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Modable dynamic terminator for high speed digital communications

  • US 20040246021A1
  • Filed: 06/05/2003
  • Published: 12/09/2004
  • Est. Priority Date: 06/05/2003
  • Status: Active Grant
First Claim
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1. A terminator circuit for terminating an electrical connection, the terminator circuit comprising:

  • at least one pull-up circuit connected between a higher-voltage supply rail and the electrical connection, wherein the at least one pull-up circuit turns on in response to a voltage at the electrical connection dropping below a lower threshold value;

    at least one pull-down circuit connected between the electrical connection and a lower-voltage supply rail, wherein the at least one pull-down circuit turns on in response to the voltage at the electrical connection exceeding an upper threshold value;

    biasing circuitry connected to the at least one pull-up circuit and the at least one pull-down circuit, wherein the biasing circuitry generates bias signals that determine the lower threshold value and the upper threshold value; and

    logic circuitry connected to the biasing circuitry, wherein the logic circuitry receives as an input a designation of a mode for the terminator circuit selected from a plurality of modes, and wherein the logic circuitry directs the biasing circuitry to produce bias signals that correspond to the mode designated by the input to the logic circuitry.

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