Latch-type sense amplifier

Details Latch-type sense amplifier Latch-type sense amplifier

2007-06-05

2007-06-05

Le, Thong Q. (Department: 2827)

Static information storage and retrieval

Read/write circuit

Flip-flop used for sensing

C365S207000, C365S194000

Reexamination Certificate

active

10679941

ABSTRACT:
An improved latch-type sense amplifier circuit having two cross-coupled inverters forming a latch, a supply coupling device for selectively connecting the latch to a supply source, and a bit line coupling circuits for selectively connecting the inputs of each inverter to the complimentary bit line from the memory array. The circuit is configured to sense a voltage difference between the bit lines with improved reliability by providing a delayed sense amplifier enable signal to pass transistors for delaying disconnection of the bit lines from the sense amplifier until the latching action is completed, and adding two transistors in series with the existing transistors of the conventional latch for correcting the offset between the threshold voltages of the inverters of the latch.

REFERENCES:
patent: 4910713 (1990-03-01), Madden et al.
patent: 5506524 (1996-04-01), Lin
patent: 5619466 (1997-04-01), McClure
patent: 5883846 (1999-03-01), Lee
patent: 5936905 (1999-08-01), Proebsting
patent: 6181621 (2001-01-01), Lovett
patent: 6301180 (2001-10-01), Sudo et al.
patent: 6351155 (2002-02-01), Pogrebnoy
patent: 6411557 (2002-06-01), Terzioglu et al.
patent: 6747485 (2004-06-01), Suryanarayana et al.

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