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Balanced line driver for local area networks or the like

  • US 5,285,477 A
  • Filed: 12/18/1991
  • Issued: 02/08/1994
  • Est. Priority Date: 12/18/1991
  • Status: Expired due to Term
First Claim
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1. A differential line driver having two outputs, CHARACTERIZED BY:

  • a first pair of serially coupled switches having first, second and common outputs and two inputs controlling corresponding switches, the common output coupling to a first one of the two driver outputs;

    a second pair of serially coupled switches having a first, second and common outputs and two inputs for controlling corresponding switches, the common output coupling to a second one of the two driver outputs;

    a first resistor with two terminals, one terminal coupling to a first power source and the other terminal coupling to the first outputs of each of the pairs of switches;

    a second resistor with two terminals, one terminal coupling to a second power source and the other terminal coupling to the second outputs of each of the pairs of switches; and

    ,control means having a data input and an enable input and coupling to the inputs of the switches, for switching the switches in response to the data input when the enable is active and closing all switches when enable signal is inactive.

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