MESFET logic device with clamped output drive capacity and low p

Details MESFET logic device with clamped output drive capacity and low p MESFET logic device with clamped output drive capacity and low p

1996-02-22

1998-03-10

Westin, Edward P.

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326 30, H03K 190952

Patent

active

057265917

ABSTRACT:
A logic gate circuit includes a logic gate stage to which an input signal is supplied, for outputting a signal depending on a state of the input signal, an output driver stage having an enhancement-type transistor for pull-up and a pull-down circuit, the enhancement-type transistor having a drain connected to a power supply line, a gate to which the signal output from the logic gate stage is supplied and a source connected to the pull-down circuit, the pull-down circuit being connected to the ground line and controlled by the input signal, and a clamping circuit for clamping a gate voltage of the enhancement-type transistor of the output driver stage at a constant voltage so that a node at which the source of the enhancement-type transistor and the pull-down circuit are connected has a high level, the node being an output terminal of the logic gate circuit. A logic gate circuit may have at least an output driver stage including an enhancement-type transistor for pull-up and an enhancement-type transistor for pull-down, and a clamping circuit for clamping the gate voltage of the enhancement-type transistor for the pull-up.

REFERENCES:
patent: 4716311 (1987-12-01), Davenport et al.
patent: 4810969 (1989-03-01), Fulkerson
patent: 4935647 (1990-06-01), Larkins
patent: 5021686 (1991-06-01), Kawata et al.
patent: 5107144 (1992-04-01), Hirayama
patent: 5182473 (1993-01-01), Wikstrom
patent: 5343091 (1994-08-01), Terada
Patent Abstracts of Japan--vol. 14, No. 411 (E-0973) Sep. 5, 1990 & JP-A-02 155 309 (Oki Electric Co Ltd.) Jun. 14, 1990. Abstract.
Patent Abstracts of Japan--vol. 14, No. 502 (E-0997) Nov. 2, 1990 & JP-A-02 209 011 (Agency of Ind Science and Technol.) Aug. 20, 1990. Abstract.
Patent Abstracts of Japan--vol. 14, No. 142 (E-904) Mar. 16, 1990 & JP-A-02 005 618 (Fujitsu Ltd.) Jun. 23, 1988. Abstract.

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