Sense amplifier circuit of semiconductor memory device and...

Details Sense amplifier circuit of semiconductor memory device and... Sense amplifier circuit of semiconductor memory device and...

2007-07-30

2009-08-04

Auduong, Gene N. (Department: 2827)

Static information storage and retrieval

Read/write circuit

Flip-flop used for sensing

C365S189110, C365S210130

Reexamination Certificate

active

07570529

ABSTRACT:
A sense amplifier circuit of a semiconductor memory device and a method of operating the same, in which the sense amplifier circuit includes a bit line sense amplifier connected with a bit line to sense and amplify a signal of the bit line, and a calibration circuit calibrating a voltage level of the bit line based on a logic threshold value of the bit line sense amplifier. The bit line sense amplifier senses and amplifies the signal of the bit line after the voltage level of the bit line is calibrated. The bit line sense amplifier may include a 2-stage cascade latch, which includes a first inverter having an input terminal connected with the bit line; and a second inverter which has an input terminal connected with an output terminal of the first inverter and an output terminal connected with the bit line and is enabled/disabled in response to a sensing control signal. The calibration circuit includes a switch element that is connected between the output terminal of the first inverter and the bit line and is turned on or off in response to a calibration control signal.

REFERENCES:
patent: 6275961 (2001-08-01), Roohparvar
patent: 6704218 (2004-03-01), Rickes et al.
patent: 6804141 (2004-10-01), Rickes et al.
patent: 05-054652 (1993-03-01), None
patent: 100206408 (1999-04-01), None
patent: 1020000073689 (2000-12-01), None
patent: 1020050102952 (2005-10-01), None
Korean Office Action in corresponding application No. KR 10-2006-0133208 dated Feb. 27, 2008.

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