An Ultra Low-Power Solution for EEPROM in Passive UHF RFID Tag IC With a Novel Read Circuit and a Time-Divided Charge Pump

作者：Du, Yongqian^*; Zhuang, Yiqi; Li, Xiaoming; Liu, Weifeng; Li, Zhenrong; Qi, Zengwei

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2013, 60(8): 2177-2186.

DOI：10.1109/TCSI.2013.2239095

• Charge pump
• EEPROM
• low-power
• read circuit
• sense amplifier
• tag
• UHF RFID

A dual power supply ultra low-power 1 kbits EEPROM for passive UHF RFID is presented. The read power source is 1 V, while the write power source is 1.65 V, which is only activated in the write mode. To reduce the power of the read circuit without impacting the performance, a pre-charge scheme, a feedback scheme and a self-detect circuit, combined with a special read time sequence are adopted. A time-divided charge pump is proposed to reduce the current surge of the charge pump at the startup phase. The EEPROM IP has been fabricated in a SMIC 0.18 mu m 2P4M EEPROM process. The die size of the proposed EEPROM IP is 0.12 mm(2). The read and write currents of the EEPROM IP are 1.18 mu A and 33 mu A respectively. Under a 110 degrees temperature variation, the power variation of the read operation is 15%. The EEPROMIP is then verified in a full UHF RFID chip. Tested by a commercial reader at 4 W EIRP, the maximum read and write communication ranges are 6 m and 3 m respectively. The measured voltage drop of the output of rectifier Vrect caused by the current surge of the charge pump is smaller than 50 mV.

• 出版日期2013-8
• 单位西安电子科技大学