模擬寬帶幅相均衡器的研究
發(fā)布時間：2018-11-25 17:10
【摘要】：射頻通信系統(tǒng)中,源于射頻器件自身存在的頻率選擇性以及多級元器件級聯(lián)等造成系統(tǒng)不理想的幅相特性,主要表現(xiàn)為幅頻特性的不平坦和群時延波動,使得傳輸信號發(fā)生畸變,影響系統(tǒng)的通信質(zhì)量和傳輸速度。在發(fā)射機前端添加模擬寬帶幅度均衡器或相位均衡器,是一種最直接且行之有效的改善方法[1],由于體積、功耗、復雜度等的考慮,適合高速率通信的模擬無源均衡器引起研究者們的關注。模擬無源均衡器的均衡量從幾dB發(fā)展到十幾dB,均衡帶寬也從MHz發(fā)展到GHz[2],但是結構簡單、調(diào)試方便、低功耗、小尺寸、超寬帶以及適用于高頻段的均衡器仍有待進一步的探討和研究。本論文主要研究對象為模擬無源寬帶幅度均衡器和相位均衡器。以傳統(tǒng)集總元件均衡器為基礎,采用電阻加載微帶諧振枝節(jié)和懸置帶線等效替換集總元件兩種設計思路來實現(xiàn)結構簡單、小尺寸、超寬帶的幅度均衡器;相位均衡器方面,從X型全通網(wǎng)絡出發(fā),分析其相頻特性和群時延關系,推導出幾種實用的T型均衡網(wǎng)絡,實現(xiàn)寬帶相位均衡器。根據(jù)不同的均衡頻段與均衡目標,分別使用了集總參數(shù)結構、微帶結構和懸置帶線結構三種設計方法,最終設計了五款不同類型的幅度均衡器和三款不同類型的相位均衡器,其主要內(nèi)容如下:1)介紹了均衡器的研究背景和國內(nèi)外發(fā)展現(xiàn)狀等,論述了均衡器在通信系統(tǒng)中的重要性和必要性。2)研究了射頻器件的幅相特性及其對系統(tǒng)性能的影響;介紹了均衡器的網(wǎng)絡分析方法;同時,簡要概述了集總參數(shù)網(wǎng)絡、微帶傳輸線理論和懸置帶線理論,分析了微帶線諧振枝節(jié)的基本特性和等效電路,研究了懸置帶線等效電容、電感的原理和方法。3)模擬寬帶幅相均衡器的設計。首先,從RC并聯(lián)網(wǎng)絡和LC諧振枝節(jié)出發(fā),引出多種常用集總參數(shù)均衡器;以微帶傳輸線和懸置帶線等效集總參數(shù)電路為基礎,分別用微帶枝節(jié)替換LC諧振枝和懸置帶線等效集總元件,推導出微帶結構均衡器和懸置帶線均衡器;其次,根據(jù)均衡器網(wǎng)絡分析方法,求解各均衡結構的傳輸函數(shù),研究均衡器工作帶寬、均衡量、時延波動等的影響因子;然后,用ADS和HFSS搭建均衡器仿真電路以及三維電磁結構仿真模型,仿真電路特性并進行調(diào)試與優(yōu)化;最后,用CADENCE繪制均衡器電原理圖并印制電路板,以及生產(chǎn)加工后對PCB實物電路進行焊接、調(diào)試、測試以及結果分析。
[Abstract]:In the radio frequency communication system, the frequency selectivity and the cascade of multistage components caused the unsatisfactory amplitude-phase characteristics of the radio frequency communication system, which mainly show the uneven amplitude and frequency characteristics and the group delay fluctuation. The distortion of the transmission signal affects the communication quality and transmission speed of the system. Adding analog wideband amplitude equalizer or phase equalizer to the front end of transmitter is the most direct and effective improvement method [1] because of the consideration of volume, power consumption, complexity, etc. Analog passive equalizer for high-rate communication has attracted researchers' attention. The equalizer of analog passive equalizer develops from a few dB to a dozen dB, equalization bandwidth from MHz to GHz [2], but the structure is simple, the debugging is convenient, the power consumption is low, and the size is small. UWB and equalizer for high frequency band still need to be further discussed and studied. The main research objects of this thesis are analog passive wideband amplitude equalizer and phase equalizer. Based on the traditional lumped element equalizer, the amplitude equalizer with simple structure, small size and ultra-wideband is realized by using two design ideas: resistive loaded microstrip resonant branch and equivalent replacement lumped element. In the aspect of phase equalizer, based on X-type all-pass network, the relationship between phase frequency characteristic and group delay is analyzed, and several practical T-type equalizer networks are deduced to realize wide-band phase equalizer. According to different equalization frequency bands and equalization targets, three design methods, lumped parameter structure, microstrip structure and suspended strip line structure, are used respectively. Finally, five different types of amplitude equalizers and three different types of phase equalizers are designed. The main contents are as follows: 1) the research background and development status of equalizer at home and abroad are introduced, and the importance and necessity of equalizer in communication system are discussed. 2) the amplitude-phase characteristic of RF device and its influence on system performance are studied. The network analysis method of equalizer is introduced. At the same time, the lumped parameter network, microstrip transmission line theory and mount strip line theory are briefly summarized. The basic characteristics and equivalent circuit of the resonant section of the microstrip line are analyzed, and the equivalent capacitance of the suspended strip line is studied. Principle and method of inductance. 3) Design of analog wideband amplitude and phase equalizer. Firstly, based on the RC parallel network and the LC resonance branch, many common lumped parameter equalizers are introduced. Based on the equivalent lumped circuit of microstrip transmission line and mount strip line, the LC resonance branch and the mount strip line equivalent lumped element are replaced by the microstrip branch, respectively, and the microstrip structure equalizer and the mount strip line equalizer are derived. Secondly, according to the equalizer network analysis method, the transmission function of each equalization structure is solved, and the influence factors of the equalizer working bandwidth, equalizer, delay fluctuation and so on are studied. Then, the simulation circuit of equalizer and the simulation model of three-dimensional electromagnetic structure are built with ADS and HFSS, and the characteristics of simulation circuit are debugged and optimized. Finally, the electric schematic diagram of equalizer and printed circuit board are drawn with CADENCE, and the PCB physical circuit is welded, debugged, tested and analyzed after production and processing.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN715
本文編號：2356847
[Abstract]:In the radio frequency communication system, the frequency selectivity and the cascade of multistage components caused the unsatisfactory amplitude-phase characteristics of the radio frequency communication system, which mainly show the uneven amplitude and frequency characteristics and the group delay fluctuation. The distortion of the transmission signal affects the communication quality and transmission speed of the system. Adding analog wideband amplitude equalizer or phase equalizer to the front end of transmitter is the most direct and effective improvement method [1] because of the consideration of volume, power consumption, complexity, etc. Analog passive equalizer for high-rate communication has attracted researchers' attention. The equalizer of analog passive equalizer develops from a few dB to a dozen dB, equalization bandwidth from MHz to GHz [2], but the structure is simple, the debugging is convenient, the power consumption is low, and the size is small. UWB and equalizer for high frequency band still need to be further discussed and studied. The main research objects of this thesis are analog passive wideband amplitude equalizer and phase equalizer. Based on the traditional lumped element equalizer, the amplitude equalizer with simple structure, small size and ultra-wideband is realized by using two design ideas: resistive loaded microstrip resonant branch and equivalent replacement lumped element. In the aspect of phase equalizer, based on X-type all-pass network, the relationship between phase frequency characteristic and group delay is analyzed, and several practical T-type equalizer networks are deduced to realize wide-band phase equalizer. According to different equalization frequency bands and equalization targets, three design methods, lumped parameter structure, microstrip structure and suspended strip line structure, are used respectively. Finally, five different types of amplitude equalizers and three different types of phase equalizers are designed. The main contents are as follows: 1) the research background and development status of equalizer at home and abroad are introduced, and the importance and necessity of equalizer in communication system are discussed. 2) the amplitude-phase characteristic of RF device and its influence on system performance are studied. The network analysis method of equalizer is introduced. At the same time, the lumped parameter network, microstrip transmission line theory and mount strip line theory are briefly summarized. The basic characteristics and equivalent circuit of the resonant section of the microstrip line are analyzed, and the equivalent capacitance of the suspended strip line is studied. Principle and method of inductance. 3) Design of analog wideband amplitude and phase equalizer. Firstly, based on the RC parallel network and the LC resonance branch, many common lumped parameter equalizers are introduced. Based on the equivalent lumped circuit of microstrip transmission line and mount strip line, the LC resonance branch and the mount strip line equivalent lumped element are replaced by the microstrip branch, respectively, and the microstrip structure equalizer and the mount strip line equalizer are derived. Secondly, according to the equalizer network analysis method, the transmission function of each equalization structure is solved, and the influence factors of the equalizer working bandwidth, equalizer, delay fluctuation and so on are studied. Then, the simulation circuit of equalizer and the simulation model of three-dimensional electromagnetic structure are built with ADS and HFSS, and the characteristics of simulation circuit are debugged and optimized. Finally, the electric schematic diagram of equalizer and printed circuit board are drawn with CADENCE, and the PCB physical circuit is welded, debugged, tested and analyzed after production and processing.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN715
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