US Patent No. 8,013,714, RFID sensor using pulse processing


This technology is about a radio frequency identification device having sensing elements incorporated in its tags, and the sensing value determines the width of a sensing pulse in its RFID code. Through a pulse-processing unit, during communication, digital sensing values are obtained by measuring the width of the sensing pulse. Since only discrete signals exist, the tag device is insensitive to the fluctuation in its power supply voltage, which is derived from a continuous wave RF carrier.

Uniqueness and benefits of this technology:
1. A mixed pulse sequence including discrete signals carrying analog sensing values and digital signals with ID information encoded is used for communication between sensing tags or sensing groups and an interrogator;
2. Sensing process is combined with communication process;
3. No analog signal exists in sensing tags and no ADC is required. Thereby sensing tags are insensitive to variations in supply voltage;
4. No oscillator is required in sensing tags.


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