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Method for synchronizing an active load modulation clock within a transponder, and corresponding transponder

  • US 10,560,255 B2
  • Filed: 07/06/2018
  • Issued: 02/11/2020
  • Est. Priority Date: 07/12/2017
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • generating an active load modulation (ALM) carrier clock of a transponder synchronized to a carrier clock of a reader using a digital phase locked loop (DPLL), the DPLL having a frequency which is a multiple N of a frequency of the carrier clock of the reader, where N is an integer value; and

    transmitting data frames from the transponder to the reader using the ALM carrier clock, the generating the ALM carrier clock including;

    between transmission of data frames, placing said DPLL in a lock mode of operation in which a feedback loop is closed; and

    within a transmitted data frame having a duration,placing, for the duration of the transmitted data frame, said DPLL in a hold mode of operation in which the feedback loop is opened; and

    adjusting a phase of said ALM carrier clock at least one time during the duration of the transmitted data frame.

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