K波段集成下变频器的设计

【作者】 汪莉；

【导师】 恽小华；

【作者基本信息】 南京理工大学 ， 电磁场与微波技术， 2008， 硕士

【摘要】 下变频器是微波集成电路接收系统中必不可少的部件。不论是微波通信、雷达、遥控、遥感、还是侦察与电子对抗,以及许多微波测量系统,都必须把微波信号用下变频器降到中低频来进行处理。至今各种微波系统中几乎都采用了集成电路下变频器,主要是因为集成式下变频器体积小,性能稳定可靠,设计技术成熟,而且结构灵活多样,可以适合各种特殊应用。国外的一些主要军火公司很早就致力于以GaAs技术为基础的MMIC的发展,而且已经取得了相当的成绩,并使之推广到下变频的应用中,国内在这方面也进行了许多卓有成效的工作,但鉴于微波领域的许多研制涉及新理论和制作工艺问题,以及我国目前GaAs技术与国际水平尚有一段不小的差距,电路制作和工艺也有待完善,短期内要实现微波下变频电路的单片集成还不现实。为此,通过混合集成技术实现下变频就成为一种切实可行的方案。本论文首先对下变频器进行了详细介绍,分析了多种下变频器结构,结合各种结构的优缺点,在此基础上选择合适的结构,利用低成本、高可靠性的微波单片集成电路(MMIC)来实现K波段集成下变频器。根据指标要求,确定具体实现方案,设计无源电路,并合理选择各单元部件,完成对下变频器的设计。更多还原

【Abstract】 Downconverter is an important part of microwave integrated receiving systems. No matter the use is of microwave communication, radar, distant control and sensor, and detecting and electronic confrontation, and many other microwave measuring systems, we have to transfer the microwave signal to intermediate frequency using a downconverter.Currently, almost all kinds of microwave systems adapting integrated downconverter, mainly because integrated downconverter occupies the following advantages: less volume, reliable function, mature designing technology, flexible structure, and fitting varied special application. Main oversea chip-supply companies have achieved great success due to their earnest effort with an early beginning on research of GaAs-based MMIC technology. And now these companies have applied this technology to the downconverter. Research institutions and related companies in China also have done much celebrated work. But in microwave field researching staffs have to pay special attention to new theories and manufacturing technics. Due to China’s present GaAs technology manufacturing level, there is still a long way to go, especially in the aspects of circuit making and technics. So it is not practical for Chinese researchers achieving monolithic integrated microwave down-converter in a short period of time. Ultimately, the schedule of mixed integrated microwave downconverter comes to the choice.This paper describes the downconverter specifically in the beginning. In this part, the structures of downconverter are analyzed. Considering the advantages of several kinds of structures, the design finally chooses the proper structure. Low-cost, high-reliability MMIC is preferable. According to the request of the user, the ultimate design schedule is determined, including the passive circuit, and active devices. Finally the design completes.更多还原