A 4th-order reconfigurable analog baseband filter for software-defined radio applications  

作　　者：王伟威 常学贵 王肖 韩科锋 谈熙 闫娜 闵昊 

机构地区：[1]State Key Laboratory of ASIC & System,Fudan University

出　　处：《Journal of Semiconductors》2011年第4期137-144,共8页半导体学报（英文版）

基　　金：Project supported by the Important National Science and Technology Specific Projects of China(No2009ZX01031-003-002);the National High Technology Research and Development Program of China(No2009AA011605);the National Natural Science Foundation of China(No61076028)

摘　　要：This paper presents a 4th-order reconfigurable analog baseband filter for software-defined radios.The design exploits an active-RC low pass filter（LPF） structure with digital assistant,which is flexible for tunability of filter characteristics,such as cut-off frequency,selectivity,type,noise,gain and power.A novel reconfigurable operational amplifier is proposed to realize the optimization of noise and scalability of power dissipation.The chip was fabricated in an SMIC 0.13μm CMOS process.The main filter and frequency calibration circuit occupy 1.8×0.8 mm;and 0.48×0.25 mm;areas,respectively.The measurement results indicate that the filter provides Butterworth and Chebyshev responses with a wide frequency tuning range from 280 kHz to 15 MHz and a gain range from 0 to 18 dB.An IIP3 of 29 dBm is achieved under a 1.2 V power supply.The input inferred noise density varies from 41 to 133 nV/（Hz）;according to a given standard,and the power consumptions are 5.46 mW for low band（from 280 kHz to 3 MHz） and 8.74 mW for high band（from 3 to 15 MHz） mode.This paper presents a 4th-order reconfigurable analog baseband filter for software-defined radios.The design exploits an active-RC low pass filter（LPF） structure with digital assistant,which is flexible for tunability of filter characteristics,such as cut-off frequency,selectivity,type,noise,gain and power.A novel reconfigurable operational amplifier is proposed to realize the optimization of noise and scalability of power dissipation.The chip was fabricated in an SMIC 0.13μm CMOS process.The main filter and frequency calibration circuit occupy 1.8×0.8 mm2 and 0.48×0.25 mm2 areas,respectively.The measurement results indicate that the filter provides Butterworth and Chebyshev responses with a wide frequency tuning range from 280 kHz to 15 MHz and a gain range from 0 to 18 dB.An IIP3 of 29 dBm is achieved under a 1.2 V power supply.The input inferred noise density varies from 41 to 133 nV/（Hz）1/2 according to a given standard,and the power consumptions are 5.46 mW for low band（from 280 kHz to 3 MHz） and 8.74 mW for high band（from 3 to 15 MHz） mode.

关 键 词：RECONFIGURABLE software-defined radio baseband filter digital assistant high linearity 

分 类 号：TN92[电子电信—通信与信息系统] TQ051.85[电子电信—信息与通信工程]