A bitline leakage compensation scheme for low-voltage SRAMs

Ken'ichi Agawa, Hiroyuki Hara, Toshinari Takayanagi, Tadahiro Kuroda

    Research output: Contribution to journalArticle

    54 Citations (Scopus)

    Abstract

    A bitline leakage current of an SRAM, induced by leakage current of the transmission transistors in the cells that are associated with the bitline, increases as the threshold voltage (VTH) of the transistors is reduced for high performance at low power-supply voltage (VDD). The increased bitline leakage causes slow or incorrect read/write operation of an SRAM because the leakage current acts as noise current for a sense amplifier. In this paper, the problem has been solved from a circuitry point of view, and the scheme which detects the bitline leakage current in a precharge cycle and compensates for it during a read/write cycle is proposed. Employing this scheme, the SRAM with 360-μA bitline leakage current can perform a read/write operation at the same speed as one that has no bitline leakage current. This enables a 0.1-V reduction in VTH, and keeps the VTH and delay scalability of a high-performance SRAM in technology progress. An experimental 8-kb SRAM with 256 rows in fabricated in a 0.25-μm CMOS technology, which demonstrates the effectiveness of the scheme.

    Original languageEnglish
    Pages (from-to)726-734
    Number of pages9
    JournalIEEE Journal of Solid-State Circuits
    Volume36
    Issue number5
    DOIs
    Publication statusPublished - 2001 May 1

    Keywords

    • Bitline leakage currents
    • CMOS analog integrated circuits
    • Compensation scheme
    • Leak detection
    • Low-voltage operation
    • SRAM chips

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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