W波段放大檢波電路研究
[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.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN763.1
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