Output buffer circuits including logic gates having balanced...

Details Output buffer circuits including logic gates having balanced... Output buffer circuits including logic gates having balanced...

2006-04-18

2006-04-18

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S026000, C326S057000, C326S083000

Reexamination Certificate

active

07030643

ABSTRACT:
A buffer circuit may include an output terminal, a pull-up transistor, a pull-down transistor, and first and second logic gates. The pull-up transistor is connected between the output terminal and a supply voltage, and the pull-up transistor pulls the output terminal up to the supply voltage responsive to a pull-up control signal. The pull-down transistor is connected between the output terminal and a reference voltage, and the pull-down transistor pulls the output terminal down to the reference voltage responsive to a pull-down control signal. The first logic gate may generate the pull-up control signal at a first output node responsive to a control signal and a data signal, and the first logic gate may include a plurality of serially connected transistors in an electrical path between the supply voltage and the first output node. The second logic gate may generate the pull-down control signal at a second output node responsive to the data signal and an inverse of the control signal, and the second logic gate may include a plurality of serially connected transistors in a path between the supply voltage and the second output node.

REFERENCES:
patent: 6229336 (2001-05-01), Felton et al.
patent: 6255867 (2001-07-01), Chen
patent: 6329840 (2001-12-01), Moyal
patent: 11202970 (1999-07-01), None
Rhyne, 1973, Fundamentals of Digital Systems Design, N.J., pp. 70-71.
Korean Office Action for Application No. 10-2002-0067745.
English Translation of Korean Office Action for Application No. 10-2002-0067745.
Logic Gates-Digital Logic Circuits “Truth Table for the “NOR” Gate”; http://www.autoshop101.com/trainmodules/logicgate/127.html, no date.
Logic Gates-Digital Logic Circuits “Truth Table for the “NAND” Gate”; http://www.autoshop101.com/trainmodules/logicgat/121.html, no date.

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