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Termination impedance trimming circuit

  • US 6,424,200 B1
  • Filed: 06/12/2000
  • Issued: 07/23/2002
  • Est. Priority Date: 06/12/2000
  • Status: Expired due to Term
First Claim
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1. An apparatus, comprising:

  • a semiconductor chip;

    a variable termination circuit placed on said chip for providing a termination impedance; and

    a trim control circuit for providing a control signal to said variable termination circuit wherein said variable termination circuit provides said termination impedance in response to the control signal, whereby said trim control circuit adjusts for sheet rho resistivity variation on said chip by comparing at least one voltage drop across a reference impedance located on said chip with a voltage drop across an impedance located off said chip by causing a reference current of approximately same value to flow through said impedance located on said chip and said reference impedance located off said chip.

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