Integrated circuits with persistent data storage
First Claim
1. A radio frequency identification device comprising:
- a folded-dipole antenna; and
an integrated circuit, the integrated circuit comprising;
a first circuit to backscatter modulate a radio frequency signal, the radio frequency signal providing power to the device; and
a second circuit having a timing interval that is maintained constant independent of a loss of power to the device during the timing interval, the timing interval being at least 1 second.
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Accused Products
Abstract
The circuitry introduced in this invention selectively slows down the functioning of an electronic circuit 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.
89 Citations
20 Claims
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1. A radio frequency identification device comprising:
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a folded-dipole antenna; and an integrated circuit, the integrated circuit comprising; a first circuit to backscatter modulate a radio frequency signal, the radio frequency signal providing power to the device; and a second circuit having a timing interval that is maintained constant independent of a loss of power to the device during the timing interval, the timing interval being at least 1 second. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio frequency identification device comprising:
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an antenna; a first circuit to backscatter modulate a radio frequency signal, the radio frequency signal providing power to the device; and a second circuit having a timing interval during which a state of the second circuit is maintained constant independent of a loss of power to the device during the timing interval, the timing interval being at least 1 second. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A radio frequency identification device comprising:
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a loop antenna; a first circuit to modulate a radio frequency signal, the radio frequency signal providing power to the device; a second circuit having a timing interval during which a state of the second circuit is maintained constant independent of a loss of power to the device during the timing interval, the timing interval being at least 1 second. - View Dependent Claims (17, 18, 19, 20)
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Specification