一款应用于超高频射频识别标签的低功耗电流模无源混频器  

Design of a Low Power Current-Driven Passive Mixer for UHF RFID Tag

作　　者：余运勇 谈熙[1] 闵昊[1] YU Yunyong;TAN Xi;MIN Hao(State Key Laboratory of ASIC ＆ Systems, Fudan University, Shanghai 201203, China)

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203

出　　处：《复旦学报（自然科学版）》2018年第2期228-235,242,共9页Journal of Fudan University：Natural Science

摘　　要：本文设计了一款应用于超高频射频识别标签的分裂低噪声跨导放大器的电流模无源混频器.这款电流模无源混频器的功耗低至2.2mW,包含跨阻放大器.在利用50%占空比本振信号的电流模无源混频器中,分裂的低噪声跨导放大器能够解决I/Q 2路镜像信号相互串扰的问题.因此,本文设计的电流模无源混频器能够继续利用50%占空比的本振信号,而不需要利用额外的电路将本振信号的占空比从50%变成25%,这样能够节省大量的功耗和面积.无源混频器前的阻抗匹配网络具有额外的电压增益,额外的电压增益能够抑制后级电路的噪声贡献,这有助于进一步节省无源混频器的功耗.这款无源混频器在SMIC 130nm CMOS工艺下流片.测试结果表明,无源混频器的电压转换增益为32.1dB,噪声系数为7.7dB,带内输入3阶交调点为-9.1dBm,功耗为2.2mW.芯片面积为0.32mm2.This paper presents a splitting low noise trans-conductance amplifier（LNTA）current-driven passive mixer for the ultra-high frequency radio frequency identification tag.The current-driven passive mixer in this paper uses the 50% duty cycle local oscillator（LO）instead of the 25% duty cycle LO,which can save much power and chip area.The splitting LNTA can stop the image current circulating between the I/Q paths.The matching network in front of the mixer has extra voltage gain to suppress the noise,which will also reduce the power consumption of the mixer.The mixer was fabricated in SMIC 130 nm CMOS technology.The test results shows that it exhibits 32.1 dB voltage gain and 7.7 dB noise figure.Its in-band input-referred third-order intercept point is-9.1 dBm and its power consumption is 2.2 mW.

关 键 词：射频识别 跨导放大器 电流模 无源混频器 

分 类 号：TN403[电子电信—微电子学与固体电子学]