Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Patent
1996-12-04
1997-09-23
Westin, Edward P.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
326 17, 326 34, 326 86, 327170, H03K 190948, H03K 19017, H03K 1716
Patent
active
056708947
ABSTRACT:
The present invention is to provide an output circuit, for a semiconductor circuit, capable of increasing the rise or fall time of an output signal without reducing the operating frequency of the output circuit, and thus effectively preventing occurrence of a malfunction due to an undesired change in the output signal caused by ringing, noise, or reflection occurring at the transition of the output signal. In the structure of present invention, an output circuit for a semiconductor circuit includes an input circuit, an output circuit including a transistor, and a control signal control circuit that lies between the input circuit and output circuit, outputs a control signal for use in driving the transistor in the output circuit, and changes the control signal according to a function of time.
REFERENCES:
patent: 4739193 (1988-04-01), Doty, II
patent: 4779013 (1988-10-01), Tanaka
patent: 4785203 (1988-11-01), Nakamura
patent: 4894560 (1990-01-01), Chung
patent: 5070256 (1991-12-01), Grondalski
patent: 5497113 (1996-03-01), Uber
Takaishi Toru
Tanizawa Tetsu
Fujitsu Limited
Santamauro Jon
Westin Edward P.
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