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Transceiver for transmitting and receiving stair-stepped sinusoidal waveforms

  • US 5,408,497 A
  • Filed: 07/14/1993
  • Issued: 04/18/1995
  • Est. Priority Date: 07/14/1993
  • Status: Expired due to Term
First Claim
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1. A transceiver for transmitting and receiving digital signals between a plurality of nodes in a network interconnected by twisted pair lines, the transceiver comprising:

  • a converting means for converting the digital signals to be transmitted to stair-stepped sinusoidal waveforms representative of the digital signals, said converting means comprising;

    a plurality of current sources for supplying different amounts of current;

    a plurality of switching means for routing the currents supplied by the current sources to the twisted pair lines;

    a means for terminating the twisted pair lines, wherein a voltage across the twisted pair lines is proportional to the different amounts of current conducted through the twisted pair lines; and

    ,a means for controlling the plurality of switching means, wherein the voltage across the twisted pair lines appoximates the stair-stepped sinusoidal waveform;

    a means for transmitting the stair-stepped sinusoidal waveforms on the twisted hair lines;

    a means for receiving stair-stepped sinusoidal waveforms from the twisted pair lines;

    a means for processing received stair-stepped sinusoidal waveforms to square waves representing digital signals;

    a filtering means for filtering the received stair-stepped sinusoidal waveforms;

    a means for discriminating a valid received signal over noise by comparing an unvalidated received signal from the twisted pair lines against a pre-determined threshold; and

    .a means for detecting when the valid received signal crosses a reference voltage level.

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