宽带信号发生器的关键微波电路设计

发布时间：2018-03-10 16:51

本文选题：宽带　切入点：信号发生器　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：在现在射频微波测试领域中,信号发生器是极为最重要的、也是应用最为普遍的电子仪器之一。大多数的射频微波器件的调试、测试,以及在其它电子设备的维修检测中常常需都要使用到信号发生器。因此,能研究设计出一台低成本、高性能的信号发生器是十分重要和有意义的。本文主要研究的是信号发生器中一些关键微波电路,主要包括谐波混频器和倍频滤波组件。谐波混频器主要有输入输出功放模块、巴伦、倍频器、单平衡混频器、低通滤波器几部分组成。输入输出功放模块分别用于放大本振和中频功率;选用巴伦的目的是输出等幅反向的两路本振信号;选用AEROFLEX公司的MSPD2018相位检波器作为混频器,该混频器由单平衡混频器和阶跃恢复二极管(SRD)并联组成,本振信号(600-900MHz)经SRD倍频n次后的谐波信号与射频信号(3-10GHz)混频,混频后产生中频信号(30-68MHz);低通滤波器则负责滤除不需要的杂波信号,主要包括基波信号、上变频信号以及较大的下变频信号。在谐波混频器设计中应用了ADS软件进行了仿真分析。谐波混频器的测试结果是:在3-10GHz范围内,本振与射频的隔离度为18-25dB,变频损耗最小为11dB,最大为26dB,但考虑到为宽带高次(最高为16次谐波混频)谐波混频,总体来说,谐波混频器具有较好性能。倍频滤波组件主要由微波开关、倍频器、带通滤波器几部分组成。输入信号为3-10GHz,经微波开关(单刀双掷)分两路输出,一路直接输出;另一路输给倍频器,倍频器主要进行2次倍频,倍频后的信号输出给三个带通滤波器,带通滤波器的任务是滤出10-13GHz、13-16GHz以及16-20GHz的三段通带信号。带通滤波器采用了交指型结构,具有滤波性能良好、面积小、结构紧凑等优点,并应用CST软件进行仿真分析。
[Abstract]:In the field of RF microwave testing, signal generator is the most important and one of the most widely used electronic instruments. And it is often necessary to use signal generators in the maintenance and inspection of other electronic equipment. Therefore, we can study and design a low-cost one. High performance signal generator is very important and meaningful. This paper mainly studies some key microwave circuits in the signal generator, including harmonic mixer and frequency doubling filter module. The input and output power amplifier modules are used to amplify local oscillator and intermediate frequency power respectively. The purpose of Barron is to output two local oscillator signals with equal amplitude and reverse. The MSPD2018 phase detector of AEROFLEX Company is selected as mixer. The mixer is composed of a single balanced mixer and a step recovery diode (SRD) in parallel. The local oscillator signal is mixed with the harmonic signal of SRD frequency doubling n times and the radio frequency signal (RF signal) by 600-900MHz). The intermediate frequency signal is produced after mixing, and the low-pass filter is responsible for filtering unwanted clutter signals, including the fundamental signal. The upconversion signal and the large downconversion signal are simulated and analyzed by using ADS software in the design of harmonic mixer. The test results of harmonic mixer are as follows: in the range of 3-10GHz, The isolation between local oscillator and radio frequency is 18-25 dB, the minimum frequency loss is 11dB, and the maximum is 26dB.However, considering the wide band high order (up to 16 harmonic mixing) harmonic mixing, generally speaking, The harmonic mixer has good performance. The frequency doubling filter module is mainly composed of microwave switch, frequency multiplier and band-pass filter. The input signal is 3-10 GHz. The other one is lost to the frequency multiplier, which is mainly used to double the frequency twice. The signal after doubling the frequency is outputted to three bandpass filters. The task of the band-pass filter is to filter out the 3-pass band signals of 10-13 GHz and 16-20 GHz. It has the advantages of good filtering performance, small area, compact structure and so on. The simulation analysis is carried out by using CST software.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935

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