W波段放大检波电路研究

发布时间：2018-12-21 08:15

【摘要】：辐射计可用于遥感、安检、制导等领域中,在军事、环境科学上都有重要的作用。毫米波辐射计接收前端电路现在主要采用的是直接检波式结构。毫米波放大检波电路作为毫米波辐射计的关键部件,对系统性能指标起决定性作用。国外对W波段技术研究起步早,技术比较成熟,技术水平处于优势地位;国内W波段技术相对起步较晚,正处于追赶国外技术的阶段。本文采用混合集成电路的形式对W波段放大检波电路进行了设计。本文首先介绍了毫米波基本特点及应用和辐射计前端电路,并简要的阐述国内外发展动态,同时给出了课题的研究意义和具体指标。然后,通过课题的给出的指标,给出了电路的整体设计方案以及方案中各器件的指标预估。然后,先进行了对低噪声放大器基本原理与指标的介绍,根据预估的指标选取合适的低噪声放大器单片;然后对视频放大器原理进行了介绍和选择合适的运算放大器,并进行了测试。然后,先对毫米波波导-探针-微带过渡进行了介绍,并进了设计和加工,测试结果显示设计的过渡基本满足要求;其次对检波器的基本理论和主要技术指标进行了介绍,设计了三种不同的方案来实现W频段检波器:方案一检波二极管在微带线上实现了微带检波器;方案二检波二极管在共面波导上实现共面波导检波器;方案三采用MMIC单片结构实现单片检波器。通过最终的测试,选择达到满足指标的微带检波器应用于整体的结构中。然后,对整体电路指标进行了可行性分析,设计了W波段放大检波电路的腔体、微带电路和背面稳压块、视频放大器等低频电路,腔体尺寸和外观满足指标要求,随后给出了调试和测试过程,并得到了最终的测试结果。最后,整体电路设计过程进行总结,并根据测试结果进行了分析,并给出了电路改进措施。
[Abstract]:Radiometers can be used in remote sensing, security inspection, guidance and other fields, in military, environmental science plays an important role. Millimeter-wave radiometer receiving front-end circuit mainly adopts the structure of direct detection. As a key component of millimeter wave radiometer, millimeter wave amplification and detection circuit plays a decisive role in system performance. The research on W-band technology in foreign countries started early, the technology is relatively mature, and the technology level is in the dominant position, and the domestic W-band technology is relatively late and is in the stage of catching up with foreign technology. In this paper, the W-band amplification and detection circuit is designed in the form of hybrid integrated circuit. In this paper, the basic characteristics and application of millimeter wave and the front-end circuit of radiometer are introduced, and the development of millimeter-wave at home and abroad is briefly described. At the same time, the research significance and specific index of the subject are given. Then, the overall design scheme of the circuit and the index estimation of each device in the scheme are given through the index given in the subject. Then, the basic principle and index of LNA are introduced, and the suitable LNA single chip is selected according to the predictor. Then the principle of video amplifier is introduced and the appropriate operational amplifier is selected and tested. Then, the millimeter-wave waveguide-probe microstrip transition is introduced, and the design and fabrication are carried out. The test results show that the transition of the design basically meets the requirements. Secondly, the basic theory and main technical specifications of the geophone are introduced, and three different schemes are designed to realize the W-band geophone: scheme one, the detector diode realizes the microstrip geophone on the microstrip line; The second scheme realizes the coplanar waveguide detector on the coplanar waveguide, and the third scheme uses MMIC monolithic structure to realize the monolithic detector. Through the final test, the microstrip detector which meets the target is selected and applied to the whole structure. Then, the feasibility of the whole circuit index is analyzed, and the cavity, microstrip circuit and low frequency circuit such as the back voltage stabilizer and video amplifier are designed. The size and appearance of the cavity meet the requirements. Then the debugging and testing process are given, and the final test results are obtained. Finally, the whole circuit design process is summarized and analyzed according to the test results, and the circuit improvement measures are given.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN763.1

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