Direct-Digital Modulation (DIDIMO) Transmitter with -156dBc/Hz Rx-Band Noise using FIR structure

Shuichi Fukuda, Shinji Miya, Miho Io, Koichi Hamashita, Bram Nauta

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

    13 Citations (Scopus)


    A direct-digital modulation (DIDIMO) transmitter employing 3-taps 10-bit Finite Impulse Response configuration is proposed and evaluated. FIR-DIDIMO provides simultaneous combination of D/A conversion, up-conversion, power control and also quantization noise filtering at arbitrary offset frequency from the carrier. This makes the circuit suitable for multistandard transmitters by eliminating the area-consuming analog baseband low-pass filter. Moreover it enables optimum RF noise shaping against various modes and bands requirement. The noise shape adjustment scheme is also detailed in this paper. Using a WCDMA signal, the transmitter achieves 81dB of power control range, EVM of less than 3% from -42dBm to +6.0dBm output power for band I operation with 568.32MHz sampling frequency. The RX band (190 MHz offset) noise floor achieves -156.3dBc/Hz measured with 291mW analog power consumption at +6.0dBm output. WCDMA band II and LTE 20M band1 performances are also demonstrated. The chip is designed and implemented with a low-power 0.13um 1.5V/3.3V CMOS process and the transmitter analog area measures 1.3mm2.
    Original languageUndefined
    Title of host publicationProceedings of the European Solid-State Circuit Conference, ESSCIRC 2012
    Place of PublicationPiscataway
    Number of pages4
    ISBN (Print)978-1-4673-2212-6
    Publication statusPublished - 17 Sep 2012
    Event38th European Solid-State Circuit Conference, ESSCIRC 2012 - Bordeaux, France
    Duration: 17 Sep 201221 Sep 2012
    Conference number: 38

    Publication series

    PublisherIEEE Press
    ISSN (Print)1930-8833


    Conference38th European Solid-State Circuit Conference, ESSCIRC 2012
    Abbreviated titleESSCIRC


    • EWI-23147
    • METIS-296343
    • IR-84553

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