Energy-saving circuit and method using charge equalization...

Details Energy-saving circuit and method using charge equalization... Energy-saving circuit and method using charge equalization...

2007-10-25

2009-06-09

Tran, Anh Q (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S090000, C326S113000

Reexamination Certificate

active

07545176

ABSTRACT:
An energy-saving circuit and method using charge equalization across complementary nodes reduces power consumption in memory circuits and other circuits such as wide multiplexers having complementary high-capacitance nodes. A change detection circuit detects a state change to be applied to the bitlines, and generates a pulse if a state change is to be applied. A pass gate connected between the nodes is activated in response to the pulse to equalize the charge on the bitlines. The driver circuit enable inputs are also delayed, so that the bitlines are not driven until after the charge has been equalized and the pass gate disabled. In one embodiment, the driver circuits are only enabled momentarily by a pulsed output of the change detector and keeper circuits are employed to retain the bitlines in their asserted states.

REFERENCES:
patent: 5568515 (1996-10-01), Wincn
patent: 5781469 (1998-07-01), Pathak et al.
patent: 5973972 (1999-10-01), Kwon et al.
patent: 6587385 (2003-07-01), Ooishi

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