Static information storage and retrieval – Systems using particular element – Capacitors
Reexamination Certificate
2005-10-11
2005-10-11
Phan, Trong (Department: 2827)
Static information storage and retrieval
Systems using particular element
Capacitors
C365S203000, C365S210130
Reexamination Certificate
active
06954371
ABSTRACT:
The present invention provides a dynamic RAM which can be operated at a low voltage and realizes the enhancement of a read margin and an area-saving layout. In a memory array including a plurality of memory cells having capacitors which are formed corresponding to a plurality of word lines and a plurality of bit lines, stored information of the memory cell which is read to one bit line out of the pair of bit lines is sensed by a sense amplifier in response to a reference voltage which is formed by a dummy cell connected to another bit line, a precharge voltage of high level or low level corresponding to an operational voltage by a precharge circuit is supplied to the bit lines, and the dummy cells having the same structure as the memory cells are formed at crossing points of word lines for dummy cells and bit lines arranged outside the memory array, MOSFETs which precharge an intermediate voltage between the high level voltage and the low level voltage to the capacitors are provided, and gates of the MOSFETs are connected with charge word lines for dummy cells which are extended in parallel with the word lines for dummy cells.
REFERENCES:
patent: 6052324 (2000-04-01), Tobita
patent: 6111802 (2000-08-01), Kano et al.
patent: 6594187 (2003-07-01), Ito
patent: 6687152 (2004-02-01), Ohsawa
patent: 6687177 (2004-02-01), Kurjanowicz
patent: 11-39872 (1999-02-01), None
Hasegawa Masatoshi
Hokari Tomofumi
Tanaka Yousuke
Miles & Stockbridge PC
Phan Trong
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