适用于13.56MHz无源射频标签的稳压电路

A Voltage Regulator Circuit for 13.56MHz Passive RFID Tag

介绍了一种用于13.56 MHz射频标签的新颖稳压电路结构。采用双路负反馈的方式,分别控制电荷泵两端的电压,可使输出电压稳定在2.8 V;防过压击穿保护电路可使传输管承受高达13 V的感应电压而不被击穿;自动节能电路可防止输出电容上的有限电荷倒流入天线。系统仿真采用华虹NEC的EF130工艺。仿真结果表明：当输入天线电压处于3~7 V之间时,输出电压在2.813~2.826 V之间,完全满足13.56 MHz射频标签中数字模块和EEPROM的电压要求。

A novel voltage regulator was designed for 13.56 MHz passive RFID tags by using 0.13 μm analog CMOS technology.The output voltage of the circuit could be stabilized at 2.8 V by using double-end negative feedback circuit to control voltages at both ends of the charge pump separately.The over-voltage protection circuit could prevent bypass NMOS transistors from breakdown by induced voltage up to 13 V,and the self energy-saving circuit could keep limited electric charges from flowing backwards to the antenna.The circuit was simulated based on Huahong-NEC＇s EF130 process.Simulation results showed that the proposed regulator could operate in a wide range of input voltages from 3 V to 7 V,and output voltages between 2.813 V and 2.826 V,which meet the voltage requirement for baseband and EEPROM in 13.56 MHz RFID tag.