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Circuitry and methods for current measurements referred to a precision impedance

  • US 7,103,487 B2
  • Filed: 07/06/2005
  • Issued: 09/05/2006
  • Est. Priority Date: 11/01/2001
  • Status: Expired due to Term
First Claim
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1. A circuit that determines a current supplied by an integrated circuit comprising:

  • a sensing impedance disposed on the integrated circuit;

    a modulation impedance;

    a first measurement device coupled to the sensing impedance configured to measure a voltage drop across the sensing impedance;

    a second measurement device coupled to the modulation impedance configured to measure voltage drop across the modulation impedance;

    a termination impedance;

    a third measurement device coupled to the termination impedance configured to measure a voltage drop across the termination impedance; and

    processing circuitry configured to receive information from the first, second, and third measurement devices and calculate supplied current therefrom.

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