A High-Speed DSP Engine for First-Order Hold Digital Phase Modulation in 28-nm CMOS

Enrico Roverato, Marko Kosunen, Jerry Lemberg, Mikko Martelius, Kari Stadius, Lauri Anttila, Mikko Valkama, Jussi Ryynanen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
152 Downloads (Pure)

Abstract

Conventional delay-based digital phase modulators use a zero-order hold (ZOH) phase control word to modulate the square-wave RF carrier. Recently, new architectures capable of performing first-order hold (FOH) digital phase modulation have been proposed, thus improving the wideband performance to a level suitable for 5G base stations. While currently available literature focuses on the generic operation principle, this brief details the first on-chip implementation of the DSP engine required for actual FOH computations. The circuit is based on a simple iterative algorithm, which can be pipelined for high-speed operation. The DSP engine has been integrated as part of a prototype 5G base-station outphasing transmitter, fabricated in 28-nm CMOS. When processing a 100-MHz orthogonal frequency-division multiplexing signal, the DSP achieves an adjacent-channel leakage ratio of –53 dBc, which is 12 dB better than with conventional ZOH phase modulation. Furthermore, the system enables flexible upconversion to any frequency between 0.35 and 2.1 GHz from a fixed 1.5-GHz reference clock. The power consumption of a single engine is lower than 18 mW.

Original languageEnglish
Pages (from-to)1959 - 1963
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume65
Issue number12
Early online date22 Mar 2018
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Computer architecture
  • Digital phase modulator
  • DSP
  • Engines
  • first-order hold (FOH)
  • Interpolation
  • phase interpolation.
  • Phase modulation
  • Radio frequency
  • Transmitters
  • Wideband

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  • Projects

    ADVANTAG5: Advanced Wide-Band Transceiver Architectures for Beyond 5G Wireless Systems

    Kosunen, M.

    01/05/201731/12/2020

    Project: EU: Framework programmes funding

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