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Method and Device for Active Load Modulation by Inductive Coupling

  • US 20120071089A1
  • Filed: 09/19/2011
  • Published: 03/22/2012
  • Est. Priority Date: 09/21/2010
  • Status: Active Grant
First Claim
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1. A method of emitting data by inductive coupling, the method comprising:

  • receiving an antenna signal using an inductive antenna circuit in the presence of an alternating external magnetic field,extracting from the antenna signal a first periodic signal,producing a second periodic signal using a synchronous oscillator having a synchronization input receiving the first periodic signal, the oscillator having a synchronous oscillation mode set in phase with the first periodic signal and a free oscillation mode,applying to the antenna circuit bursts of the second periodic signal to generate an active load modulation magnetic field,placing the oscillator in the synchronous oscillation mode before each application of a burst of the second periodic signal to the antenna circuit, andplacing the oscillator in a free oscillation mode during the application of a burst of the second periodic signal to the antenna circuit.

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