NFC DEVICE HAVING A DIFFERENTIAL INPUT ENVELOPE DETECTOR
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United States of America Patent
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Issued Date -
Apr 5, 2012
app pub date -
Oct 4, 2010
filing date -
Oct 4, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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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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