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An ASK Modulator and Antenna Driver for 13.56 MHz RFID Readers and NFC Devices
Junghyun CHO Kyung-Won MIN Shiho KIM
IEICE TRANSACTIONS on Communications
Publication Date: 2006/02/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Devices/Circuits for Communications
RFID reader, 13.56 MHz transmitter, NFC,
Full Text: PDF(510.2KB)>>
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.