一种超外差低中频接收机射频前端的设计  

A Heterodyne Low IF Receiver Front End for Short Range Communication

作　　者：王磊[1] 唐长文[1] WANG Lei;TANG Zhangwen(ASIC＆ System State Key Laboratory, Fudan University, Shanghai, 201203, CHN)

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：《固体电子学研究与进展》2018年第2期111-115,131,共6页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(61376036);中国专用集成电路与系统重点实验室基金资助项目(2015MS010)

摘　　要：介绍了一种应用于5.8GHz频段的专用短距离无线通信接收机前端,采用超外差低中频正交架构,通过合理规划接收机前端两次混频的频率可以有效解决镜像干扰和两条正交通路的失配。该前端包括低功耗的噪声抵消的低噪声放大器,其负载采用电容电感谐振电路,谐振频率可调,并具有一定的工艺稳定性。第一次混频采用电压模式无源混频器,第二次混频采用电流模式无源混频器。提出了一种简单有效的用于混频开关的偏置电路,射频混频开关采用反馈的方式确定偏置电压,中频混频开关的直流电压利用跨阻放大器的输出共模电压分压得到。芯片于TSMC 180nm工艺下流片,前端电路的有效面积为0.1mm2,整个链路的接收灵敏度达到-65dBm,接收数据率可以达到256kbps,在1.8V的工作电压下,消耗10.8mA的电流。A 5.8 GHz dedicated short range wireless communication receiver was presented utilizing low-IF heterodyne architecture.Through the proper frequency planning of the front end,the image interference and I/Q mismatches can be effectively solved.The receiver front end includes low-power partial noise cancelling low-noise amplifiers with a load of LC resonator,which is frequency adjustable and has a certain stability of process.The first mixer is voltage mode passive mixer and the second mixer is current mode passive mixer.A simple and effective mixing switch bias circuit was proposed.The RF switch uses feedback to define the bias voltage.The DC voltage of the IF mixer is obtained by dividing the output common mode voltage of the TIAs.The chip was fabricated in TSMC 180 nm process and occupied an active area 0.1 mm2.The sensitivity of the complete data link is-65 dBm,and the data rate can reach 256 kbps.The front end module consumes 10.8 mA current at 1.8 Voperating voltage.

关 键 词：超外差低中频 5.8GHz窄带 射频前端 低功耗低成本 

分 类 号：TN432[电子电信—微电子学与固体电子学]