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Self tuning RFID

  • US 8,836,512 B2
  • Filed: 07/28/2008
  • Issued: 09/16/2014
  • Est. Priority Date: 07/28/2008
  • Status: Active Grant
First Claim
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1. An RFID tag having self tuning, comprising:

  • a charge pump having multiple taps;

    an antenna;

    an antenna impedance matching circuit coupled to the antenna and including a plurality of reactive components that are selectively connectable to the antenna;

    a first digital control loop configured to cause the RFID tag to cycle through successive taps of the charge pump to control a resistive impedance match for the antenna and a charge pump output voltage;

    a second digital control loop configured to increase the charge pump output voltage by controlling connection of the reactive components to the antenna and a reactive impedance match for the antenna; and

    an indicator to the second digital control loop indicating a status of the first digital control loop cycle, wherein the reactive components of the antenna impedance matching circuit are connected to the antenna in response to the indication.

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