Wireless powered communication device using power signal sampling and method
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Aug 30, 1996
filing date -
Aug 30, 1996
priority date (Note) -
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Abstract
A circuit (34) for data recovery in a wireless powered communication device (10) obviates the need for the costly high power consumption filters of prior art devices by deriving a clock signal from the power coil (18), and then sampling the data coil (20) signal with the derived sampling clock. The step of deriving a clock signal from the power signal causes the component of the power signal present on the data signal to be aliased to DC which is then easily rejected with a low order high pass or bandpass filter (38). Furthermore, the data signal may be amplified to a desired level suitable for amplitude discrimination by a simple comparator circuit (40) with hysteresis. Demodulation of the data signal is easily accomplished in the digital domain using a digital demodulator (32).
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