一种利用衰减器实现的超宽带可变增益放大器  

A Variable Gain Amplifier for UWB Systems Using Active Variable Attenuator

作　　者：邢光辉[1] 张万荣 谢红云[1] 丁春宝[1] 郭振杰[1] 路志义[1] 张瑜洁[1] 张卿远[1] 

机构地区：[1]北京工业大学电子信息与控制工程学院,北京100124

出　　处：《微电子学》2013年第4期468-471,479,共5页Microelectronics

基　　金：模拟集成电路重点实验室基金资助项目(51439010804QT0101);北京市自然科学基金资助项目(4082007);国家自然科学基金资助项目(60776051;61006044;61006059);北京市教委科技发展计划项目(KM200710005015;KM200910005001);北京市人才强教深化计划-服务北京创新人才培养项目(0020005412A001);北京市优秀跨世纪人才基金项目(67002013200301)

摘　　要：提出了一种基于有源可调衰减器的超宽带可变增益放大器,以有源可调衰减器作为可变增益放大器的核心,并与高增益放大器级联,在3.1～10.6GHz超宽频带内实现了宽动态增益调节范围。基于Jazz 0.35μm SiGe HBT工艺,完成了超宽带可变增益放大器的设计,利用安捷伦公司的ADS仿真软件进行仿真验证。结果表明,在3.1～10.6GHz的超宽频带内,当电压在0.7～2.0V的范围内变化时,该放大器的动态增益变化范围大于60dB,3dB带宽大于7GHz,在整个电压变化范围内,S11和S22均低于-10dB,在最大增益处,噪声系数小于5dB。A variable gain amplifier （VGA） with wide dynamic gain range for ultra-wide band （UWB） systems was designed based on active variable attenuator, which, as core of the VGA, was connected to a high gain amplifier. The VGA achieved wide dynamic gain range in the frequency band from 3. 1 GHz to 10. 6 GHz. The circuit was designed based on Jazz＇s 0. 35 μ~m SiGe HBT process, and simulated with ADS design kit of Agilent. Results indicated that, as voltage changed from 0. 7 V to 2. 0 V in the frequency band from 3. 1 GHz to 10. 6 GHz, the VGA had a dynamic gain range over 60 dB, a 3-dB bandwidth above 7 GHz, an Sn and Szz lower than -10 dB in full voltage range, and an NF below 5 dB for maximum gain.

关 键 词：超宽带 可变增益放大器 有源可调衰减器 

分 类 号：TN721.1[电子电信—电路与系统]