RFID sensor device based on pulse-processing
First Claim
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1. A radio frequency identification tag device, comprising:
- a clock generator having at least one sensing element incorporated for generating a clock signal with frequency changing with sensing values obtained from said at least one sensing element;
a logic circuit that generates a mixed code sequence by serially connecting a serial ID code to a leading code having at least one sensing pulse, the baud rate of said serial ID code and the width of said at least one sensing pulse change with the frequency of said clock signal generated by said clock generator;
a radio frequency tuned circuit; and
a circuit for loading and unloading said radio frequency tuned circuit with said mixed code sequence.
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Abstract
A radio frequency identification device having sensing elements incorporated in the clock generators of its tags, which generate a leading code and an identification code. In the interrogator, the leading code is detected and its pulse width is measured for calculating sensing values and the baud rate in receiving the identification code. No analog to digital converter is needed in digitizing sensing values and only discrete signals exist in sensing signal generation and communication. The tag device is insensitive to variations in its power supply voltage obtained from a continuous wave RF carrier.
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Citations
16 Claims
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1. A radio frequency identification tag device, comprising:
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a clock generator having at least one sensing element incorporated for generating a clock signal with frequency changing with sensing values obtained from said at least one sensing element; a logic circuit that generates a mixed code sequence by serially connecting a serial ID code to a leading code having at least one sensing pulse, the baud rate of said serial ID code and the width of said at least one sensing pulse change with the frequency of said clock signal generated by said clock generator; a radio frequency tuned circuit; and a circuit for loading and unloading said radio frequency tuned circuit with said mixed code sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency interrogator device, comprising a circuit that detects a mixed code sequence generated by a radio frequency identification tag device, said mixed code sequence is generated by serially connecting a serial ID code to a leading code having at least one sensing pulse, and the baud rate of said serial ID code and the width of said at least one sensing pulse change with the frequency of a clock signal generated by a clock generator, wherein said clock generator has at least one sensing element incorporated for generating said clock signal with frequency changing with sensing values obtained from said at least one sensing element;
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a pulse processing unit for measuring the width of said at least one sensing pulse in said leading code; a communication unit that obtains said ID code with the baud rate calculated using the pulse width measured by said pulse processing unit; and a sensing value processing unit that calculates sensing values using said ID code obtained with said communication unit and the pulse width measured by said processing unit. - View Dependent Claims (12, 13, 14, 15)
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16. A system for identifying and reading a sensor value, comprising:
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at least one radio frequency identification tag device including a clock generator having at least one sensing element incorporated for generating a clock signal with frequency changing with sensing values obtained from said at least one sensing element, a logic circuit that generates a mixed code sequence which includes by serially connecting a serial ID code to a leading code having at least one sensing pulse, and the baud rate of said serial ID code and the width of said at least one sensing pulse change with the frequency of said clock signal generated by said clock generator, a radio frequency tuned circuit, and a circuit for loading and unloading said radio frequency tuned circuit with said mixed code sequence; a radio frequency interrogator device having a circuit that detects said mixed code sequence generated by said at least one radio frequency identification tag device, a pulse processing unit for measuring the width of said sensing pulse in said leading code, a communication unit that obtains said ID code with the baud rate calculated using the pulse width measured by said pulse processing unit, and a sensing value processing unit that calculates sensing values based on said ID code obtained with said communication unit and the pulse width measured by said pulse processing unit.
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Specification