10.4~28 GHz的超宽带6位数字衰减器设计  

Design of a 10.4-28 GHz Ultra-Wideband Six-bit Digital Attenuator

作　　者：郝欧亚 刘章发[1] HAO Ouya;LIU Zhangfa(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,P.R.China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《微电子学》2024年第1期85-91,共7页Microelectronics

摘　　要：基于中芯国际40 nm CMOS工艺设计并实现了一种超宽带6位数字衰减器,其工作频率为10.4~28 GHz。该衰减器采用内嵌式开关型结构,6位衰减单元的设计采用T型、桥T型和π型三种拓扑结构。该6位衰减器可以实现0.5 dB的衰减步进,31.5 dB的动态衰减范围。采用大衰减量幅度补偿电路和高匹配特性的衰减位级联结构,衰减器在10.4~28 GHz的频段范围内具有平坦的64态衰减量,衰减器的整体前仿真插入损耗为1.73~2.08 dB,后仿真插入损耗为4.32~6.31 dB,64态的输入输出回波损耗均小于-10 dB。An ultra-wideband six-bit digital attenuator operating at frequencies ranging from 10.4 GHz to 28 GHz was designed and implemented in SMIC 40 nm CMOS process.The attenuator utilized an embedded switching-type structure,with the six-bit attenuation unit designed in three different topologies,T-type,bridge-T-type,andπ-type.This six-bit attenuator achieves a step attenuation of 0.5 dB and a dynamic attenuation range of 31.5 dB.By incorporating a large attenuation amplitude compensation circuit and a cascaded structure of attenuation bits with excellent matching characteristics,the attenuator achieves a flat 64-state attenuation across the frequency range of 10.4 GHz to 28 GHz.The pre-simulation insertion loss of the attenuator ranges from 1.73 dB to 2.08 dB,while the post-simulation insertion loss ranges from 4.32 dB to 6.31 dB.Furthermore,the input and output return losses of all 64-states are less than-10 dB.

关 键 词：衰减器 CMOS工艺 超宽带 内嵌式开关 插入损耗 

分 类 号：TN432[电子电信—微电子学与固体电子学]