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A 13.56 MHz RF frontend with current-mode demodulator for wide input-power dynamic-range

: Fedtschenko, Tatjana; Stanitzki, Alexander; Kokozinski, Rainer; Schaal, Christopher; Müller, Kai-Uwe; Utz, Alexander; Ferres, Elischa


Sikorsky, I. ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 39th International Conference on Electronics and Nanotechnology, ELNANO 2019. Conference Proceedings : April 16-18, 2019, Kyiv, Ukraine
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-2066-9
ISBN: 978-1-7281-2065-2
ISBN: 978-1-7281-2064-5
International Conference on Electronics and Nanotechnology (ELNANO) <39, 2019, Kyiv>
Fraunhofer IMS ()
wireless; RFID; amplitude shift keying (ASK); current-mode demodulation; 13.56 MHz

This article presents the design of an analog RF frontend for a 13.56 MHz transponder which can operate in a wide range of input powers. The frontend allows wireless telemetric data transmission and also powers the whole system. Implemented in a 0.35 µm CMOS technology the design includes the full–wave rectifier with voltage limiter, low dropout regulators with bandgap reference, a current-mode ASK demodulator supporting modulation indices from 10 to 40 %, clock recovery circuit, and a digital protocol engine. The modulator and demodulator allow the application in ISO 18003 Mode 1 compliant systems. The incident power can range from 460 µW up to 460mW and resistive loads up to 1 kΩ can be applied. The current consumption of the analog frontend itself is only 150 µA and it occupies an area of 0.85 mm 2 in the chosen CMOS technology.