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Programmable low-voltage differential signaling output driver

  • US 7,236,018 B1
  • Filed: 09/08/2004
  • Issued: 06/26/2007
  • Est. Priority Date: 09/08/2004
  • Status: Active Grant
First Claim
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1. A low-voltage differential signaling (LVDS) output driver comprising:

  • first and second input terminals for receiving a differential input signal;

    first and second output terminals for outputting a differential output signal;

    a programmable current source for providing a source current;

    a plurality of transistors for steering a majority of the source current as an output current out of one of the first and second output terminals; and

    impedance circuitry coupled between the first and second output terminals, wherein;

    the impedance of the impedance circuitry is programmable; and

    the current flowing through the impedance circuitry is programmable;

    said LVDS output driver further comprising;

    circuitry for tri-stating the differential output signal, said circuitry for tri-stating comprising a switch coupled to the programmable current source, wherein the switch is open to allow the source current to flow and closed to block the source current from flowing.

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