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Method and device for modulating an active load

  • US 10,560,156 B2
  • Filed: 04/06/2018
  • Issued: 02/11/2020
  • Est. Priority Date: 09/21/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • producing, by an inductive antenna circuit, a first periodic signal that is based on an alternating external magnetic field;

    producing, by an oscillator circuit, a second periodic signal that is based on the first periodic signal;

    transmitting, in correspondence with a data-carrying modulation signal, a sequence of data bits of a data frame by sequentially and repetitively;

    applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit to transmit a portion of the data frame, the second periodic signal being applied to the inductive antenna circuit in response to the data-carrying modulation signal having a first logic value;

    after transmitting the portion of the data frame, inhibiting application of the second periodic signal to the inductive antenna circuit, application of the second periodic signal to the inductive antenna circuit being inhibited in response to the data-carrying modulation signal having a second logic value, the second logic value being opposite the first logic value; and

    during at least a portion of a period of time that application of the second periodic signal to the inductive antenna circuit is inhibited, placing the oscillator circuit in a synchronous oscillation mode, the placing the oscillator circuit in the synchronous oscillation mode resulting in the second periodic signal being synchronized to the first periodic signal.

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