Exclusive-or logic gate with four two-by-two complementary input

Details Exclusive-or logic gate with four two-by-two complementary input Exclusive-or logic gate with four two-by-two complementary input

1998-09-23

2000-10-24

Tokar, Michael

Electronic digital logic circuitry

Exclusive function

With field-effect transistor

331 53, H03K 1921

Patent

active

061373095

ABSTRACT:
An Exclusive-OR logic gate with four two-by-two complementary inputs and two complementary outputs. The structure of this Exclusive-Or gate is said to be symmetrical in that the gate has a propagation time that is identical whichever of the two pairs of complementary inputs is switched over, whatever the nature of the transition at output and whatever the logic state of the pair of inputs that do not switch over. The disclosed device enables a further reduction in the differences in the time taken for the propagation of the signal edges through the gate by eliminating the floating character of certain nodes. It also relates to a frequency multiplier comprising a tree of Exclusive-Or gates such as this.

REFERENCES:
patent: 5479112 (1995-12-01), Choi et al.
European Patent Abstract of Japanese Publication No. 57065927, published Apr. 21, 1982.
European Patent Abstract of Japanese Publication No. 61294934, published Dec. 25, 1986.
European Patent Abstract of Japanese Publication No. 05152936, published Jun. 18, 1993.
IBM Technical Disclosure Bulletin, vol. 30, No. 9, Feb. 1988, Armonk, New York, USA, pp. 17-19.
European Search Report dated May 18, 1998 with annex on French Application No. 97 11956.

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