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Radio frequency identification transponder with a quadrupler or N-tupler circuit for efficient RF to DC conversion

  • US 7,158,091 B2
  • Filed: 02/22/2005
  • Issued: 01/02/2007
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. An apparatus comprising a radio frequency transponder which comprises:

  • an antenna for receiving power and signals from a radio frequency field, and for sending signals by backscattering power from the radio frequency field;

    transponder electronics connected to the antenna for receiving signals from the antenna and for controlling the antenna impedance for sending signals;

    a transponder power supply for receiving radio frequency power from the antenna;

    wherein the radio frequency power is rectified in a rectifier circuit, and wherein the rectifier circuit comprises at least a first rectifier stage for producing a substantial DC voltage, and at least a second rectifier stage for producing a DC voltage substantially greater than the DC voltage produced by the first rectifier stage; and

    wherein the parasitic capacitance of the second rectifier stage is less than 80% of the parasitic capacitance of the first rectifier stage.

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