摘要高精度毫米波单片集成电路（MMIC）数字衰减器被广泛应用于相控阵雷达等电子设备中。高精度MMIC数字衰减器实现对微波信号进行精确的步进衰减，其性能优劣对于电子设备的整体性能优劣有着很大的影响。
本论文对高精度MMIC数字衰减器展开了研究与设计。首先对数字衰减器的几个主要技术指标及常用单位衰减拓扑结构的特点进行了分析和比较；重点介绍了本文对MMIC控制器件PHEMT开关的建模，分析和介绍了GaAs PHEMT/GaN PHEMT器件的工作原理，提出了适合电路性能最佳化的动态比例缩放模型。
借助于Agilent公司的Advanced Design System 2008(ADS2008)，根据工作频率范围、衰减精度、衰减附加相移、参考态插入损耗和驻波比等主要性能指标来设计：1、选择合理的单位衰减拓扑结构；2、分别对各个衰减位进行原理图优化仿真；3、多个衰减位原理图级联仿真优化；优化过程中，特别采用了性能冗余优化策略，保证了产品各项性能优异和高成品率。
本文结合某实际工程需求，对毫米波高精度MMIC数字衰减器设计与制作进行了研究和探索，摸索出毫米波多位数字衰减器的设计方法和流程，完成了Ka波段高精度MMIC751位数字衰减器的设计，设计的性能优异。这些成果对毫米波高精度MMIC数字衰减器的研制均有一定参考价值。8667
关键词 毫米波波单片集成电路(MMIC)，高电子迁移率晶体管 (PHEMT)，超宽带，低插入相移，数字衰减器
毕业设计说明书（论文）外文摘要
Title millimeter-wave monolithic digital integrated attenuator
Abstract
High-precision MMIC digital attenuators are widely used in electronic equipments as Phased Array Radar. The high-precision MMIC digital attenuators used to preside control of the magnitude of microwave signal. The performance of the high-precision MMIC digital attenuator has a direct impact on electronic equipments.
In this paper, a Ka-band high-precision MMIC digital attenuator is researched and designed. First we described the main technical indicators of the digital attenuator and contrasted the principle of several typical topologies for attenuators. Then we carefully analyzed the model of the MMIC components and detailed analyzed of the principle and scaling models of the GaAs PHEMT/GaN PHEMT.
In this design, Advanced Design System 2008(ADS2008) is used as the EDA tool. And the 0.15µm GaAs PHEMT process of the WIN Inc is chosen to process the MMIC chip. High performance and yield of the product is obtained by making accurate models, choosing appropriate configuration, optimizing schematic and layout and especially using performance redundancy optimization strategy in the optimization process.
Keywords MMIC, digital attenuator, device model, GaN, layout simulation
目 录
1. 绪论
1.1 MMIC技术发展概况4
1.2 MMIC的优点和不足6
1.3 MMIC的应用7
1.4 MMIC数字衰减器的研究意义及发展概况8
1.5本文主要研究内容.9
2. 数字衰减器的基本理论、
2.1数字衰减器的主要技术指标.10
2.2开关式衰减结构..12
2.3几种衰减结构的分析和比较
2.3.1T型衰减结构.13
2.3.2π型衰减结构15
2.3.3桥T型衰减结构.17
2.4 MMIC751位数字衰减器的设计 毫米波单片集成数字衰减器的研究:http://www.751com.cn/tongxin/lunwen_7091.html