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LED drive circuit for pulse oximetry and method for using same

  • US 8,366,613 B2
  • Filed: 12/24/2008
  • Issued: 02/05/2013
  • Est. Priority Date: 12/26/2007
  • Status: Active Grant
First Claim
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1. An LED drive circuit for a pulse oximeter comprising:

  • a first current mirror configured to supply a first current to activate a first LED of a pulse oximetry sensor, wherein the first current mirror comprises three NPN bipolar junction transistors (BJTs), wherein a first and second NPN BJTs of the current mirror have their respective base leads electrically coupled together, wherein the first NPN BJT of the current mirror is coupled to a DAC output of a microcontroller.

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