Analogue, Mixed Signal, LSI


NFC analog front end

3 April 2013 Analogue, Mixed Signal, LSI

ams released the AS3922, a tag analog front end (AFE) which enables the operation of NFC on μSD, μSIM, SIM and other space-constrained carrier devices. The IC emulates an ISO14443A/B tag through active transmission of the tag’s response in synch with the reader’s carrier field. This overcomes the difficulties with using conventional passive load modulation in a μSD or μSIM card. The use of an AS3922 AFE provides for tag-to-reader communication at coupling factors one order of magnitude lower than is possible using conventional methods. As well as offering Active Boost functionality, the chip also features antenna auto tuning technology, Q factor adjustment and a low-impedance output driver with adjustable output power.



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