Integrated circuits with persistent data storage
First Claim
1. A one shot circuit having a timing interval that is maintained constant independent of power fluctuations that occur during the timing interval, wherein the circuit forms a portion of an REID device, and wherein the circuit comprises:
- a transistor;
a dielectric charge storage portion coupled to the transistor to store a dielectric capacitance; and
ajunction capacitance portion coupled to the transistor to store a junction capacitance;
wherein the dielectric capacitance is at least 10 times greater than the junction capacitance.
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Accused Products
Abstract
The circuitry introduced in this invention selectively slows down the functioning of an electronic circuit by maintaining a particular state for a prolonged period of time. This circuitry is used not only to achieve the desired effect in maintaining security from electronic thieves trying to circumvent codes but also in other applications such as enabling a circuit to continue to function in the event of a brief loss of power. For example, in an RFID system, if a reader is frequency hopping, a tag loses power for as long as about 400 milliseconds when the reader changes to other frequencies. In a preferred embodiment, the disclosed circuitry is used in conjunction with a destruct sequence.
78 Citations
19 Claims
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1. A one shot circuit having a timing interval that is maintained constant independent of power fluctuations that occur during the timing interval, wherein the circuit forms a portion of an REID device, and wherein the circuit comprises:
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a transistor; a dielectric charge storage portion coupled to the transistor to store a dielectric capacitance; and ajunction capacitance portion coupled to the transistor to store a junction capacitance; wherein the dielectric capacitance is at least 10 times greater than the junction capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A one-shot circuit having a timing interval of greater than one second at room termperature independent of power fluctuations, wherein the circuit forms a portion of an RFID device, and wherein the circuit comprises:
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a transistor; a dielectric charge storage portion coupled to the transistor to store a dielectric capacitance; and a junction capacitance portion coupled to the transistor to store a junction capacitance; wherein the dielectric capacitance is at least 10 times greater than the junction capacitance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A one shot circuit having a timing interval that is maintained constant independent of power fluctuations that occur during the timing interval, wherein the circuit comprises:
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a transistor; a dielectric charge storage portion coupled to the transistor to store a dielectric capacitance; and a junction capacitance portion coupled to the transistor to store a junction capacitance; wherein the dielectric capacitance is at least 10 times greater than the junction capacitance.
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19. A one-shot circuit having a timing interval of greater than one second at room temperature independent of power fluctuations, wherein the circuit comprises:
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a transistor; a dielectric charge storage portion coupled to the transistor to store a dielectric capacitance; and a junction capacitance portion coupled to the transistor to store a junction capacitance; wherein the dielectric capacitance is at least 10 times greater than the junction capacitance.
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Specification