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RFID device with first clock for data acquisition and/or calibration of second clock

  • US 8,077,012 B2
  • Filed: 06/16/2006
  • Issued: 12/13/2011
  • Est. Priority Date: 06/16/2006
  • Status: Active Grant
First Claim
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1. A system embodied in a Radio Frequency Identification (RFID) device, comprising:

  • a first clock signal generator generating a first clock signal at a first frequency;

    a second clock signal generator generating a second clock signal at a second frequency that is higher than the first frequency;

    a real time clock portion receiving a signal from the first clock signal generator,the real time clock portion generating a real time clock signal based on the first clock signal; and

    a sensor for taking a sensor reading at a rate of the real time clock signal,wherein the first clock signal is used to calibrate the second clock signal generator, and further comprising logic for generating a digital calibration value when the second clock signal generator is calibrated using the first clock signal, the digital calibration value indicating a calibration setting of the second clock signal generator,wherein the second clock signal generator is used to modulate communication of the RFID device.

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