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RFID tags with power rectifiers that have bias

  • US 20060197668A1
  • Filed: 09/26/2005
  • Published: 09/07/2006
  • Est. Priority Date: 02/22/2005
  • Status: Active Grant
First Claim
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1. An RFID circuit comprising:

  • first and second input nodes to render an alternating signal between them; and

    a power management unit having a plurality of successive stages, each stage having first and second control nodes coupled to the first and second input nodes respectively, a first one of the stages including;

    a first switching transistor having a gate and first and second non-controlling terminals, the non-controlling terminals of the first switching transistor being a source and a drain, the gate and the first non-controlling terminal being coupled to receive a first phase of the alternating signal from the first control node of the first stage, and wherein an additional first bias voltage is adapted to be applied between the first non-controlling terminal and the gate of the first switching transistor, and wherein a rectified voltage is adapted to be received between the first and the second non-controlling terminals.

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