Logic circuit for selective performance of logical functions

Details Logic circuit for selective performance of logical functions Logic circuit for selective performance of logical functions

1986-12-16

1988-07-12

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307355, 307357, 3072721, 307289, H03K 19086, H03K 19092, H03K 1762, H03K 302

Patent

active

047572167

ABSTRACT:
A logic circuit capable of selection of logical functions has an input terminal supplied with a binary signal; a first transistor with a base electrode connected to the input terminal, a collector supplied with a first voltage, and an emitter producing a first output signal; a first resistor whose one end is connected to the emitter of the first transistor and the other is supplied with a second voltage; a second transistor having a base electrode supplied with a reference voltage whose level lies between levels of the first and second voltages, an emitter connected to the emitter of the first transistor, and a collector for providing a second output signal; a second resistor whose one end is connected to the collector electrode of the second transistor and the other supplied with the first voltage. A first circuit has a first threshold value so set that the first output signal is judged to be a predetermined logical value in response to the first binary signal and to be a logical value corresponding to a logical value of the second binary signal in response to the second binary signal. A second circuit has a different threshold value so set that the second output signal is judged to be a predetermined logical value in response to the second binary signal and to be a logical value corresponding to a logical value of the first binary signal in response to the first binary signal.

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patent: 4675553 (1987-06-01), Price et al.

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