本文關(guān)鍵詞：矢網(wǎng)測試裝置設(shè)計及關(guān)鍵電路實(shí)現(xiàn)　出處：《電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 矢量網(wǎng)絡(luò)分析儀 接收機(jī) 定向耦合器 變頻電路 信號隔離

【摘要】：進(jìn)入二十一世紀(jì)以來,信息化、數(shù)字化、網(wǎng)絡(luò)化、智能化成為人類世界的顯著標(biāo)簽,空間充斥著微波射頻信號,這使得信息產(chǎn)業(yè)得到迅猛發(fā)展,作為信息、數(shù)據(jù)系統(tǒng)、終端的基礎(chǔ),微波射頻器件、組件正處于爆炸式發(fā)展階段。測試是科技發(fā)展基礎(chǔ),矢量網(wǎng)絡(luò)分析儀作為微波射頻元器件最重要的測試評價工具,需要應(yīng)對各種新需求,滿足不同情況下對儀器功能性、經(jīng)濟(jì)性、實(shí)用性的要求。課題研究目標(biāo)為設(shè)計一款能夠滿足通信系統(tǒng)、信息化終端等產(chǎn)業(yè)中微波射頻電路組件科研生產(chǎn)測試需求,能夠?qū)崿F(xiàn)基本網(wǎng)絡(luò)參數(shù)測試功能,具備極高性價比、可規(guī)�；瘧�(yīng)用推廣的創(chuàng)新架構(gòu)經(jīng)濟(jì)型網(wǎng)絡(luò)分析儀。本課題主要工作包括以下幾個方面:①充分利用半導(dǎo)體產(chǎn)業(yè)技術(shù)進(jìn)步成果,采用以先進(jìn)半導(dǎo)體工藝為基礎(chǔ)設(shè)計實(shí)現(xiàn)的多信道、高性能軟件無線電收發(fā)集成電路AD9361作為接收機(jī)核心,設(shè)計系統(tǒng)整體實(shí)現(xiàn)方案。將傳統(tǒng)的三接收機(jī)、四接收機(jī)通道簡化為兩通道,不僅降低了儀器成本,同時也避免了通道間相互干擾。②設(shè)計了新型的、采用電容補(bǔ)償?shù)�、多�?jié)級聯(lián)微帶線定向耦合器。傳統(tǒng)單節(jié)微帶線定向耦合器難以達(dá)到寬頻率、高方向性的目標(biāo),利用電容補(bǔ)償、多節(jié)級聯(lián)的方式可以大大優(yōu)化定向耦合器的性能,彌補(bǔ)頻率范圍和方向性方面的不足。③設(shè)計了反向信號隔離模塊。利用放大器對信號正向放大、反向隔離的特點(diǎn),使用兩級低噪聲放大器外加固定衰減器的方式,不僅可以降低大反射信號對參考通道的干擾,同時可以補(bǔ)償激勵信號在到達(dá)待測件前由功分器、定向耦合器等器件產(chǎn)生的損耗。④由于AD9361無法覆蓋300KHz~70MHz低頻率范圍,在其前端又加入了一級上變頻電路,將低頻頻率升頻到可處理的90MHz。⑤課題還在AD9361芯片前外加前置放大器和可控衰減器,提高接收機(jī)靈敏度和動態(tài)范圍。論文從系統(tǒng)整體功能指標(biāo)出發(fā),詳細(xì)分析結(jié)構(gòu)中每個單元的指標(biāo)需求,整個系統(tǒng)的設(shè)計過程中,預(yù)先充分考慮了各種可能出現(xiàn)的問題,對單元模塊分別進(jìn)行設(shè)計和仿真優(yōu)化。實(shí)踐中對課題成果進(jìn)行測試,與標(biāo)準(zhǔn)矢量網(wǎng)絡(luò)分析儀的測試結(jié)果進(jìn)行對比分析,成功實(shí)現(xiàn)了預(yù)計目標(biāo)。
[Abstract]:Since 21th century, information, digitization, networking, intelligence has become a remarkable label in the human world, the space is full of microwave radio frequency signal, which makes the information industry develop rapidly as information. Data system, terminal foundation, microwave RF devices and components are in the explosive development stage. Testing is the basis of the development of science and technology. Vector network analyzer is the most important testing and evaluation tool for microwave RF components. We need to meet all kinds of new requirements and meet the functional, economic and practical requirements of the instrument under different circumstances. The objective of this study is to design a communication system that can meet the requirements of the communication system. In the information terminal and other industries, microwave RF circuit components scientific research and production testing requirements, can achieve the basic network parameters testing function, with very high performance and price ratio. The main work of this paper includes the following aspects: make full use of the technological progress of semiconductor industry in the following aspects: 1. Based on the advanced semiconductor technology, a multi-channel, high-performance software radio transceiver integrated circuit (AD9361) is used as the core of the receiver to design the overall implementation scheme of the system. The four-receiver channel is simplified to two channels, which not only reduces the cost of the instrument, but also avoids the interference between channels. 2. A new type of channel is designed with capacitive compensation. Traditional single-section microstrip line directional coupler is difficult to achieve the goal of wide frequency and high directivity. The performance of directional coupler can be greatly optimized by using capacitive compensation and multi-section cascade method. The reverse signal isolation module is designed to make up for the deficiency of frequency range and directivity. The characteristics of the amplifier are used to amplify the signal in the forward direction and in the reverse direction. Using a two-stage low-noise amplifier with a fixed attenuator can not only reduce the interference of the large reflection signal to the reference channel, but also compensate the excitation signal by the power divider before reaching the test piece. The loss of directional coupler and other devices. 4. Because the AD9361 can not cover the low frequency range of 300kHz / s 70MHz, a first stage up-conversion circuit is added to the front end of the device. A preamplifier and a controllable attenuator are added in front of the AD9361 chip to raise the frequency of the low frequency to 90MHz. 5. Improve the sensitivity and dynamic range of the receiver. From the system overall functional indicators, detailed analysis of each unit in the structure of the index requirements, the entire system design process. Considering all kinds of possible problems in advance, the unit modules are designed and optimized by simulation. In practice, the results of the project are tested and compared with the test results of the standard vector network analyzer. The target was successfully achieved.
【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】：2015
【分類號】：TM935

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本文編號：1357292