An ASK Modulator and Antenna Driver for 13.56 MHz RFID Readers and NFC Devices

Junghyun CHO  Kyung-Won MIN  Shiho KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.2   pp.598-600
Publication Date: 2006/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.2.598
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Devices/Circuits for Communications
Keyword: 
RFID reader,  13.56 MHz transmitter,  NFC,  

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Summary: 
We propose an ASK modulator and Antenna driver for multi-standard 13.56 MHz RFID readers and NFC devices. The proposed transmitters of RFID readers and NFC devices consist of ASK modulator, inverting output driving buffer and off-chip antenna with a matching circuit. The ASK modulation depth can easily be controlled by adjusting duty ratio by the delay line circuit. The test chip was fabricated by using a 0.35 µm double poly CMOS process. The measured results demonstrated that the proposed circuit has met the standard specifications.