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Utilizing oscillator frequency divider settings as a temperature sensor in radio frequency applications

  • US 9,024,727 B1
  • Filed: 05/24/2013
  • Issued: 05/05/2015
  • Est. Priority Date: 05/24/2013
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • transmitting, by a reader device, a radio frequency (RF) signal to a tag device, wherein the tag device includes an electronic oscillator configured to generate an oscillator signal with an oscillator frequency and further includes a frequency adjuster configured to adjust the oscillator frequency with a frequency adjustment factor to provide a resulting frequency, wherein the oscillator frequency is dependent on a temperature of the tag device, and wherein the resulting frequency is based on a reference frequency provided by the RF signal;

    receiving, by the reader device, data from the tag device, wherein the data from the tag device comprises data indicative of the oscillator frequency; and

    determining, by the reader device, an estimate of the temperature of the tag device based on at least the data and a predetermined relationship between temperature and oscillator frequency.

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