A 0.025-0.45 W 60%-efficiency inductive-coupling power transceiver with 5-bit dual-frequency feedforward control for non-contact memory cards

Hayun Chung, Andrzej Radecki, Noriyuki Miura, Hiroki Ishikuro, Tadahiro Kuroda

    Research output: Contribution to journalArticle

    10 Citations (Scopus)


    A 0.025-0.45 W inductive-coupling power transceiver for non-contact memory applications is presented. To deal with sudden and large load variations and achieve high-efficiency, we propose a power transceiver with 5-bit feedforward control. Knowing that load patterns of a memory card have strong correlation with commands issued by a host, feedforward control is applied to minimize response times. To achieve 5-bit power levels, the proposed transceiver utilizes pulse-density modulation (PDM) and a multi-channel structure. Different operation frequencies are chosen for each channel to maximize power transfer efficiency. To further improve transceiver efficiency and enable high-speed operation, an active rectifier with a fast positive feedback is proposed. The test prototype demonstrates 40%-70% efficiency across all load conditions and 60% efficiency in average, which are over an order of magnitude improvements compared to prior arts.

    Original languageEnglish
    Article number6293915
    Pages (from-to)2496-2504
    Number of pages9
    JournalIEEE Journal of Solid-State Circuits
    Issue number10
    Publication statusPublished - 2012 Sep 7



    • Active rectifier
    • dual-frequency
    • feedforward
    • high efficiency
    • inductive-coupling
    • power transceiver
    • wide load range

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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