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US 8,803,592 B2Granted
Data persistence control apparatus for RFID tag
AssigneeLsis Co., Ltd.
InventorChel Ho Chung
Life of this patent
Estimating the term…
Abstract
A data persistence control apparatus for an RFID tag is provided. The apparatus includes a capacitor to be charged, a charge circuit to charge the capacitor, a discharge circuit to discharge the capacitor, a switch switched on to electrically connect the charge circuit to the capacitor or the discharge circuit to the capacitor, and an output circuit to output a logic high signal or a logic low signal according to an input voltage determined based on a discharged degree of the capacitor.
Claims14
A data persistence control apparatus for an RFID tag, the apparatus comprising:
- a capacitor for storing electrical energy that retains a preset value when the RFID tag is powered on;
- a charge circuit for charging the capacitor;
- a discharge circuit for discharging the capacitor;
- a switch for electrically connecting either the charge circuit or the discharge circuit to the capacitor when the switch is in an on state;
- an output circuit for outputting a logic high signal or a logic low signal according to an input voltage that is determined based on a degree of discharge of the capacitor;
- and
- a control circuit for controlling the charge circuit, the discharge circuit and the switch by receiving an input signal and an enable signal, the control circuit comprising
- a first NOT gate for receiving the input signal;
- a buffer for receiving the enable signal;
- a first NAND gate that has a first input terminal connected to an output terminal of the first NOT gate and a second input terminal connected to an output terminal of the buffer;
- a second NAND gate that has a first input terminal connected to the output terminal of the buffer, a second input terminal connected to an input terminal of the first NOT gate and an output terminal connected to the charge circuit;
- and
- a second NOT gate that has an input terminal connected to the output terminal of the first NAND gate and an output terminal connected to the discharge circuit.
10 more elements
Dependencies are inferred from the claim text.