Apparatus and method for detuning of RFID tag to regulate voltage
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United States of America Patent
Stats
-
May 8, 2001
Issued Date -
N/A
app pub date -
Jun 23, 2000
filing date -
Jun 23, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Overload protection is provided to the tuned receiving front end circuitry of an RFID tag by selectively detuning the tuned receiving front end in response to sensed voltage overload generated across the tuned receiving front end by a high field. The tuned receiving front end is or is modeled as a tuned parallel inductor and capacitor tank circuit. A parallel capacitance is added to the tank circuit by means of a control transistor which is controlled by a voltage sensing circuit. The voltage sensing circuit senses the voltage being applied across the tank circuit and turns on the control transistor to a degree to sufficiently detune the tank circuit so that the operating voltage across the tank circuit remains at or below a desired operating value or safe limit regardless of the value of the field in which the RFID tag is placed.
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