SAW器件插入损耗的电路补偿方法研究

发布时间：2018-06-05 01:49

本文选题：SAW器件 + 插入损耗　；参考：《贵州大学》2015年硕士论文

【摘要】：SAW(Surface Acoustic Wave)器件的应用已遍布很多的领域,如移动通信、广播电视、航空航天、及雷达等,尤其是应用在移动通信设备上,随着移动通信技术的快速发展,对SAW器件的需求越来越大。由于SAW器件本身的物理特性是会对其处理的信号产生衰减,从而导致后端处理困难。常用的外部补偿电路往往只考虑增益的提升,没有顾及输入/输出电路的匹配,从而造成反射系数过大,相位失真严重,甚至产生全反射而无信号输出。本文所研究的主要内容就是找到一种合适的方法来补偿SAW器件对信号的衰减。一是标准50Ω输入/输出阻抗SAW器件的功率补偿电路设计与仿真;二是非标准50Ω输入/输出阻抗SAW器件的检测、控制及补偿电路设计与仿真,包括容性和感性失真的检测、控制及能量补偿电路的设计与仿真。本文采用共栅结构作为输入匹配,引进噪声抵消技术减小噪声系数,改进后的补偿电路通过ADS2011软件进行仿真,仿真结果表明,改进后的补偿电路可以较好地补偿SAW器件插入损耗,且输入匹配性能良好及噪声系数低。然后仿真了容性失配和感性失配的电路,由仿真结果可以看出,输入反射系数与噪声系数均不能满足设计要求,故通过一个检测电路检测SAW器件的阻抗是带有容性阻抗还是带有感性阻抗,根据检测电路的结果进行容性补偿或是感性补偿,根据电路仿真结果表明,阻抗补偿后,输入反射系数、噪声系数均有较大的改善满足设计要求,说明该补偿方法是可行的。
[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.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN65

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