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.
出处
《微电子学与计算机》
CSCD
北大核心
2010年第11期46-50,共5页
Microelectronics & Computer
基金
国家"八六三"计划项目(2007AA01Z2a8)
关键词
PGA
可编程衰减器
直流抑制
DB线性
programmable gain amplifier
programmable attenuator
DC-offset cancellation
linear-in-dB
