Design and Implementation of a Wideband Digital Interpolating Phase Modulator RF Front-End

Jerry Lemberg, Marko Kosunen, Tero Nieminen, Enrico Roverato, Mikko Martelius, Kari Stadius, Jussi Ryynänen, Lauri Anttila, Mikko Valkama

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    2 Citations (Scopus)
    33 Downloads (Pure)


    This paper describes implementation details of a digital-intensive phase modulator architecture that does not require a frequency synthesizer to cover a wide carrier frequency range. The phase modulator operation is based on toggling the output accurately during the sample period to generate the phase-modulated signal. The toggling instants within the sample period are calculated by DSP solvers that utilize linear interpolation. The interpolation effectively multiplies the phase signal sample rate by the modulator phase resolution, which enables wider signal bandwidth and a completely digital method of defining the transmitter carrier frequency. The phase modulator concept is verified by implementing it as a part of an outphasing transmitter in 28 nm CMOS. With a constant sample rate of 1.5 GHz and without any predistortion, the transmitter achieves better than -28 dBc ACLR with 100 MHz aggregated LTE downlink signal between 0.8-2.0 GHz carrier frequency.

    Original languageEnglish
    Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
    ISBN (Electronic)9781538648810
    Publication statusPublished - 26 Apr 2018
    Publication typeA4 Article in conference proceedings
    EventIEEE International Symposium on Circuits and Systems - Florence, Italy
    Duration: 27 May 201830 May 2018

    Publication series

    ISSN (Electronic)2379-447X


    ConferenceIEEE International Symposium on Circuits and Systems

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering


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