【摘要】：混頻器是微波電路與系統(tǒng)中的關(guān)鍵部件。隨著通信與電子系統(tǒng)寬頻帶、小型化和集成化的快速發(fā)展,性能良好的微波集成寬帶混頻器成為當前的研究熱點之一。本文基于GaAs工藝,通過理論分析、參數(shù)化建模、聯(lián)合仿真優(yōu)化,迭代改進電路結(jié)構(gòu),設(shè)計并實現(xiàn)了能夠覆蓋2-18 GHz的寬帶無源雙平衡混頻器單片集成電路。論文的主要工作如下：1)基于Win的GaAs PD25工藝,采用全波電磁仿真,針對以螺旋線變壓器為代表的無源器件建立了尺寸可變的參數(shù)化等效電路模型,以提高設(shè)計效率。2)利用奇偶模分析法對理想巴倫需要滿足的幅度平衡和相位平衡條件進行了詳細的分析,得出了相關(guān)的限制條件,用于巴倫的創(chuàng)新設(shè)計。3)設(shè)計了一款寬帶Marchand巴倫芯片并總結(jié)了其設(shè)計流程。根據(jù)奇偶模分析得到的限制條件,通過在巴倫的中央加一段開路支節(jié)提高其性能。所設(shè)計的寬帶巴倫在4--24 GHz內(nèi)幅度平衡可以保持在1.5dB以內(nèi),在2-22 GHz內(nèi)相位平衡可以保持在10度以內(nèi)。仿真與測試結(jié)果基本一致,驗證了相關(guān)結(jié)論。4)總結(jié)了無源混頻器的設(shè)計流程,設(shè)計了三款寬帶無源雙平衡混頻器芯片。在傳統(tǒng)寬帶無源雙平衡混頻器結(jié)構(gòu)的基礎(chǔ)上,用雙混頻環(huán)結(jié)構(gòu)拓展了混頻器的帶寬,用新型中頻提取結(jié)構(gòu)改善了變頻損耗的帶內(nèi)波動和射頻到中頻端的隔離度。混頻器帶寬為2-18 GHz,變頻損耗小于10dB且?guī)?nèi)波動小,本振到中頻的隔離度在15dB以上,射頻到中頻端的隔離度在15dB以上,本振到射頻端的隔離度在25dB以上。測試結(jié)果與目前國際上先進混頻器廠商同類產(chǎn)品的水平基本一致。
[Abstract]:Mixer is a key component in microwave circuit and system. With the rapid development of broadband, miniaturization and integration in communication and electronic systems, microwave integrated broadband mixers with good performance have become one of the research hotspots. Based on the GaAs process, through theoretical analysis, parametric modeling, joint simulation optimization, iterative improvement of circuit structure, a wideband passive dual-balanced mixer monolithic integrated circuit covering 2-18 GHz is designed and implemented. The main work of this paper is as follows: (1) based on the GaAs PD25 technology of Win, a parameterized equivalent circuit model with variable size for the passive device represented by helix transformer is established by using full wave electromagnetic simulation. In order to improve the design efficiency, the amplitude balance and phase balance conditions required by ideal Barron are analyzed in detail by using parity mode analysis, and the relative limiting conditions are obtained. A broadband Marchand Barron chip is designed and its design flow is summarized. According to the limiting conditions obtained by the analysis of even and odd modes, the performance of Barron is improved by adding a section of open branch in the center. The amplitude balance of the designed broadband Barron can be kept within 1.5dB within 4-24 GHz, and the phase balance within 2-22 GHz can be kept within 10 degrees. The simulation results are in good agreement with the test results, which verify the relevant conclusion .4) the design process of the passive mixer is summarized, and three broadband passive dual-balanced mixer chips are designed. Based on the traditional wideband passive dual balanced mixer, the bandwidth of the mixer is extended by using the dual mixing loop structure, and the in-band fluctuation of the frequency conversion loss and the isolation from the RF to the intermediate frequency end are improved by a new intermediate frequency extraction structure. The frequency conversion loss of 2-18 GHz, is smaller than that of 10dB, and the in-band fluctuation is small. The isolation from local oscillator to intermediate frequency is above 15dB, from RF to intermediate frequency is above 15dB, and from local oscillator to radio frequency is above 25dB. The test results are basically consistent with the level of similar products of the international advanced mixer manufacturers.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN773

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本文編號：2218206