多路微波频率源设计

发布时间：2018-06-02 11:41

本文选题：频率源 + 锁相环　；参考：《电子科技大学》2015年硕士论文

【摘要】：微波频率源是当今现代电子系统的核心部件之一,很多现代电子系统的性能好坏直接依赖于微波频率源的指标。所以设计高性能的微波频率源是现代电子技术中一个重要的研究方向。本文课题来源是某雷达系统的收发组件项目,需要我们设计多路微波频率源以满足收发模块对多路本振信号的需求。多路微波频率源具体分为两部分:其一是提供多路固定频点间切换输出信号的多路锁相频率源,另一个则是提供捷变频率信号的多路快速跳频源。多路锁相频率源中包括了超过20个锁相点频源,其中部分点频源通过开关电路切换输出,输出的点频中最低的频率是2GHz,频率最高的12.4GHz。多路快速跳频源则通过DDS+PLL混合频率合成方案实现4路在C波段的快速跳频输出。本文首先对频率合成技术进行了概述并介绍了频率源发展现状,简单说明课题所涉及的频率合成技术技术的理论知识,包括PLL与DDS各自的电路结构,性能指标及相位噪声或杂散分析。接着,本文详细阐述了多路锁相频率源的设计过程。首先,给出了系统框图,以及对器件的选择。其次介绍了环路滤波器和单片机控制模块的设计,给出了具体的环路仿真和寄存器配置实例。然后介绍了整个多路锁相频率源系统的电源模块和开关控制模块的设计过程。随后,本文又介绍了多路快速跳频源的设计。通过对当前DDS和PLL混合频率合成的分析,确定了快速跳频源采用DDS先倍频再与PLL混频的方案。分别对方案中时钟信号的产生模块、DDS模块、倍频链路、本振以及混频输出模块各个主要部分的设计做了阐述。最终本文分别给出多路锁相频率源与多路快速跳频源各自的电路实物与测试结果,测试结果满足预期指标,并对调试中出现的一些问题做了说明。
[Abstract]:Microwave frequency source is one of the core components of modern electronic system. The performance of many modern electronic systems depends directly on the index of microwave frequency source. Therefore, the design of high-performance microwave frequency source is an important research direction in modern electronic technology. The source of this thesis is the transceiver module of a radar system. We need to design a multi-channel microwave frequency source to meet the needs of the transceiver module for the multi-channel local oscillator signal. The multi-channel microwave frequency source is divided into two parts: one is to provide a multi-channel phase-locked frequency source for switching output signals between multiple fixed frequency points, the other is to provide a multi-channel fast frequency hopping source for agile frequency signals. The multi-channel phase-locked frequency source includes more than 20 phase-locked point frequency sources, some of which switch output through switching circuit. The lowest frequency of the output point frequency is 2GHz, and the highest frequency is 12.4 GHz. The multi-channel fast frequency hopping (FH) source is realized by the DDS PLL hybrid frequency synthesis scheme, and four fast FH outputs in C band are realized. In this paper, the frequency synthesis technology is summarized and the current development of frequency source is introduced. The theoretical knowledge of frequency synthesis technology, including the circuit structure of PLL and DDS, is briefly explained. Performance index and phase noise or stray analysis. Then, the design process of multi-channel phase-locked frequency source is described in detail. First, the system block diagram and the selection of the device are given. Secondly, the design of loop filter and single chip microcomputer control module is introduced, and the loop simulation and register configuration examples are given. Then the design process of the power module and switch control module of the multi-channel phase-locked frequency source system is introduced. Then, this paper introduces the design of multi-channel fast frequency hopping source. Based on the analysis of the current hybrid frequency synthesis of DDS and PLL, the scheme of fast frequency hopping source using DDS first frequency doubling and then mixing with PLL is determined. The design of DDS module, frequency doubling link, local oscillator and mixing output module are described respectively. In the end, the paper gives the actual circuit and test results of multi-channel phase-locked frequency source and multi-channel fast frequency hopping source respectively, and the test results meet the expected targets, and some problems in debugging are explained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN74

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