Circuit for converting a logical signal into two balanced logica

Details Circuit for converting a logical signal into two balanced logica Circuit for converting a logical signal into two balanced logica

1982-12-27

1985-06-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, 375 36, H04J 1104, H04J 302, H04B 300

Patent

active

045258368

ABSTRACT:
A circuit receives an input logical signal of one polarity and converts it into two balanced logical output signals of the opposite polarity. The circuit comprises two resistors connected between a reference potential source of the polarity of the output signals and the terminals at which the output signals are provided. The circuit also comprises a current source. Each resistor has a resistance value such that when it is traversed by the current from the current source the potential difference between its ends is equal to the difference between the two possible potential levels of the output signals. A differential switching device responds to the input signal being at a first potential level by connecting one of the output terminals to the current source and isolating the other output terminal from the current source, and vice versa when the input signal is at a second potential level.

REFERENCES:
patent: 2936337 (1960-05-01), Lewis
patent: 3573635 (1971-04-01), DaCosta
patent: 4037049 (1977-07-01), Lyon

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