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Calibration methods and circuits for optimized on-die termination

  • US 7,408,378 B2
  • Filed: 11/23/2005
  • Issued: 08/05/2008
  • Est. Priority Date: 12/19/2003
  • Status: Active Grant
First Claim
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1. An integrated circuit die to communicate data over a plurality of communication channels, the integrated circuit die comprising:

  • a. a current source having a plurality of calibration-current output nodes providing a corresponding plurality of calibration currents;

    b. a plurality of pads to connect to the communication channels; and

    c. a plurality of communication circuits to communicate the data over the communication channels via the pads, each communication circuit including;

    i. a first calibration-circuit input node coupled to a respective one of the calibration-current output nodes and receiving one of the calibration currents;

    ii. a second calibration-circuit input node coupled to a reference resistor;

    iii. a calibration-circuit output port providing a termination-control signal; and

    iv. a termination element exhibiting a termination characteristic and including a termination control port coupled to the calibration-circuit output port and receiving the termination-control signal.

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