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Hybrid binary/thermometer code for controlled-voltage integrated circuit output drivers

  • US 20050242830A1
  • Filed: 04/30/2004
  • Published: 11/03/2005
  • Est. Priority Date: 04/30/2004
  • Status: Active Grant
First Claim
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1. A variable impedance network for variably adjusting the output impedance of a node of a circuit, comprising:

  • one or more impedance legs electrically connected between a first voltage source and said node;

    a first set of switchable impedance legs programmably electrically connectable between said voltage source and said node by a first set of calibration signals each of which corresponds to a respective one or more of said switchable impedance legs in said first set of switchable impedance legs;

    a second set of switchable impedance legs programmably electrically connectable between said voltage source and said node by a second set of calibration signals each of which corresponds to a respective one or more of said switchable impedance legs in said second set of switchable impedance legs; and

    a controller which generates said first set of calibration signals and said second set of calibration signals, wherein said controller steps said first set of calibration signals according to a binary code and steps said second set of calibration signals according to a thermometer code once per full count iteration of said first set of calibration signals.

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