| 摘要 |
A radio frequency identification (RFID) tag includes a tank circuit (120) for receiving a power signal transmitted on a radio frequency (RF) carrier by a remote interrogator unit. Information is conveyed from the tag to the interrogator by varying a resistive load (129) placed across the tank circuit as a function of data read from memory. Corresponding variations in the reflected signals are then detected by the interrogator. An overvoltage circuit (122) cooperates with a modulation circuit (117) for providing transmission of data even during an overvoltage condition, thus avoiding masking of the signal under such conditions.
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