Passive RFID tag and RFID system
AssigneeLapis Semiconductor Co., Ltd.
InventorShigeki Yamauchi
Life of this patent
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Abstract
A passive radio frequency identification (RFID) tag includes: a rectifier circuit that rectifies a signal obtained from an antenna and outputs the rectified signal as a DC voltage. A capacitor is connected to an output line of the rectifier circuit. A first regulator circuit generates a first regulator voltage by stabilizing the output DC voltage from the rectifier circuit. A control circuit starts operating when the first regulator voltage is applied, and the control circuit generates a control signal upon receipt of the modulation signal section of the wireless signal. A second regulator circuit generates a second regulator voltage by stabilizing the output DC voltage from the rectifier circuit in response to the control signal and outputs the second regulator voltage to the outside.
Claims9
A passive radio frequency identification (RFID) tag, comprising:
- a rectifier circuit connected to an antenna and configured to rectify a reception signal obtained from the antenna based on the antenna receiving a wireless signal, the rectifier circuit further configured to output a rectified reception signal as a direct current (DC) voltage to a power source line;
- a demodulation/modulation circuit connected to the power source line and configured to detect and demodulate the reception signal upon application thereto of the DC voltage to obtain reception data, and further configured to modulate transmission data and supply a resulting modulation signal to the antenna;
- a first regulator circuit connected to the power source line and configured to generate a first regulator voltage by stabilizing the DC voltage;
- a control circuit configured to begin operating based on receiving the first regulator voltage from the first regulator circuit, and configured to generate a control signal upon receipt of a modulation signal section of the wireless signal, the modulation signal section following a non-modulation signal section of the wireless signal;
- and
- a second regulator circuit connected to the power source line and configured to generate a second regulator voltage by stabilizing the DC voltage in response to the control signal, and further configured to output the second regulator voltage to outside the passive RFID tag.
A radio frequency identification (RFID) system, comprising:
- a reader/writer configured to transmit a wireless signal that includes a non-modulation signal section and a modulation signal section that immediately follows the non-modulation signal section;
- and
- a passive RFID tag configured to receive, through an antenna, the wireless signal that is transmitted from the reader/writer,
- wherein the passive RFID tag includes:
- a rectifier circuit connected to the antenna and configured to rectify a reception signal obtained from the antenna by reception of the wireless signal and output the rectified reception signal as a DC voltage to a power source line;
- a demodulation/modulation circuit connected to the power source line and configured to detect and demodulate the reception signal upon application thereto of the DC voltage to obtain reception data, and further configured to modulate transmission data and supply a resulting modulation signal to the antenna;
- a first regulator circuit connected to the power source line and configured to generate a first regulator voltage by stabilizing the DC voltage;
- a control circuit configured to begin operating based on receiving the first regulator voltage from the first regulator circuit, and configured to generate a control signal upon receipt of the modulation signal section of the wireless signal;
- and
- a second regulator circuit connected to the power source line and configured to generate a second regulator voltage by stabilizing the DC voltage in response to the control signal, and further configured to output the second regulator voltage to outside the passive RFID tag.
Dependencies are inferred from the claim text.