Carrier supression in a NFC receiver
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United States of America Patent
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Feb 21, 2023
Grant Date -
N/A
app pub date -
Aug 31, 2021
filing date -
Sep 30, 2020
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A near-field communication (NFC) receiver includes first and second input terminals for receiving first and second input signals having a modulated signal portion and a carrier signal portion. The receiver includes a digital-to-analog converter (DAC), a mixer, a track-and-hold (T&H) circuit, an amplifier, and an analog-to-digital converter. The mixer has a first input coupled to receive the first and second input signals and a second input coupled to receive a low frequency current from the DAC. The mixer subtracts the carrier portion from the first and second input signals using the DAC current at a level determined using a DSP in a feedback loop to approximate the carrier. The T&H circuit has an input coupled to receive the combined current and an output to provide a series of output samples. The ADC is coupled to receive the amplified output signal and to provide a digital representation of the amplified output signal.
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