【作者】 文星；

【导师】 孙玲玲；

【作者基本信息】 杭州电子科技大学 ， 电路与系统， 2010， 硕士

【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、稳定性好、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,MMIC衰减器在宽带通信、微波无线电通信、雷达以及空间通信等电子设备中有着广泛的应用。本论文主要介绍了超宽带五位MMIC数字衰减器的原理电路设计、仿真优化、版图设计、流片的在片测试及测试结果分析。文章首先介绍了MMIC技术特点以及应用,其次陈述了MMIC衰减器的发展概况和研究意义,并对工艺特点以及几种基本衰减结构进行了讨论,再次具体介绍了此超宽带衰减器的设计过程:根据具体要求,选用最优的结构,采用MOMENTUM联合仿真优化法,分别设计出1dB、2dB、4dB、8dB、16dB衰减位,再通过级联整体仿真优化设计出了所需衰减器。由于所设计的电路还进行了流片验证并使用探针台做了在片测试,因而最后还对测试结果进行了全面分析,讨论了所做工作的意义与不足。该五位MMIC数字衰减器的工作频段为5-38GHz,就作者所知,是国内见报道的同类产品中带宽最宽的。设计软件使用了ADS2006A系统,采用0.25um pHEMT工艺线实现。经流片测试,所设计衰减器性能良好,在工作频带内的衰减范围为31dB,衰减步进为1dB,具有较精确的衰减步进误差(1.0±0.4dB),小的插入损耗(<7dB)以及优良的回波损耗(>12dB),芯片尺寸仅为2.4mm×1.2mm×0.1mm,可以应用于军事电子对抗及民用通信中。更多还原

【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, attenuators are widely used in broadband communications, microwave radio communications, military radar, space communications and other electronic equipments.This paper mainly introduces the circuit design, layout design, testing results and analysis of an ultra broadband MMIC 5-bit digital attenuator.Firstly, this paper describes the characteristics of MMIC technology and application. Secondly, making a presentation of the development of MMIC attenuator and its significance, then discussed several basic structures for attenuator. Subsequently, specifically this paper introduces the design of this ultra-wideband attenuator: According to the specific requirements, we choose the best structure, using MOMENTUM co-simulation for optimization to design 1dB, 2dB, 4dB, 8dB, 16dB attenuation bit, and then achieve the desired attenuator by running simulation and optimization of the whole cascade circuit. Since the circuit has been taped-out and testing on board, finally we make a comprehensive analysis of the results and a discussion of the significance and shortcomings of our work.In the design, Advanced Design System 2006(ADS2006) is used as the EDA tool. Finally, the 5-bit digital attenuator was taped out with 0.25um pHEMT process. It has a good performance and operates at 5GHz-38GHz, has 31 dB dynamic range stepped by 1 dB; reference insertion loss:<7 dB; attenuation increments are 1.0±0.4 dB; input and output return loss:>12 dB. The chip size is only 2.4mm×1.2mm×0.1mm. As far as I know, the bandwidth of the attenuator is the broadest one yet reported in domestic literatures. It can be used for military electronic counter measures and civilian communications.更多还原