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Passive RF tag with power cycling

  • US 9,317,723 B2
  • Filed: 04/03/2014
  • Issued: 04/19/2016
  • Est. Priority Date: 04/03/2014
  • Status: Active Grant
First Claim
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1. A method of operating a passive integrated circuit when the passive integrated circuit is in communication with a radio frequency (RF) probe, the passive integrated circuit being housed in a package that includes a surface feature matching a feature of the RF probe to facilitate alignment of first and second conductive coils on the passive integrated circuit with corresponding coils on the RF probe, the method comprising:

  • receiving radio frequency (RF) energy at a first frequency from the first conductive coil having a plurality of turns affixed to the integrated circuit when the first conductive coil is aligned with a corresponding first conductive coil on the RF probe;

    conditioning the radio frequency energy to power digital circuitry in the passive integrated circuit; and

    transmitting data using the second conductive coil having a plurality of turns affixed to the integrated circuit when reception of radio frequency energy at the first frequency using the first conductive coil has stopped, and when the second conductive coil is aligned with a corresponding second conductive coil on the RF probe.

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