为了提高无源超高频(UHF)射频识别(RFID)标签的灵敏度和增大工作距离,设计了一种高灵敏度的ASK解调器。在该解调器的包络检波电路中,采用了开启电压补偿技术,以减小电荷传输管的导通压降;并设计了一种无二极管无电阻的参考电平产生电路。基于0.18μm标准CMOS工艺实现了该解调器,其芯片面积为0.010 mm2,满足第2代第1类UHF RFID通讯协议(EPC C1G2)的要求。测试结果表明,当载波频率为900 MHz、调制深度为80%~100%、数据率为26.7~128 kbit/s时,解调器能够解调信号的能量强度范围为-16~+20 dBm。在工作电压为0.8 V时,其功耗仅为0.56μW。 In order to improve the sensitivity of passive UHF RFID tags and increase the working distance, a highly sensitive ASK demodulator is designed. In the demodulator envelope detection circuit, a turn-on voltage compensation technique is adopted to reduce the voltage drop of the charge transfer tube. A diode-free reference level generation circuit is also designed. The demodulator, based on a 0.18μm standard CMOS process, has a chip area of ​​0.010 mm2 and meets the requirements of Gen 2 UHF RFID Communication Protocol (EPC C1G2). The test results show that when the carrier frequency is 900 MHz, the modulation depth is 80% ~ 100%, and the data rate is 26.7 ~ 128 kbit / s, the demodulator can demodulate the signal with energy range of -16 ~ +20 dBm. At operating voltage of 0.8 V, its power consumption is only 0.56μW.