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Electronically adjustable integrated circuit input/output termination method and apparatus

  • US 6,642,741 B2
  • Filed: 12/12/2001
  • Issued: 11/04/2003
  • Est. Priority Date: 06/01/2001
  • Status: Active Grant
First Claim
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1. In an integrated circuit, a termination circuit for a transmission line having a predetermined characteristic impedance, comprising:

  • a controllable impedance circuit, coupled to the transmission line;

    a reference impedance, external to the integrated circuit, having an impedance related to the characteristic impedance; and

    a control circuit, coupled to the reference impedance and the controllable impedance circuit, for conditioning the controllable impedance circuit to have the characteristic impedance responsive to the reference impedance.

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