【摘要】：隨著半導(dǎo)體材料以及微波通信技術(shù)的蓬勃發(fā)展,原本應(yīng)用于雷達(dá)、軍事寬帶通信領(lǐng)域的微波電路在手機基站、汽車?yán)走_(dá)等民用領(lǐng)域也大放異彩。工作在該頻段的電子設(shè)備,常借助倍頻器將較低頻率的本振信號倍頻到需要的微波毫米波頻段,這樣既能降低本振頻率又能擴(kuò)展帶寬。而倍頻器MMIC,不僅有倍頻器的一般特點,還有單片微波集成電路尺寸小、一致性好等優(yōu)勢,所以它在電子設(shè)備上較分立的板級倍頻電路得到了更廣泛的應(yīng)用。無源倍頻器不需要直流供電,使用簡單,廣泛運用于微波收發(fā)前端。本文將圍繞寬帶無源倍頻器進(jìn)行研究。選擇合適的電路拓?fù)浣Y(jié)構(gòu)是設(shè)計倍頻器的關(guān)鍵。論文對3種無源電路拓?fù)浣Y(jié)構(gòu)進(jìn)行倍頻原理推導(dǎo)。從項目需求出發(fā),引入了雙螺旋巴倫,討論研究了影響其性能的主要因素,并據(jù)此設(shè)計出2款實用的巴倫電路。然后借助巴倫搭建了3款與前邊討論相對應(yīng)的無源倍頻電路,利用諧波平衡法進(jìn)行了整體優(yōu)化。結(jié)合本文的指標(biāo)與它們的仿真結(jié)果進(jìn)行對比,總結(jié)各電路的優(yōu)勢和不足之后,最終選擇了仿真結(jié)果較好的雙平衡倍頻電路作為本次研究設(shè)計的重點。該倍頻器采用四只相同的肖特基勢壘二極管組成核心電路,輸入輸出則借助巴倫結(jié)構(gòu)完成了寬帶匹配和諧波抑制功能,最終輸出所需要的二次諧波信號。論文還研究了影響倍頻輸出功率平坦度的一些因素,并給出了解決方案。采用成熟穩(wěn)定的穩(wěn)懋0.15μm GaAs PHEMT工藝,成功設(shè)計出一款不同于原HMC204的電路結(jié)構(gòu),且具有優(yōu)異變頻增益以及良好的倍頻輸出功率平坦度的寬帶無源二倍頻器是該倍頻器的特色。該二倍頻器在片實測顯示:當(dāng)輸入功率為15dBm,在8~16GHz整個倍頻段內(nèi),輸出功率均大于1dBm,變頻損耗小于14dB。對基波和各次諧波的隔離度均大于38dBc,芯片尺寸為1.3×1.3 mm~2。該二倍頻器MMIC達(dá)到了預(yù)期目標(biāo),起到了原位替換HMC204的作用,將用于軍用電子設(shè)備上。該款倍頻器MMIC的研制拓寬了用戶的選擇,降低了采購成本,也為相關(guān)倍頻器的研究起到了技術(shù)借鑒作用。
[Abstract]:With the rapid development of semiconductor materials and microwave communication technology, microwave circuits which are supposed to be used in the field of radar, military broadband communication are also very popular in the field of mobile phone base station, automobile radar and other civilian fields. Electronic equipment working in this frequency band often uses frequency multiplier to double the local vibration signal of lower frequency to the microwave millimeter wave frequency band which is needed so that the local frequency can be reduced and the bandwidth can be extended. The frequency multiplier MMIC, not only has the general characteristics of the frequency multiplier, but also has the advantages of small size and good consistency of the single chip microwave integrated circuit, so it has been more widely used in electronic equipment than the discrete board-level frequency doubling circuit. Passive frequency multiplier does not need DC power supply. It is simple to use and is widely used in microwave transceiver front end. This paper will focus on broadband passive frequency multiplier. The selection of appropriate circuit topology is the key to the design of frequency multiplier. In this paper, the frequency doubling principle of three kinds of passive circuit topology is deduced. According to the requirements of the project, the double helix Barron is introduced, and the main factors affecting its performance are discussed and studied, and two practical Balun circuits are designed according to the requirements of the project. Then three passive frequency doubling circuits corresponding to the previous discussion are built with the help of Barron and the harmonic balance method is used to optimize the whole circuit. After summarizing the advantages and disadvantages of each circuit, the double-balanced frequency doubling circuit with better simulation results is selected as the focus of this research and design based on the comparison between the results of this paper and their simulation results. The frequency multiplier uses four identical Schottky barrier diodes to form the core circuit, and the input and output complete the broadband matching and harmonic suppression functions with the help of the Baron structure, and finally output the second harmonic signal required. Some factors affecting the flatness of the output power of frequency doubling are also studied, and the solutions are given. In this paper, a stable 0.15um GaAs PHEMT process is used to design a broadband passive frequency multiplier which is different from the original HMC204 and has excellent frequency conversion gain and good power flatness of frequency doubling output is the characteristic of this frequency multiplier. The results show that when the input power is 15dBm, the output power is more than 1dBm and the loss of frequency conversion is less than 14dB in the whole frequency band of 8~16GHz. The isolation of fundamental and harmonic waves is greater than 38dBc, and the chip size is 1.3 脳 1.3 mm~2.. The frequency doubler MMIC has achieved the expected goal and has the function of replacing HMC204 in-situ. It will be used in military electronic equipment. The development of the frequency multiplier MMIC broadens the user's choice, reduces the purchase cost, and also plays a technical role in the research of the related frequency multiplier.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN771

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相關(guān)期刊論文 前1條

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本文編號：2460395