Noninverting current-mode logic gate

Details Noninverting current-mode logic gate Noninverting current-mode logic gate

H - Electricity

03

K

328/136

H03K 19/21 (2006.01) H03K 19/086 (2006.01) H03K 19/20 (2006.01)

Patent

CA 1056920

NONINVERTING CURRENT MODE LOGIC GATE Abstract of the Disclosure A high speed bipolar noninverting current-mode logic AND gate is the basic building block for a current- mode logic family. The AND gate comprises a current steering differential pair of transistors, a pair of dual emitter input transistors, a dual emitter reference transistor, an output resistor and a fixed current source. The conducting state of the current steering transistor pair is so controlled that a logic "one" at the base electrodes of both input transistors produces a logic "one" at an output terminal taken from the collector electrode of the reference transistor. Further, a logic "zero" at both input transistors produces a logic "zero" at the output terminal and finally the condition of a "zero" at one input and a "one" at the other input produces a "zero" at the output. This result is attained as a consequence of control of the conduction state of the current steering pair so as to provide the same current level through the reference transistor for the "zero-one" input as for the "zero-zero" input, thus producing the noninverting AND function.

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