One point calibration integrated temperature sensor for wireless radio frequency applications
First Claim
1. An analog linear temperature sensor comprising:
- integrated temperature sensing elements configured to produce a differential output voltage that is linearly related to absolute temperature.
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Abstract
A low power analog linear temperature sensor integrateable with digital and/or analog circuits in CMOS fabrication processes. The sensor is accurately calibrateable at a single temperature that yields a linear relationship between measured differential voltage and temperature over a wide variety of temperature ranges. The sensor provides stable voltage and current references that are essential for wireless sensor platforms. There are many applications where sensors require stable voltage/current references and the physics of the sensor'"'"'s transduction mechanisms are themselves temperature dependent. Wireless platforms such as, but not limited to, passive RFID tags with the addition of on- or off-chip sensors provide a low cost solution for a variety of low cost sensor applications.
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Citations
28 Claims
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1. An analog linear temperature sensor comprising:
integrated temperature sensing elements configured to produce a differential output voltage that is linearly related to absolute temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A radio frequency identifier tag comprising:
analog linear temperature sensor formed of integrated temperature sensing elements configured to produce a differential voltage output of zero volts at absolute zero temperature whereby one point calibration is provided, said sensing elements being in communication with a wireless transceiver; and
said sensor being configured to provide at least one temperature independent voltage and/or current reference to on-chip or off-chip circuitry.- View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method for analyzing data associated with an environment and an object within the environment, said method comprising the steps of:
integrating an analog linear temperature sensor into a radio frequency identifier tag that includes a wireless transceiver, the sensor being formed of integrated temperature sensing elements configured to produce a differential voltage output of zero volts at absolute zero temperature whereby one point calibration is provided;
attaching the radio frequency identifier tag to the object;
providing an ambient temperature sensor for measuring the ambient temperature in said environment;
determining temperature data related to the object using the radio frequency identifier tag;
determining temperature data related to the environment using the ambient temperature sensor; and
analyzing the temperature data related to the environment and the object. - View Dependent Claims (26, 27, 28)
Specification