Method and apparatus for controlled persistent ID flag for RFID applications
First Claim
1. A Radio-Frequency Identification (RFID) transponder including:
- an identification flag circuit to maintain an RFID transponder state, the identification flag circuit including a first capacitor and a digital element coupled to the first capacitor to receive a voltage of the first capacitor; and
a discharge circuit to drain the first capacitor via a discharge current that is distinct from a semiconductor leakage current.
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Accused Products
Abstract
A Radio-Frequency Identification (RFID) transponder is provided. The RFID transponder may include a basic ID flag circuit having a VDD voltage node, an output voltage node, and a capacitor coupled to the VDD voltage node and the output voltage node to store an ID flag. A supplemental discharge current circuit coupled to the basic ID flag circuit is provided in order to control persistence duration of the state of the ID flag. The persistence duration of the state of the ID flag is controlled by maintaining supplemental discharge current, which is greater than the leakage current of the basic ID flag circuit.
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Citations
41 Claims
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1. A Radio-Frequency Identification (RFID) transponder including:
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an identification flag circuit to maintain an RFID transponder state, the identification flag circuit including a first capacitor and a digital element coupled to the first capacitor to receive a voltage of the first capacitor; and
a discharge circuit to drain the first capacitor via a discharge current that is distinct from a semiconductor leakage current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method to control persistence of an RFID transponder state, comprising:
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charging to a supply voltage a capacitor operative to indicate the RFID transponder state; and
draining the capacitor with a discharge current distinct from a semiconductor leakage current from an open switch. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A device to control persistence of an RFID transponder state, comprising:
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means for charging to a supply voltage a capacitor operative to indicate the RFID transponder state; and
means for draining the capacitor with a discharge current distinct from a semiconductor leakage current from an open switch. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification