NOVEL NFC RECEIVER ARCHITECTURE WITH IMPROVED POWER SENSITIVITY

摘要

An electronic communication device includes an antenna configured to receive a radio frequency (RF) signal and generate a differential current signal at a first tag pin and a second tag pin. A first variable resistor is coupled to the first tag pin and a second variable resistor is coupled to the second tag pin. A mixer circuit is coupled across the first variable resistor and the second variable resistor and is configured to generate an output voltage. The output voltage is used for RF signal detection at all RF signal levels.

主权项

1. A method of detecting an RF (radio frequency) signal in an NFC (near field communication) device comprising:
receiving the RF signal; generating a differential current signal from the RF signal; generating a differential voltage from the differential current signal; downconverting the differential voltage to generate an output voltage; and detecting the RF signal from the output voltage.