF), Frequency response mismatches, I/Q mismatches, digitally assisted analog/RF, frequency response mismatches (FRMs), in-phase/quadrature (I/Q) mismatches, time-interleaved ADCs, time-interleaved analog-to-digital converters (TI-ADCs), wideband (WB) analog I/Q downconversion, wideband analog I/Q downconversion

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