Multiple power supplies for the driving circuit of local...

Details Multiple power supplies for the driving circuit of local... Multiple power supplies for the driving circuit of local...

2007-10-02

2007-10-02

Ho, Hoai V. (Department: 2827)

Static information storage and retrieval

Systems using particular element

Capacitors

C365S189110, C365S230060

Reexamination Certificate

active

11304416

ABSTRACT:
Methods and circuits to reduce power consumption of DRAM local word-line drivers are disclosed. A first voltage converter provides a voltage VPP1, which is lower than the voltage VPP required to operate a word-line of a DRAM cell array. A voltage detector monitors the voltage level of the local word-line driver. Once the voltage level VPP1is reached on the local word-linedriver switching means as e.g. tri-state drivers put the final VPP voltage on the word line. This VPP voltage is the output of a second voltage boost converter. Putting the voltage in two stages on the word-line reduces the overall power consumption. The voltage level VPP1has to be carefully selected to find a compromised solution between current consumption and performance.

REFERENCES:
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patent: 5557580 (1996-09-01), Numaga et al.
patent: 6236617 (2001-05-01), Hsu et al.
patent: 6747904 (2004-06-01), Chen
patent: 6774708 (2004-08-01), Matsui
patent: 7091769 (2006-08-01), Kwon et al.
patent: 2004/0207458 (2004-10-01), Origassa et al.

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