本文選題：SAW器件 + 插入損耗　； 參考：《貴州大學(xué)》2015年碩士論文

【摘要】：SAW(Surface Acoustic Wave)器件的應(yīng)用已遍布很多的領(lǐng)域,如移動通信、廣播電視、航空航天、及雷達等,尤其是應(yīng)用在移動通信設(shè)備上,隨著移動通信技術(shù)的快速發(fā)展,對SAW器件的需求越來越大。由于SAW器件本身的物理特性是會對其處理的信號產(chǎn)生衰減,從而導(dǎo)致后端處理困難。常用的外部補償電路往往只考慮增益的提升,沒有顧及輸入/輸出電路的匹配,從而造成反射系數(shù)過大,相位失真嚴重,甚至產(chǎn)生全反射而無信號輸出。本文所研究的主要內(nèi)容就是找到一種合適的方法來補償SAW器件對信號的衰減。一是標準50Ω輸入/輸出阻抗SAW器件的功率補償電路設(shè)計與仿真;二是非標準50Ω輸入/輸出阻抗SAW器件的檢測、控制及補償電路設(shè)計與仿真,包括容性和感性失真的檢測、控制及能量補償電路的設(shè)計與仿真。本文采用共柵結(jié)構(gòu)作為輸入匹配,引進噪聲抵消技術(shù)減小噪聲系數(shù),改進后的補償電路通過ADS2011軟件進行仿真,仿真結(jié)果表明,改進后的補償電路可以較好地補償SAW器件插入損耗,且輸入匹配性能良好及噪聲系數(shù)低。然后仿真了容性失配和感性失配的電路,由仿真結(jié)果可以看出,輸入反射系數(shù)與噪聲系數(shù)均不能滿足設(shè)計要求,故通過一個檢測電路檢測SAW器件的阻抗是帶有容性阻抗還是帶有感性阻抗,根據(jù)檢測電路的結(jié)果進行容性補償或是感性補償,根據(jù)電路仿真結(jié)果表明,阻抗補償后,輸入反射系數(shù)、噪聲系數(shù)均有較大的改善滿足設(shè)計要求,說明該補償方法是可行的。
[Abstract]:The applications of SAW (Surface Acoustic Wave) devices have been used in many fields, such as mobile communications, radio and television, aerospace, and radar, especially in mobile communication devices. With the rapid development of mobile communication technology, the demand for SAW devices is increasing. Because the physical characteristics of the SAW device itself are the signals to be processed. In common use of external compensation circuits, the main content of this paper is to find a suitable method. The main content of this paper is to find a suitable method. Compensation for the attenuation of SAW devices for signals. One is the design and Simulation of the power compensation circuit for standard 50 OMEGA / output impedance SAW devices; two is the detection of non standard 50 Omega input / output impedance SAW devices, control and compensation circuit design and simulation, including capacitive and perceptual distortion detection, control and energy compensation circuit design and simulation. The co grid structure is used as input matching, noise canceling technology is introduced to reduce the noise coefficient. The improved compensation circuit is simulated by ADS2011 software. The simulation results show that the improved compensation circuit can better compensate for the insertion loss of SAW devices, and the input matching performance is good and the noise coefficient is low. Then the capacitive mismatch and the simulation are simulated. The circuit of perceptual mismatch can be seen from the simulation results that both the input reflection coefficient and the noise coefficient can not meet the design requirements. So the impedance of the SAW device is detected with a capacitive impedance or a perceptual impedance by a detection circuit. According to the results of the detection circuit, the capacitance compensation or the perceptual compensation is made, according to the circuit simulation result table. After the impedance compensation, the input reflection coefficient and noise figure have been greatly improved to meet the design requirements, indicating that the compensation method is feasible.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN65

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本文編號：1979874