Pulse or digital communications – Receivers
Patent
1996-08-30
1999-08-17
Vo, Don N.
Pulse or digital communications
Receivers
375320, 455 41, 379 551, 235379, 235380, H03D 124
Patent
active
059404477
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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Connell Lawrence E.
Hollenbeck Neal W.
Paitl Kenneth A.
Egan Wayne J.
Motorola Inc.
Vo Don N.
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