15.2 A flexible ISO14443-A compliant 7.5mW 128b metal-oxide NFC barcode tag with direct clock division circuit from 13.56MHz carrier

Flexible low-cost RFID/NFC tags have great potential to be embedded in everyday objects providing them a unique identifier or sensor readout facilitating the Internet-of-Everything, whereby a smartphone or tablet is the interface to the Internet-of-Things. The main challenge for flexible metal-oxide RFID tags is to fully comply with the ISO14443-A NFC standard to enable readout by standard NFC reader or handheld devices, due to the limited charge carrier mobility of the semiconductor and multiple sources of parameter variation caused by roughness, temperature and dimensional stability of the foils. Recent work by various groups [1–4] demonstrated only an incremental improvement in data rates from 50b/s to 396.5kb/s to be compatible with ISO14443 (105.9kb/s). In this work, we present a flexible metal-oxide NFC chip that is compliant with ISO14443-A, showcasing advancements on memory size, power consumption and a clock generation circuit.