A Periodically Refreshed Capacitive Floating Level Shifter for Conditional Switching Applications

Junyoung Maeng, Minseob Shim, Junwon Jeong, Inho Park, Chulwoo Kim

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    This letter presents a periodically refreshed capacitive floating level shifter (CFLS) for applications that require a conditional switching signal. The proposed structure can generate a floating signal without additional bias voltage, and all coupling capacitors (CCs) can be simultaneously refreshed. Digital low-dropout (DLDOs) regulators are integrated to show how the leakage current from a CC affects the DLDOs that are driven by conventional and proposed CFLSs. Results are measured according to the temperature and supply voltage. With a 28-nm CMOS process, the proposed CFLS achieves a delay of 8.9 ns including the I/O buffer delay and an energy consumption of 788 fJ per cycle at VDD = 0.9 V.

    Original languageEnglish
    Article number9132691
    Pages (from-to)1264-1268
    Number of pages5
    JournalIEEE Transactions on Power Electronics
    Volume36
    Issue number2
    DOIs
    Publication statusPublished - 2021 Feb

    Bibliographical note

    Funding Information:
    Manuscript received May 15, 2020; revised June 12, 2020; accepted June 28, 2020. Date of publication July 2, 2020; date of current version September 22, 2020. This work was supported by the Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea Government (MSIT) (2019-0-01370, Development of LPDDR5 memory interface for A.I. application processor). (Corresponding author: Chulwoo Kim.) Junyoung Maeng, Inho Park, and Chulwoo Kim are with the Department of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: [email protected]; [email protected]; [email protected]).

    Publisher Copyright:
    © 1986-2012 IEEE.

    Keywords

    • Capacitively coupled level shifter (LS)
    • conditional switching signal
    • nonperiodic signal
    • periodic charge refresh

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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