NFC DEVICE HAVING A DIFFERENTIAL INPUT ENVELOPE DETECTOR
First Claim
1. A method of manufacturing a system comprising:
- coupling a Near Field Communication (NFC) antenna to a differential input envelope detector.
2 Assignments
0 Petitions
Accused Products
Abstract
A differential input envelope detector receives an unamplified Near Field Communication (NFC) input signal from an NFC antenna and downconverts an NFC intelligence signal to baseband. In one example, the NFC input signal includes the NFC intelligence signal modulated onto a carrier. The differential input envelope detector downconverts and outputs the downconverted NFC intelligence signal onto an output node in such a way that the fundamental and odd harmonics of the carrier are canceled on the output node. There is substantially no signal of the frequency of the carrier present on the output node and this facilitates filtering of the downconverted NFC intelligence signal from interference and data recovery. An NFC data recovery circuit receives the downconverted NFC intelligence signal from the envelope detector output node. The NFC data recovery circuit can be a low power digital circuit involving an ultra-low power ADC and subsequent low power digital processing circuitry.
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Citations
29 Claims
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1. A method of manufacturing a system comprising:
coupling a Near Field Communication (NFC) antenna to a differential input envelope detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of manufacturing an integrated circuit comprising:
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providing a first terminal adapted to receive a first signal from a Near Field Communication (NFC) antenna; providing a second terminal adapted to receive a second signal from the NFC antenna; and fabricating a differential input envelope detector such that a first input lead of the differential input envelope detector is coupled to the first terminal and such that a second input lead of the differential input envelope detector is coupled to the second terminal, wherein the first terminal, the second terminal and the differential input envelope detector are parts of the integrated circuit. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An integrated circuit comprising:
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a first terminal; a second terminal; a differential input envelope detector circuit coupled to receive a first signal from the first terminal and coupled to receive a second signal from the second terminal; and a Near Field Communication (NFC) data recovery circuit coupled to receive a signal from the differential input envelope detector circuit. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus comprising:
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means for receiving an unamplified differential Near Field Communication (NFC) input signal from an NFC antenna and for performing frequency demodulation such that an NFC intelligence signal is downconverted, wherein the NFC input signal includes the NFC intelligence signal modulated on a carrier signal, wherein the carrier signal has a frequency, and wherein the means is also for outputting the downconverted NFC intelligence signal onto an output node with substantially no signal of the frequency being present on the output node; and a Near Field Communication (NFC) data recovery circuit that receives the downconverted NFC intelligence signal from the output node. - View Dependent Claims (27, 28, 29)
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Specification