Emitter coupled logic circuit having independent input transisto

Details Emitter coupled logic circuit having independent input transisto Emitter coupled logic circuit having independent input transisto

1990-08-22

1992-06-02

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307456, 307242, 307246, 307270, H03K 19092, H03K 1716

Patent

active

051189739

ABSTRACT:
An improved emitter coupled logic circuit suitable for high speed logic operation independent of capacitive load. With previous circuits as the load to be driven become heavier, the capacitive load required a longer time for discharge and the output signal was dulled, resulting in adverse effect on the logic operation when the output changed to a low level from a high level. A pulse has also been previously applied to a pull-down transistor connected between the output and a power source through a capacitor from an inverted phase output to actively discharge the capacitive load. However, when the capacitor is connected to the output it hinders the switching speed of a current switch. In the present invention, a transistor is provided an input circuit and a pulse is applied to a pull-down transistor from the transistor. As a result, an extra capacitive element is not connected to the output end, but a pulse is applied to the pull-down transistor. Accordingly, even if the capacitive load becomes heavier, the speed of the circuit is not harmed.

REFERENCES:
patent: 4680480 (1987-07-01), Hopta
patent: 4906869 (1990-03-01), Masuoka
Patent Abstracts of Japan, vol. 13, No. 343 (E-796) [3691], Aug. 2, 1989 & JP-A-1 101 022 (Hitachi Ltd.) Apr. 19, 1989.
Patent Abstracts of Japan, vol. 8, No. 221 (E-271) [1658], Oct. 9, 1984; & JP-A-59 105 719 (Fujitsu K.K.).
Patent Abstracts of Japan, vol.14, No. 348 (E-957) [4291], Jul. 27, 1990; & JP-A-2 121 409 (Hitachi Ltd.) May 9, 1990.
Soviet Inventions Illustrated, Section U21, Week 8928, Aug. 23, 1989, Class U21-CIA, Accession No. 89-205294/28, Derwent Publications Ltd., London, GB; & SU-1-141 850 (TAWI).

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