High ACLR 1-bit direct radio frequency converter using symmetric waveform

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have developed a prototype of 1-bit direct radio frequency converter (DRFC) which is a kind of RF transmitter using bandpass delta-sigma modulation (BP-DSM). This prototype has functionalities to synchronously transmit two signals up to 6 Gb/s and to reduce intersymbol interference of eye pattern. In a trial, we transmitted a pair of 1 carrier with 5 MHz bandwidth of LTE at 300 MHz using BP-DSM to aim the MIMO, with an ACLR of 47 dB. This paper investigated the relationship between the ACLR of BP-DSM and analog waveform of 1-bit pulse train using the prototype. To clarify waveform influence, we introduced waveform decomposition into symmetric and asymmetric components to the time axis. We calculated numerical simulations using several types of waveforms varying the transition time. We confirmed that the asymmetric component causes spectrum leakage at adjacent channels. We finally concluded that the optimal waveform for BP-DSM is symmetrical to the time axis and that the ACLR in the prototype will improve to 60 dB by simulation.

Original languageEnglish
Title of host publicationEuropean Microwave Week 2012
Subtitle of host publication"Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012
Pages671-674
Number of pages4
Publication statusPublished - 2012 Dec 1
Event7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 - Amsterdam, Netherlands
Duration: 2012 Oct 292012 Oct 30

Publication series

NameEuropean Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012

Other

Other7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012
CountryNetherlands
CityAmsterdam
Period12/10/2912/10/30

Keywords

  • D/A converter
  • Delta-sigma modulator
  • LTE
  • behavioral modeling
  • noise-shaping

ASJC Scopus subject areas

  • Hardware and Architecture

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