X波段MMIC低噪声放大器的设计

发布时间：2018-06-19 15:11

  本文选题：X波段 + 单片微波集成电路　； 参考：《北京工业大学》2015年硕士论文

【摘要】：无线通讯技术与人们的日常生活息息相关,其应用领域也是越来越广泛。不论是个人还是国家,对于高性能的微波集成电路都有着很大需求。本文对X波段MMIC低噪声放大器的电路进行了研究和设计,主要包括以下内容:MMIC低噪声放大器的背景调研,低噪声放大器设计参数介绍,相关器件模型建立和工艺分析,最后详细介绍该放大器的设计过程。论文选用了台湾稳懋半导体公司的0.15um GaAs Low Noise pHEMT工艺线,使用ADS软件仿真设计了一个工作频率在8~12GHz波段的MMIC低噪声放大器。本论文设计的低噪声放大芯片的拓扑结构为三级放大器级联的结构。第一级采用源端负反馈技术和衰减电路,从而提高晶体管的稳定性;该级放大器对系统噪声贡献最大,因此设计时主要针对噪声进行设计,输入端采用了最小噪声系数匹配。第二级因为第一级设计增益不够高,因此也主要针对噪声做匹配。由于增益随频率升高呈下降趋势,而且第三级电路噪声几乎不对系统有影响。所以第三级为补偿增益采用了负反馈结构,目的是改善系统的增益平坦度。每一级根据不同的指标要求分别对管芯及其匹配电路进行设计,同时为便于级联,将各级的输入输出匹配到50欧姆,然后再进行三级的级联以及电路的优化设计。最后制作版图,反复进行Momentum电磁仿真,调整版图设计以达到最佳仿真效果。最终设计实现的X波段MMIC低噪声放大器在8~12GHz内有良好的性能,主要指标为:整体噪声系数小于1.2dB,总增益大于20dB,工作频率内增益平坦度小于±1.5dB,输入输出驻波比小于2.0,都满足了预期的设计目标。
[Abstract]:Wireless communication technology is closely related to people's daily life, and its application field is more and more extensive. Whether individuals or countries, there is a great demand for high-performance microwave integrated circuits. In this paper, the circuit of X-band MMIC low noise amplifier is studied and designed, which includes the following contents: the background investigation of the low noise amplifier, the introduction of the design parameters of the low noise amplifier, the establishment of the related device model and the process analysis. Finally, the design process of the amplifier is introduced in detail. In this paper, the 0.15um low noise pHEMT process line of Taiwan stabilized Semiconductor Company is selected, and an MMIC low noise amplifier with operating frequency of 81GHz is designed by using ads software. The topology of the low noise amplifier chip designed in this paper is three stage amplifier cascade structure. In the first stage, the negative feedback technique and attenuation circuit are used to improve the stability of transistors. The amplifier contributes the most to the noise of the system, so it is mainly designed for noise, and the minimum noise coefficient matching is used in the input. Because the first stage design gain is not high enough, the second stage is mainly aimed at noise matching. Because the gain decreases with the increase of frequency, and the noise of the third stage circuit has little effect on the system. Therefore, the third stage adopts a negative feedback structure to compensate the gain, which aims to improve the gain flatness of the system. The core and its matching circuit are designed for each stage according to different index requirements. In order to facilitate the cascade, the input and output of each level are matched to 50 ohms, and then the three-stage cascade and the circuit optimization design are carried out. Finally, the layout is made, the moment electromagnetic simulation is carried out repeatedly, and the layout design is adjusted to achieve the best simulation effect. Finally, the X-band MMIC low noise amplifier has good performance in 81GHz. The main parameters are as follows: the overall noise coefficient is less than 1.2 dB, the total gain is more than 20 dB, the gain flatness is less than 卤1.5 dB, and the input and output VSWR is less than 2.0.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.3
，

本文编号：2040300