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Subset selection of RFID tags using light

  • US 9,805,227 B2
  • Filed: 07/23/2015
  • Issued: 10/31/2017
  • Est. Priority Date: 04/07/2008
  • Status: Active Grant
First Claim
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1. A circuit to provide a direct current (DC) output voltage, comprising:

  • a first bias circuit to receive a radio frequency (RF) input;

    a first voltage multiplier circuit coupled to the first bias circuit, the first voltage multiplier circuit comprising a first transistor used as a rectifying element to generate the DC output voltage, the first bias circuit to generate a first bias voltage to reduce a turn on threshold voltage of the first transistor.

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