Analysis and Design of a Quadrature Down-Conversion Mixer for UHF RFID Readers  

一种用于超高频RFID阅读器的正交下变频混频器的分析与设计(英文)

作　　者：倪熔华[1] 谈熙[1] 唐长文[1] 闵昊[1] 

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：《Journal of Semiconductors》2008年第6期1128-1135,共8页半导体学报（英文版）

基　　金：国家高技术研究发展计划资助项目(批准号:2007AA01Z282)~~

摘　　要：A quadrature mixer with a shared transconductor stage is analyzed,including voltage conversion gain, linearity, noise figure, and image rejection. The analysis indicates it has better performance than a conventional Gilbert mixer pair in commutating mode. A quadrature down-conversion mixer based on this topology is designed and optimized for an ultra high frequency RFID reader. Operating in the 915MHz ISM band, the presented quadrature mixer measures a conversion gain of 12.5dB,an IIP3 of 10dBm, an IIP2 of 58dBm, and an SSB noise figure of 17.6riB. The chip was fabricated in a 0. 18μm 1P6M RF CMOS process and consumes only 3mA of current from a 1.8V power supply.分析了共用跨导级的正交下变频混频器的性能,包括电压转换增益、线性度、噪声系数和镜象抑制比,分析表明其在电流开关模式下比传统的Gilbert混频器对具有更好的性能.设计并优化了一个基于共用跨导级结构的用于超高频RFID阅读器的正交下变频混频器.在915MHz频段上,该混频器测得12.5dB的转换增益,10dBm的IIP3 ,58dBm的IIP2和17.6dB的SSB噪声系数.芯片采用0.18μm 1P6M RF CMOS工艺实现,在1.8V的电源电压下仅消耗3mA电流.

关 键 词：quadrature mixer shared transconductor stage RFID reader CMOS low power high linearity 

分 类 号：TN773[电子电信—电路与系统]