毕业设计说明书（论文）中文摘要随着科技的进步，通信系统不断更新换代，通信产品也随之不断的向小型化、低功耗、高可靠性等方向发展，而单片微波集成电路(MMIC)具有小型紧凑、抗干扰能力强、产品性能一致性好和批量生产成本低等优势，因而在通信市场中占据越来越重要的地位。作为系统的重要组成部分，微波单片集成电路（MMIC）数字衰减器在相控阵天线，宽带电子对抗，射频放大器，自动增益控制接收/发射系统等电子设备中有着广泛的应用。64771

    本论文主要介绍了31-35GHz六位MMIC数字衰减器的原理、电路的设计、仿真优化。本文首先对MMIC技术、发展历程和数字衰减器进行了简单的介绍，

详细分析了MMIC元器件模型，深入探讨了各位数字衰减器的电路拓扑结构;其次根据六个衰减位不同的衰减量要求计算出拓扑结构中的电阻初值，并针对附加相移、衰减精确度、插入损耗和输入输出驻波比等指标要求一同进行优化，完成六个衰减位的单独设计;最后将六位数字衰减器级联进行总体优化。

    本文所采用的设计软件是Advanced Design System 2008(ADS2008)软件，根据频段，衰减大小，衰减精度，附加相移等主要参数指标，对每一位的衰减器选择合适的拓扑模型进行优化仿真。

毕业论文关键词  微波单片集成电路，数字衰减器，控制电路模型

毕业设计说明书（论文）外文摘要

Title      The IC Research on Digital Attenuator    

Abstract

With the development of communication technology，communication systems are   constantly upgrading. Communication products also are developing at many directions such as miniaturization、low-power and reliability. Due to its small size, good stability, capability, consistency and cheap in mass yield, Monolithic Microwave Integrated Circuit (MMIC) is becoming more and more important in the communication market. As the key component of system,Monolithic microwave integrate circuit digital attenuator is widely used in the field of phase array antenna,  broadband electronic countermeasures，RF amplifier, AGC T/R system and so on.

This paper mainly introduced the circuit design，layout design and of this 31-35GHz MMIC 6-bit digital attenuator with low phase shift.There is a brief introduction of MMIC technology and developing course as well as digital attenuator at the beginning of this paper. And then we analyze the model of the MMIC components,and described the basic theories of digital attenuators and contrasted the principle of several typical topologies for attenuators.After the appropriate topology is selected for each bit,the initial values of  the ideal resistors are calculated for different attenuation based on different attenuation requirements of different attenuators,proper optimized functions are chosen for all optimized goals such as Insertion phase shift， attenuation accuracy， insertion loss and input/output VSWR.While each bit has achieved their best states,they can be cascaded for simulation.At last,the layout was designed and optimized combined with the Processing technology to achieve the comprehensive best result.

In this design,Advanced Design System2008(ADS2008) is used as the EDA tool.based on frequency, attenuate, accuracy of attenuate, phase shifter and other characters, choose the right topology for every inpidual attenuator to optimize and simulate.

Keywords   MMIC, digital attenuator, model of control circuit

目   录

1 引言 6

1.1 MMIC概述 6

1.2数字衰减器的发展以及研究意义 7