Method for tuning an oscillating receiver circuit of a transponder built into a RFID system
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United States of America Patent
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-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Jul 12, 1999
filing date -
Sep 13, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a method for calibrating an oscillating receiver circuit of a transponder in an RFID system to resonance to the frequency of an inquiry signal transmitted by a reader, the oscillating receiver circuit comprising at least one inductive resistor and at least one capacitor. Immediately after the start of reception of the inquiry signal, capacitors are connected in increments to the capacitance of the oscillating receiver circuit until such time as the rectified, smoothed inquiry signal assumes a maximum voltage value. This active self-calibration is performed upon each initialization of the transponder but can also be addressed by having the reader send a special sequence to the transponder.
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