RFID device having nonvolatile ferroelectric memory device
View Patent ↗A RFID device having a nonvolatile ferroelectric memory regulates bit line capacitance to optimize a bit line sensing margin and minimize power consumption. The RFID device having an analog block adapted and configured to transmit and receive a radio frequency signal to/from an external communication apparatus, a digital block adapted and configured to receive a power voltage and the radio frequency signal from the analog block, transmit a response signal to the analog block and output a memory control signal, and a memory adapted and configured to store data and regulate bit line capacitance.
1. A RFID device having a memory comprising:
an analog block configured to transmit and receive a radio frequency signal to/from an external communication apparatus;
a digital block configured to receive a power voltage and the radio frequency signal from the analog block, to transmit a response signal to the analog block and to output a memory control signal; and
a memory including a bit line capacitance matching unit configured to regulate total capacitance of a bit line and a cell array block comprising a plurality of unit cells for storing data.
2. The RFID device according to claim 1 , wherein the memory further comprises:
a word line decoder configured to decode an address to select a word line corresponding to the cell array block;
an output block configured to sense and amplify data on a selected bit line of the cell array block or to transmit externally inputted data to the cell array block; and
a control block configured to receive a chip enable signal, an output enable signal and a write enable signal to output a control signal for read/write operations to the word line decoder and the output block.
3. The RFID device according to claim 2 , wherein the cell array block comprises:
a cell array configured to comprise the plurality of unit cells which are selected by the bit line, a word line and a plate line;
a plurality of sense amplifiers each configured to sense and amplify data on the bit line in response to a sense amplifier enable signal; and
a bit line equalization block configured to set the bit line at a predetermined voltage in response to a bit line equalization signal.
4. The RFID device according to claim 1 , wherein the bit line capacitance matching unit includes a plurality of discharge units connected to the bit line.
5. The RFID device according to claim 4 , wherein the bit line capacitance matching unit further comprises a switch configured to selectively connect the bit line to each of the plurality of discharge units respectively.
6. The RFID device according to claim 5 , wherein the sum of capacitance of each of the plurality of discharge units and intrinsic capacitance of the bit line is set to be identical to capacitance of the respective unit cells.
7. The RFID device according to claim 2 , wherein the unit cell comprises:
a ferroelectric cell capacitor configured to store data; and
a cell transistor configured to selectively connect the bit line to the ferroelectric cell capacitor depending on a voltage applied to the word line.
8. The RFID device according to claim 7 , wherein the ferroelectric cell capacitor has a ferroelectric layer.
9. The RFID device according to claim 1 , wherein the bit line capacitance matching unit regulates total capacitance of the bit line by summing an intrinsic capacitance of the bit line and a capacitance of the bit line capacitance matching unit.