Radio frequency temperature sensor and method of calibrating temperature therefor
First Claim
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1. A radio frequency temperature sensor, comprising:
- a ring oscillator, adapted to generate an oscillating signal frequency varying corresponding to a measured temperature;
a memory, adapted to store an initial value;
a frequency counter, coupled to the memory and the ring oscillator and adapted to measure a temperature error in response to the measured temperature according to the initial value and the oscillating signal in a pre-set time;
a radio frequency transmission interface, serving as a transmission interface with a card reader; and
a micro-controller, coupled to the frequency counter, the memory and the radio frequency transmission interface, adapted to transmit the initial value to the frequency counter, control starting and ending of the pre-set time, read the temperature error and communicate with the card reader through the radio frequency transmission interface.
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Abstract
A radio frequency temperature sensor and a method of calibration temperature therefor are disclosed. An active radio frequency temperature sensor including a ring oscillator, a memory, a frequency counter, a radio frequency transmission interface and a micro-controller is used to calibrate and verify the efficacy of the radio frequency temperature sensor. Thereafter, a passive radio frequency temperature sensor including a regulator, a clock extractor, a ring oscillator, a memory, a frequency counter, a modulator and a state-machine is developed according to the verified results.
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Citations
10 Claims
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1. A radio frequency temperature sensor, comprising:
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a ring oscillator, adapted to generate an oscillating signal frequency varying corresponding to a measured temperature; a memory, adapted to store an initial value; a frequency counter, coupled to the memory and the ring oscillator and adapted to measure a temperature error in response to the measured temperature according to the initial value and the oscillating signal in a pre-set time; a radio frequency transmission interface, serving as a transmission interface with a card reader; and a micro-controller, coupled to the frequency counter, the memory and the radio frequency transmission interface, adapted to transmit the initial value to the frequency counter, control starting and ending of the pre-set time, read the temperature error and communicate with the card reader through the radio frequency transmission interface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio frequency temperature sensor, comprising:
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a regulator, adapted to receive and transform a oscillating current from an antenna into a working voltage of the radio frequency temperature sensor; a frequency extractor, adapted to generate a clock signal of the radio frequency temperature sensor according to a signal received from the antenna; a ring oscillator, adapted to generate an oscillating signal frequency corresponding to a measured temperature; a memory, adapted to store an initial value; a frequency counter, coupled to the memory and the ring oscillator and adapted to measure a temperature error in response with the measured temperature according to the initial value and the oscillating signal in a pre-set time; a modulator serving as a transmission interface with a card reader; and a state machine, coupled to the frequency counter, the memory and the modulator, adapted to transmit the initial value to the frequency counter, control starting and ending of the pre-set time, read the temperature error and communicate with the card reader through the modulator. - View Dependent Claims (9, 10)
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Specification