多倍频程MMIC数字移相器的研究与设计

【作者】 王超宇；

【导师】 戴永胜； 王安劳；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2009， 硕士

【摘要】 微波单片集成电路(MMIC)数字移相器是现代相控阵雷达系统中收发(T/R)组件的核心组成部分,其性能的优劣对相控阵雷达的性能有着直接的影响。本文针对多频段宽带MMIC数字移相器进行了研究。根据本课题研究的单片多倍频程数字移相器的要求,从电路原理、结构特点、指标要求、尺寸要求等方面综合考虑,重点针对高/低通滤波器拓扑与反射型拓扑做了分析和研究。依据分析、比较的结果确定最佳方案,最后对6～18GHz的多频段数字移相器进行了设计。本文还对MMIC电路中元器件的建模进行了简要介绍。MMIC电路中无源元件和有源器件形式多样,需要采用合适的方法对相关元器件进行建模,即电路模型参数提取。设计过程中,采用工程建模方法对电路中的元器件和控制器件(PHEMT)建立了等效电路模型。整个建模过程是紧密结合MMIC工艺线提供的有关参数进行的,从而保证了设计的可信性和准确性。本文首先对移相器、MMIC等概念以及应用背景进行了简单的介绍。然后对各种类型的移相器进行了分析,根据上述结果确定了5.625°/11.25°/22.5°相移位采用高/低通滤波器型拓扑,45°/90°/180°采用反射型拓扑的设计方案。接着,利用Agilent公司的ADS软件,分别对各个相移位的原理图电路进行了的优化。然后根据电性能优化结果进行版图设计,并结合版图进行仿真优化。最后,我们选取了最优的方案对6～18GHz工作频段内5位MMIC数字移相器进行了流片和测试。测试结果表明,设计与测试结果基本吻合。本课题设计的多倍频程5位MMIC数字移相器实物测试结果显示:在6～18GHz的工作频率内,11.25°相移位的相移误差＜1.65°;22.5°相移位的相移误差＜2.4°;45°相移位的相移误差＜4.1°;90°相移位的相移误差＜9.2°;180°相移位的相移误差＜8°。插入损耗保持在7.5dB～11.8dB的范围内,输入端与输出端的驻波比均小于2.5。五位数字移相器的芯片面积为3.555 mm×4.055 mm×0.1 mm。更多还原

【Abstract】 Digital phase shifter,based on RF monolithic microwave integrated circuit(MMIC) technology,is the core component of the transmit/receive(T/R) in the modern phased array radar system.The performance of the phase shifter has a direct impact on phased array radar system.This article introduces the research about multi-band MMIC digital phase shifter.Based on the requirement of this research,we carefully analyze the high/low pass structure and the reflective structure from the circuit theory,the character of the topology,the requirement of the specification,and the requirement of the size.According the result above, we determine the best program for designing the 6～18 GHz multi-band digital phase shifter.In this article,we also briefly introduce the knowledge about modeling the components which are used in the MMIC circuit.The passive component and the active component,in the circuit,have many forms,so we should model the component in right way,which is usually called circuit model parameter extraction.In the design process,we establish the equivalent model for the components and the control devices(PHEMT) in the circuit by the application model theory.Through the model process above,we could guarantee the correctness of the design.At the beginning of the article,we briefly introduce the concepts of phase shifter,MMIC and the application background.And in the middle of the article,we carefully analyze various types phase shifters and get some results,after summing up the characters of the various phase shifters circuit topology and the basic principles,we finally determine the design program,for instance,using the high/low pass structure to design the 5.625°/11.25°/22.5°phase shifter,and using the reflective structure to design the 45°/90°/180°phase shifter.And then,in the research process,we simulate various schematic circuits by Agilent ADS software. Based on the ideal optimization results above,we layout the schematic circuit,and optimize layout circuit parameter.Finally,by selecting one of the programs,we produce and test the 5 bits multi-band MMIC digital phase shifter,working in the frequency range of 6～18GHz. The test data shows that the test results accord the design result.The test datas are as follows:in the working frequency,the error of 11.25°bit is less than 1.65°;the error of 22.5°bit is less than 2.4°;the error of 45°bit is less than 4.1°;the error of 90°bit is less than 9.2°;the error of 180°bit is less than 8°.The insertion loss is restriction in the range of 7.5dB～11.8dB,input and output VSWR is less than 2.5.The area of multi-band MMIC 5-bits digital phase shifter is 3.555mm×4.055mm×0.1mm.更多还原