集成小型化混頻器的研究
發(fā)布時間：2019-03-08 20:29
【摘要】：為了適應(yīng)具有較寬頻率帶寬比的信號,在高頻接收機前面促進上變頻的發(fā)生,同時提高接收機靈敏度,設(shè)計高性能無源混頻器可以使原始設(shè)備廠商優(yōu)化接收機設(shè)計,這樣的混頻器在軍方應(yīng)用和民用場合都很有用。最原始的單端和單平衡的無源二極管混頻器由于較差的端口隔離度和中頻端口輸出頻率低等缺點逐漸受到摒棄。隨后出現(xiàn)的平衡混頻器由于較寬的本振和射頻工作帶寬、較高的端口間隔離度、較大的輸入三階交調(diào)截點IP3等廣泛受到研發(fā)工程師的青睞,但其存在插入損耗通常為-6 dB甚至更大和本振功率10 dBm左右的缺點。有源混頻器由于電路結(jié)構(gòu)比較復(fù)雜,特別是應(yīng)用于微波頻段時,用微帶線制作的話尺寸會很大,不利于電路的集成,與器件小型化發(fā)展趨勢背道而馳。故微波通信中無源器件的小型化研究工作仍存在著未攻克的難關(guān)。本文首先從小型化混頻器研究背景及意義開始,依次介紹其歷史、國內(nèi)外研究現(xiàn)狀及發(fā)展態(tài)勢;接著詳細(xì)解釋了混頻器工作原理,分析混頻器各項性能參數(shù)概念及其計算方法;然后深入研究平面巴倫理論,對平面巴倫進行仿真驗證及改進分析,在此基礎(chǔ)上引入多層Marchand巴倫結(jié)構(gòu)以實現(xiàn)小型化,并仿真驗證性能指標(biāo)。本文研制的混頻器在綜合對比不同混頻器結(jié)構(gòu)基礎(chǔ)上,選擇雙平衡混頻器電路結(jié)構(gòu),采用Avago公司的HSMS2827芯片作為環(huán)形二極管堆,利用SPICE參數(shù)模型在ADS軟件中對射頻、本振回路的二極管對建模分析,仿真阻抗頻率特性,為巴倫阻抗匹配提供初值。分析與研究多層Marchand巴倫各項指標(biāo),基于LTCC工藝在三維高頻電磁仿真軟件HFSS中建模和改進,通過模型改進對比,選擇級聯(lián)巴倫結(jié)構(gòu)進行混頻器巴倫設(shè)計。對射頻、中頻、本振巴倫進行優(yōu)化仿真,導(dǎo)出SNP文件后聯(lián)合二極管模型進行級聯(lián)仿真,保證小型化寬帶混頻器的性能。本文詳細(xì)地介紹了雙平衡混頻器的設(shè)計流程,采用級聯(lián)巴倫以提高帶寬,并且在中頻處添加中頻巴倫以提高隔離度,最終對混頻器進行了加工測試。研制的混頻器射頻、本振工作帶寬為3-7GHz,中頻工作帶寬DC-2GHz,在3-7GHz帶寬內(nèi)變頻損耗為-10~-6dB之間,三階交調(diào)截點IP3大于10 dBm,本振端口到射頻端口之間隔離度大于35 dB,本振端口到中頻端口之間隔離度大于13dB。綜上,本文研制的雙平衡混頻器頻帶寬、隔離度高,達到工程應(yīng)用要求。
[Abstract]:In order to adapt to the signal with a wide frequency-bandwidth ratio, the up-conversion occurs in front of the high-frequency receiver and the sensitivity of the receiver is improved. The design of the high-performance passive mixer can make the original equipment manufacturer optimize the receiver design. Such mixers are useful for both military and civilian applications. The original single-ended and single-balanced passive diode mixers have been abandoned due to their poor port isolation and low output frequency at intermediate frequency ports. Due to the wide local oscillation and radio frequency bandwidth, high port spacing and large input third-order Intermodulation cut-off point (IP3), the balanced mixer has been widely favored by R & D engineers. However, the insertion loss is usually-6 dB or more and the local vibration power is about 10 dBm. Because of the complexity of circuit structure, especially in microwave frequency band, the size of active mixer made by microstrip wire is very large, which is not conducive to the integration of circuit, and runs counter to the trend of miniaturization of devices. Therefore, the research on miniaturization of passive components in microwave communication still has unconquered difficulties. This paper begins with the research background and significance of miniaturized mixer, introduces its history, current research situation and development trend at home and abroad, then explains the working principle of mixer in detail, analyzes the concept of performance parameters of mixer and its calculation method. Then, the planar Baron theory is deeply studied, and then the planar Baron is simulated, verified and improved. On this basis, the multilayer Marchand Baron structure is introduced to realize miniaturization, and the performance index is verified by simulation. Based on the comparison of different mixer structures, the double balanced mixer circuit structure is selected in this paper. The HSMS2827 chip of Avago Company is used as the ring diode stack, and the radio frequency of the ADS software is carried out by using the SPICE parameter model, and the circuit structure of the double balanced mixer is selected as the circuit structure of the double balanced mixer. The diode pair of the local vibration loop is modeled and analyzed, and the impedance frequency characteristic is simulated, which provides the initial value for the Baron impedance matching. The multi-layer Marchand Balun indexes are analyzed and studied. Based on the LTCC process, the three-dimensional high-frequency electromagnetic simulation software HFSS is built and improved. Through the comparison of the improved models, the cascade Baron structure is selected to design the mixer Balun. The optimal simulation of RF, if, and local oscillator Barron is carried out. After the SNP file is derived, the combined diode model is used for cascade simulation to ensure the performance of miniaturized broadband mixer. In this paper, the design flow of double balanced mixer is introduced in detail. Cascade Balun is used to improve the bandwidth, and if Barron is added to the medium frequency to improve isolation. Finally, the mixer is processed and tested. The RF mixer is developed. The operating bandwidth of local oscillator is 3? 7 GHz, the if bandwidth DC-2GHz, is between-10~-6dB in 3-7GHz bandwidth, and the third-order Intermodulation cut-off point IP3 is more than 10 dBm,. Isolation between local port and RF port is greater than 35 dB, isolation between local port and intermediate frequency port is greater than 13 dB. In summary, the double-balanced mixer developed in this paper has wide band and high isolation, which meets the requirements of engineering application.
【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】：2016
【分類號】：TN773
本文編號：2437183
[Abstract]:In order to adapt to the signal with a wide frequency-bandwidth ratio, the up-conversion occurs in front of the high-frequency receiver and the sensitivity of the receiver is improved. The design of the high-performance passive mixer can make the original equipment manufacturer optimize the receiver design. Such mixers are useful for both military and civilian applications. The original single-ended and single-balanced passive diode mixers have been abandoned due to their poor port isolation and low output frequency at intermediate frequency ports. Due to the wide local oscillation and radio frequency bandwidth, high port spacing and large input third-order Intermodulation cut-off point (IP3), the balanced mixer has been widely favored by R & D engineers. However, the insertion loss is usually-6 dB or more and the local vibration power is about 10 dBm. Because of the complexity of circuit structure, especially in microwave frequency band, the size of active mixer made by microstrip wire is very large, which is not conducive to the integration of circuit, and runs counter to the trend of miniaturization of devices. Therefore, the research on miniaturization of passive components in microwave communication still has unconquered difficulties. This paper begins with the research background and significance of miniaturized mixer, introduces its history, current research situation and development trend at home and abroad, then explains the working principle of mixer in detail, analyzes the concept of performance parameters of mixer and its calculation method. Then, the planar Baron theory is deeply studied, and then the planar Baron is simulated, verified and improved. On this basis, the multilayer Marchand Baron structure is introduced to realize miniaturization, and the performance index is verified by simulation. Based on the comparison of different mixer structures, the double balanced mixer circuit structure is selected in this paper. The HSMS2827 chip of Avago Company is used as the ring diode stack, and the radio frequency of the ADS software is carried out by using the SPICE parameter model, and the circuit structure of the double balanced mixer is selected as the circuit structure of the double balanced mixer. The diode pair of the local vibration loop is modeled and analyzed, and the impedance frequency characteristic is simulated, which provides the initial value for the Baron impedance matching. The multi-layer Marchand Balun indexes are analyzed and studied. Based on the LTCC process, the three-dimensional high-frequency electromagnetic simulation software HFSS is built and improved. Through the comparison of the improved models, the cascade Baron structure is selected to design the mixer Balun. The optimal simulation of RF, if, and local oscillator Barron is carried out. After the SNP file is derived, the combined diode model is used for cascade simulation to ensure the performance of miniaturized broadband mixer. In this paper, the design flow of double balanced mixer is introduced in detail. Cascade Balun is used to improve the bandwidth, and if Barron is added to the medium frequency to improve isolation. Finally, the mixer is processed and tested. The RF mixer is developed. The operating bandwidth of local oscillator is 3? 7 GHz, the if bandwidth DC-2GHz, is between-10~-6dB in 3-7GHz bandwidth, and the third-order Intermodulation cut-off point IP3 is more than 10 dBm,. Isolation between local port and RF port is greater than 35 dB, isolation between local port and intermediate frequency port is greater than 13 dB. In summary, the double-balanced mixer developed in this paper has wide band and high isolation, which meets the requirements of engineering application.
【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】：2016
【分類號】：TN773
【參考文獻】
相關(guān)碩士學(xué)位論文 前2條
1 徐賀;S波段接收機射頻前端研究與設(shè)計[D];西安電子科技大學(xué);2013年
2 劉招林;移動終端系統(tǒng)中混頻器的設(shè)計與分析[D];北京交通大學(xué);2008年
，本文編號：2437183
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