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Passive RFID tags with integrated circuits using sub-threshold technology

  • US 9,589,224 B2
  • Filed: 12/02/2015
  • Issued: 03/07/2017
  • Est. Priority Date: 12/02/2014
  • Status: Active Grant
First Claim
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1. A method for operating a Radio Frequency Identification (“

  • RFID”

    ) transponder, comprising;

    performing energy harvesting operations by a voltage scavenging device of the RFID transponder to collect energy from a Radio Frequency (“

    RF”

    ) field and store the energy in an energy storage device of the voltage scavenging device;

    causing a switch to change positions, when the energy storage device is charged to a pre-determined voltage level, from(A) a first position in which a closed circuit is formed between an antenna and the voltage scavenging device, and(B) a second position in which (i) an open circuit is formed between the antenna and the voltage scavenging device and (ii) a closed circuit is formed between the antenna and a transceiver circuit of the RFID transponder;

    increasing or decreasing, by a voltage converter of the RFID transponder, a voltage level of a signal received from the voltage scavenging device to a sub-threshold voltage level that is at least one order of magnitude below a normal operating range for the RFID transponder; and

    supplying an operating voltage at the sub-threshold voltage level to at least the transceiver circuit.

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