一种X波段低附加相位的6位单片数控衰减器  

An X-Band Low Insertion Phase 6-bit Monolithic Digital Controlled Attenuator

作　　者：刘凡[1,2] 熊翼通[2] 刘志伟 LIU Fan;XIONG Yitong;LIU Zhiwei(University of Electronic Science and Technology of China, Chengdu 610054, P. R. China;Sichuan Institute of Solid-State Circuits, China Electronics Technology Group Corp. , Chongqing 400060, P. R. China)

机构地区：[1]电子科技大学,成都610054 [2]中国电子科技集团公司第二十四研究所,重庆400060

出　　处：《微电子学》2018年第2期232-236,共5页Microelectronics

摘　　要：提出了一种X波段低附加相位的6位单片数控衰减器。采用一种改进型开关T型衰减网络,实现了2dB与4dB的衰减位。网络在整个带宽内具有良好的附加相位特性。其他各衰减位采用了基于传输线的相位补偿结构。该6位单片数控衰减器基于0.25μm GaAs工艺进行流片与验证,芯片面积为(2.2×1.4)mm^2。测试结果表明,在整个带宽内,该数控衰减器的插损小于4.1dB,输入输出回波损耗小于-10.7dB,RMS幅度误差小于0.26dB,RMS相位误差小于2.4°。An X-band low insertion phase 6-bit digital controlled attenuator MMIC was presented.An improved switched T-type attenuation network was employed to build the 2 dB and 4 dB attenuation bits.The proposed attenuation network topology could effectively reduce the insertion phase within the whole band concerned.And transmission line based phase compensation structure was used in other attenuation units.The proposed 6-bit attenuator was fabricated in a 0.25μm GaAs technology.The total chip size was（2.2 × 1.4）mm^2.The results showed that the insertion loss was less than 4.1 dB,the input/output return loss was less than -10.7 dB,the RMS amplitude error was 0.26 dB,and the RMS phase error was 2.4° within the whole band concerned.

关 键 词：数控衰减器 低附加相位 微波IC 

分 类 号：TN402[电子电信—微电子学与固体电子学] TN304.23