Variable threshold-voltage CMOS technology

Tadahiro Kuroda, Tetsuya Fujita, Fumitoshi Hatcri, Takayasu Sakurai

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    This paper describes a Variable Threshold-voltage CMOS technology (VTCMOS) which controls the threshold voltage (VTH) by means of substrate bias control. Circuit techniques to combine a switch circuit for an active mode and a pump circuit for a standby mode are presented. Design considerations, such as latch-up immunity and upper limit of reverse substrate bias, are discussed. Experimental results obtained from chips fabricated in a 0.3 μm VTCMOS technology are reported. VTH controllability including temperature dependence and influence on short channel effect, power penalty caused by the control circuit, substrate current dependence at low VTH, and substrate noise influence on circuit performance are investigated. A scaling theory is also presented for use in the discussion of future possibilities and problems involved in this technology.

    Original languageEnglish
    Pages (from-to)1705-1714
    Number of pages10
    JournalIEICE Transactions on Electronics
    Issue number11
    Publication statusPublished - 2000 Jan 1


    • Low power CMOS design
    • Low voltage
    • Substrate bias
    • Threshold voltage

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering


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