一种用于UHF RFID标签的低功耗PIE解码与BLF生成电路

A Low-Power PIE decoder and BLF genarator for UHF RFID tag

提出了一种全新的低功耗PIE(Pulse Interval Encoded)解码及反向散射链路频率BLF(Backscatter Link Frequency)生成电路,用于符合EPC Gen2协议的无源超高频射频识别(UHF RFID)芯片。该电路在读写器发送命令时,产生控制信号。所产生信号控制两个积分器生成三个比较电压,并通过两个比较器进行比较,完成对PIE信号的解码;同时控制另一积分器,产生参考电压,控制弛张振荡器生成符合协议要求的BLF。基于TSMC0.18μm CMOS工艺的仿真结果表明,本文所提出电路在1V工作电压下功耗为1.36μW,采用该结构的芯片可以提高工作距离以及读取速率。

In this paper,a novel low power PIE（Pulse Interval Encoded） decoder and backscatter link frequency（BLF） generator for UHF RFID transponders which meet the EPC Gen2 UHF RFID protocol are presented.Control signals are generated when the reader sends commands.Two integrators controlled by the control signals generate three voltages.By comparing these 3 voltages with two comparators,the circuits decode the PIE signal.Another integrator controlled by the control signals generates a reference voltage which makes a relaxation oscillator output a BLF that meets the Gen2 protocol.The simulation results under TSMC 0.18μm CMOS technology show that the total power of the proposed circuits is 1.36μW at 1V operating voltage.As a result,the tag with the proposed circuits can acquire longer read range and higher read rates.