Logic circuit for use in D/A converter having ECL-type gate stru

Details Logic circuit for use in D/A converter having ECL-type gate stru Logic circuit for use in D/A converter having ECL-type gate stru

1990-02-07

1991-07-23

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307445, 307463, H03K 19086

Patent

active

050346300

ABSTRACT:
A logic circuit outputs state signals of seven different kinds, on the basis of first, second and third digital signals. A first composite gate circuit outputs a logical OR among the first to third digital signals as a first state signal. A first gate circuit outputs a logical OR between the second and third digital signals as a second state signal. A second composite gate circuit is supplied with a logical AND between the first and second digital signals, and outputs a logical OR between the supplied logical AND and the third digital signal as third state signal. A third composite gate circuit is supplied with a logical OR between the first and second digital signals, and outputs a logical AND between the supplied logical OR and the third digital signal as a fifth state signal. A second gate circuit outputs a logical AND between the second and third digital signals as a sixth state signal. A fourth composite gate circuit is supplied with a logical AND between the first and second digital signals, and outputs a logical AND between the supplied logical AND and the third digital signal as a seventh state signal. The third digital signal is output as a fourth state signal without being processed. Each of the above circuits has an emitter coupled logic structure.

REFERENCES:
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patent: 4695826 (1987-09-01), Ando et al.
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patent: 4833473 (1989-05-23), Dingwall
patent: 4837573 (1989-06-01), Brooks
patent: 4872011 (1989-10-01), Pelgrom et al.
patent: 4910514 (1990-03-01), Zrmer et al.

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