A Prototype SAW-Less LTE Transmitter with a High-Linearity Modulator Using BPF-Based I/Q Summing and a Triple-Layer Marchand Balun

Takahiro Nakamura, Naoki Kitazawa, Kaoru Kohira, Hiroki Ishikuro

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    A 65-nm CMOS-technology-based surface-acoustic-wave filterless transmitter (TX) for a long-term evolution (LTE) system was developed and performance tested. The TX incorporates both a passive quadrature modulator (QMOD) using bandpass filter (BPF)-based in-phase/quadrature (I/Q) signal summing and a small triple-layer Marchand balun. The passive operation and BPF-based I/Q summing, respectively, contribute to low noise performance and high input impedance (seen from the baseband signal), resulting in low receiver (RX) band noise and high linearity of the TX. The triple-layer Marchand balun contributes to the small area of the TX. A prototype LTE TX using the QMOD and the balun exhibits in-specification RX-band noise (2).

    Original languageEnglish
    Article number7303973
    Pages (from-to)4090-4097
    Number of pages8
    JournalIEEE Transactions on Microwave Theory and Techniques
    Volume63
    Issue number12
    DOIs
    Publication statusPublished - 2015 Dec 1

    Keywords

    • Bandpass filter (BPF)-based in-phase/quadrature (I/Q) summing
    • long-term evolution (LTE)
    • surface acoustic wave (SAW)-less
    • triple-layer Marchand balun

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Radiation

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