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Dynamically-adjustable differential output drivers

  • US 7,397,270 B1
  • Filed: 05/25/2005
  • Issued: 07/08/2008
  • Est. Priority Date: 09/24/2003
  • Status: Expired due to Fees
First Claim
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1. Dynamically adjustable differential output driver circuitry on an integrated circuit that transmits differential output data signals that have a peak-to-peak output voltage swing VOD, comprising:

  • adjustable current source circuitry;

    adjustable resistor circuitry;

    switching circuitry for switching current from the adjustable current source circuitry through the adjustable resistor circuitry to produce the differential output signals, wherein the adjustable current source circuitry and adjustable resistor circuitry are controlled independently in real time by control signals to adjust the peak-to-peak output voltage swing VOD of the differential output data signals; and

    dynamic control circuitry that generates the control signals, wherein the dynamic control circuitry is implemented at least partly using programmable logic circuitry, wherein the resistor circuitry comprises process and temperature compensation circuitry to compensate for process-induced and temperature-induced resistivity changes in the resistor circuitry, wherein the resistor circuitry comprises a plurality of variable resistors, and wherein each variable resistor comprises a plurality of parallel paths each having an associated resistor.

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