一种用于大规模无线传感网RF前端电路的dB线性可编程增益放大器  

A CMOS Linear-in-dB Programmable Gain Amplifier for the RF Front-end Circuits of Large Scale Wireless Sensor Network

作　　者：黄晓辉[1] 杨靖华[2] 郭桂良[2] 杜占坤[2] 阎跃鹏[2] 曾云[1] 

机构地区：[1]湖南大学物理与微电子科学学院,湖南长沙410082 [2]中国科学院微电子研究所,北京100029

出　　处：《微电子学与计算机》2010年第11期46-50,共5页Microelectronics & Computer

基　　金：国家"八六三"计划项目(2007AA01Z2a8)

摘　　要：设计了一种应用于大规模无线传感网RF前端芯片的数字控制CMOS可编程增益放大器(PGA).该放大器采用五级增益单元级联结构,每个增益单元采用了固定增益放大器加可编程衰减器的结构,且具有直流漂移抑制功能.增益的变化通过两步完成,R-2R梯形电阻网络实现6dB增益步进,而0.75dB步进由串行电阻网络来完成.后仿真结果表明,放大器的动态范围为10～88dB,0.75dB步进,增益精确度为0.7mdB,最大增益下输出三阶交调点为16.1dBm.可编程增益放大器采用SMIC0.18μm1P6M混合信号CMOS工艺实现,核面积约为0.08mm2.A digital-controlled programmable gain amplifier （PGA） is designed for the RF front-end circuits of large scale wireless sensor network. Five serial stages are employed in the PGA and Each stage is composed of a programmable attenuator followed by a fixed-gain amplifier that has the function of DC-offset rejection. Variable gain is achieved via two steps. The 6dB gain steps are implemented using the R-2R ladder network and the 0.75dB gain step is implemented by a series ladder linear attenuator. Simulation results show that the PGA provide a 78dB gain control range with 0.75dB step and the overall gain accuracy was 0.7mdB. The OIP3 is 16.1dBm. The PGA is fabricated in 0.18μm 1P6M CMOS process and occupies 0.08mm^2 active area.

关 键 词：PGA 可编程衰减器 直流抑制 DB线性 

分 类 号：TN4[电子电信—微电子学与固体电子学]