Dynamic adjusting RFID demodulation circuit
First Claim
Patent Images
1. A method of operating a dynamic adjusting RFID demodulator circuit comprising:
- providing an envelope detector and an RC filter coupled to the envelope detector;
increasing a threshold of the RFID demodulator circuit in response to the power of an input modulated RF signal; and
comparing an output of the envelope detector to an output of the RC filter to provide a data output signal.
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Abstract
A dynamic adjusting RFID demodulator circuit includes an envelope detector having an input for receiving a modulated RF signal, a fixed reference generator coupled to the input of an RC filter, an RF level dependent signal path adding to the fixed reference level at higher RF energy levels, a comparator having a first input coupled to an output of the envelope detector, a second input coupled to an output of the RC filter, and an output for providing a data output signal.
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Citations
20 Claims
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1. A method of operating a dynamic adjusting RFID demodulator circuit comprising:
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providing an envelope detector and an RC filter coupled to the envelope detector; increasing a threshold of the RFID demodulator circuit in response to the power of an input modulated RF signal; and comparing an output of the envelope detector to an output of the RC filter to provide a data output signal. - View Dependent Claims (13, 14, 15)
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2. A dynamic adjusting RFID demodulator circuit comprising:
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an envelope detector and an RC filter coupled to the envelope detector a comparator having a first input coupled to an output of the envelope detector, a second input coupled to an output of the RC filter and an output for providing a data output signal, wherein the comparator has a threshold corresponding to the power of an input modulated RF signal. - View Dependent Claims (16, 17, 18, 19, 20)
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3. A dynamic adjusting RFID demodulator circuit comprising:
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an envelope detector having an input for receiving a modulated RF signal; a fixed reference coupled to the input of an RC filter; and a comparator having a first input coupled to an output of the envelope detector, a second input coupled to an output of the RC filter, and an output for providing a data output signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification