A 0.35mm2 94.25μ W Fully Integrated NFC Tag IC Using 0.13μ m CMOS Process

An NFC tag chip employing the ISO/IEC14443-A protocol is developed in SMIC <inline-formula> <tex-math notation="LaTeX">$0.13\mu \text{m}$ </tex-math></inline-formula> EEPROM 2P6M CMOS process, boasting a chip area of <inline-formula> <tex-math notation="LaTeX">$620.03\mu \text{m}\times 567.93\mu \text{m}$ </tex-math></inline-formula> and a power consumption of under <inline-formula> <tex-math notation="LaTeX">$100\mu \text{W}$ </tex-math></inline-formula>. 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 <inline-formula> <tex-math notation="LaTeX">$175.44\mu \text{m}\times 32.98\mu \text{m}\,\,18.52\mu \text{A}$ </tex-math></inline-formula> 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±kHz clock generator are designed in compact areas of <inline-formula> <tex-math notation="LaTeX">$62.19\mu \text{m}\times 56.06\mu \text{m}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$24.76\mu \text{m}\times 13.14\mu \text{m}$ </tex-math></inline-formula>, 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.