A 0.35mm$^2$ 94.25$\upmu$W Fully Integrated NFC Tag IC Using 0.13$\upmu$m CMOS Process

An NFC tag chip employing the ISO/IEC14443-A protocol is developed in SMIC 0.13 $\upmu$ m EEPROM 2P6M CMOS process, boasting a chip area of 620.03 $\upmu$ m $\times$ 567.93 $\upmu$ m and a power consumption of under 100 $\upmu$ W. The chip addresses critical issues such as reducing power consumption and minimizing area costs for covering numerous IoT nodes. For a small area of the chip, a specialized ESD protection circuit is proposed, efficiently multiplexing discharge transistors, cross-gate connected rectifiers, limiters for overvoltage protection, and load switch modulators within the chip's limited space. For power efficiency, a compact 175.44 $\upmu$ m $\times$ 32.98 $\upmu$ m 18.52 $\upmu$ A LDO based on the current mirror and current feedback is presented for the DC supply during the 100% ASK modulation. Additionally, an ASK demodulator and a 13.56MHz $\pm$ kHz clock generator are designed in compact areas of 62.19 $\upmu$ m $\times$ 56.06 $\upmu$ m and 24.76 $\upmu$ m $\times$ 13.14 $\upmu$ m, respectively. These components ensure stable protocol communication with digital circuits and support a 7kb EEPROM, providing a comprehensive solution for NFC-based IoT information collection.