A 250 mV Bit-Line Swing Scheme for 1-V Operating Gigabit Scale DRAMs

Tsuneo INABA
Daisaburo TAKASHIMA
Yukihito OOWAKI
Tohru OZAKI
Shigeyoshi WATANABE
Takashi OHSAWA
Kazunori OHUCHI
Hiroyuki TANGO

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C    No.12    pp.1699-1706
Publication Date: 1996/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Low-Power LSI Technologies)
Category: 
Keyword: 
DRAM,  power dissipation,  reliability,  bit-line,  wordline,  small swing,  threshold voltage,  sense amplifier,  memory cell,  

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Summary: 
This paper proposes a small 1/4Vcc bit-line swing scheme and a related sense amplifier scheme for low power 1 V operating DRAM. Using the proposed small bit-line swing scheme, the stress bias of memory cell transistor and capacitor is reduced to half that of the conventional DRAM, resulting in improvement of device reliability. The proposed sense amplifier scheme achieves high speed and stable sensing/restoring operation at 250mV bit-line swing, which is much smaller than threshold voltage. The proposed scheme reduces the total power dissipation of bit-line sensing/restoring operation to 40% of the conventional one. This paper also proposes a small 4F2 size memory cell and a new twisted bit-line scheme. The array noise is reduced to 8.6% of the conventional DRAM.