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OXIMETER WITH NULLED OP-AMP CURRENT FEEDBACK

  • US 20040030231A1
  • Filed: 08/08/2002
  • Published: 02/12/2004
  • Est. Priority Date: 08/08/2002
  • Status: Active Grant
First Claim
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1. A method of producing a diode drive current in an oximeter, comprising:

  • sensing at least a part of a current passing through the diode and converting the sensed current to a sensed voltage;

    inputting the sensed voltage to a feedback amplifier for stabilizing the current passing through the diode; and

    eliminating an offset voltage across inputs of the feedback amplifier.

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