Wireless powered communication device using power signal sampling and method
First Claim
1. In a wireless powered communication device wherein a receiver station provides a power signal at a power frequency and an amplitude-modulated data signal at a data carrier frequency to the wireless powered communication device, the wireless powered communication device being adapted to receive the power signal and the amplitude-modulated data signal, a method for recovering data from the amplitude-modulated data signal comprising the steps of:
- deriving a sampling clock frequency from the power signal;
sampling the amplitude-modulated data signal at the sampling clock frequency to provide a sampled signal, the sampling clock frequency being derived from the power signal;
filtering the sampled signal to provide a filtered signal; and
demodulating the filtered signal to provide an output data signal.
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Accused Products
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).
39 Citations
14 Claims
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1. In a wireless powered communication device wherein a receiver station provides a power signal at a power frequency and an amplitude-modulated data signal at a data carrier frequency to the wireless powered communication device, the wireless powered communication device being adapted to receive the power signal and the amplitude-modulated data signal, a method for recovering data from the amplitude-modulated data signal comprising the steps of:
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deriving a sampling clock frequency from the power signal; sampling the amplitude-modulated data signal at the sampling clock frequency to provide a sampled signal, the sampling clock frequency being derived from the power signal; filtering the sampled signal to provide a filtered signal; and demodulating the filtered signal to provide an output data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless powered communication apparatus wherein a receiver station provides a power signal at a power frequency and an amplitude-modulated data signal at a data carrier frequency to the wireless powered communication apparatus, the wireless powered communication apparatus being adapted to receive the power signal and the amplitude-modulated data signal, the wireless powered communication apparatus including recovering means for recovering data from the amplitude-modulated data signal, the recovering means comprising:
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deriving means for deriving a sampling clock frequency from the power signal; sampling means for sampling the amplitude-modulated data signal at the sampling clock frequency to provide a sampled signal, the sampling clock frequency being derived from the power signal; filtering means for filtering the sampled signal to provide a filtered signal; and demodulating means for demodulating the filtered signal to provide an output data signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification