Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Reexamination Certificate
2006-04-18
2006-04-18
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
C326S026000, C326S027000, C326S037000, C326S038000, C327S374000
Reexamination Certificate
active
07030659
ABSTRACT:
An electronic switch applies ground potential to the backgate of a MOS pass transistor when the transistor is in the off state and the switch is open, during normal conditions. When the transistor is switched to the on state and the switch is closed, the gate voltage is applied to the backgate of the pass transistor in order to reduce the threshold voltage and the on resistance. During an undershoot condition, the gate of the pass transistor is connected to the negative voltage applied to an input port and this voltage is also connected to the backgate of the pass transistor to prevent the pass transistor from being biased on or the parasitic NPN transistor from being biased on and transmitting the input glitch to the output.
REFERENCES:
patent: 5963080 (1999-10-01), Miske et al.
patent: 6100719 (2000-08-01), Graves et al.
patent: 6236259 (2001-05-01), Goodell et al.
patent: 6320408 (2001-11-01), Kwong
U.S. Appl. No. 10/453,249 filed Jun. 2, 2003 (TI-34946).
Barnie Rexford
Brady III W. James
Crawford Jason
Kempler William B.
Telecky , Jr. Frederick J.
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