發(fā)布時(shí)間：2018-06-05 16:19

  本文選題：頻率綜合器 + 鎖相環(huán)　； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：頻率綜合器在現(xiàn)代電子系統(tǒng)領(lǐng)域內(nèi)應(yīng)用廣泛,被稱為電子系統(tǒng)的心臟。隨著科學(xué)技術(shù)水平的不斷提升,對頻率綜合器的指標(biāo)的要求也越來越高,其中頻率切換時(shí)間作為重要的指標(biāo)之一,逐漸成為研究的熱點(diǎn)。YIG調(diào)諧振蕩器(簡稱YTO),是以YIG鐵氧體小球作為諧振源的微波振蕩器。相比VCO(壓控振蕩器)其調(diào)諧帶寬可以做到很寬,因?yàn)閅IG振蕩器具有很高的Q值,其相位噪聲性能優(yōu)異,由于其線性度好、調(diào)諧范圍寬、供電簡單等優(yōu)點(diǎn)廣泛應(yīng)用于電子對抗、頻譜分析儀、抗干擾接收機(jī)及微波儀器中做本地振蕩器。由于YTO激磁線圈中電感的存在和振蕩電路的渦流效應(yīng),使得YTO存在一定的磁滯效應(yīng),影響其快速的頻率響應(yīng)能力。如何減小其動(dòng)態(tài)滯后效應(yīng)從而提高調(diào)諧速度,是本文研究的重點(diǎn)。本文采用基于YTO為主振的頻率合成方案,實(shí)現(xiàn)一款寬頻帶、低相噪的快速切換頻率綜合器。本文首先介紹了頻率合成技術(shù)的基本原理,包括直接頻率合成技術(shù)、鎖相式頻率合成技術(shù)、直接數(shù)字頻率合成技術(shù),并給出了頻率切換時(shí)間的測量方法。經(jīng)過方案對比,平衡系統(tǒng)指標(biāo)的需求,最終采用了以YTO為振蕩源的DDS激勵(lì)PLL的混合式頻率合成方案。針對YTO的動(dòng)態(tài)滯后效應(yīng),通過分析YTO的電路模型,論述了其頻率滯后特性中電流對電壓、磁場對電流的滯后,分析了頻率切換時(shí)即階躍電壓下YTO的輸出響應(yīng)方程,并以此給出加快頻率響應(yīng)的理論依據(jù)。采用了在頻率切換過程中疊加調(diào)諧沖擊電壓的方案,克服YTO的動(dòng)態(tài)滯后效應(yīng),使得頻率輸出快速進(jìn)入捕獲帶并適時(shí)恢復(fù)正常預(yù)置值,實(shí)現(xiàn)頻率的快速切換。本文給出了方案的具體實(shí)現(xiàn),對關(guān)鍵電路模塊給出了設(shè)計(jì)和仿真,通過FPGA實(shí)現(xiàn)對系統(tǒng)的程序控制,完成了系統(tǒng)的整體設(shè)計(jì)。最后通過調(diào)試,測試,給出了最終的測試結(jié)果,滿足了系統(tǒng)的設(shè)計(jì)指標(biāo)。
[Abstract]:Frequency synthesizer is widely used in the field of modern electronic system, which is called the heart of electronic system. With the continuous improvement of the level of science and technology, the demand for the index of frequency synthesizer is becoming higher and higher. Frequency switching time is one of the important indexes, and it has gradually become a hot.YIG tuned oscillator (YTO), which is YI G ferrite ball as the resonant source of the microwave oscillator. Compared with the VCO (voltage controlled oscillator), the tuning bandwidth can be very wide, because the YIG oscillator has a very high Q value, its phase noise performance is excellent, because of its good linearity, wide tuning range, simple power supply and so on, it is widely used in electronic countermeasures, spectrum analyzer, anti-jamming receiver. Because of the existence of inductors in the YTO magnetizing coil and the eddy current effect of the oscillating circuit, the YTO has a certain hysteresis effect, which affects its fast frequency response ability. How to reduce the dynamic hysteresis effect and improve the tuning speed is the key point of this paper. This paper adopts the main vibration based on YTO. In this paper, the basic principle of frequency synthesis technology, including direct frequency synthesis, phase-locked frequency synthesis and direct digital frequency synthesis, is introduced in this paper, and the method of measuring frequency switching time is given. In order to meet the requirement of the system index, the hybrid frequency synthesis scheme of DDS excited PLL with YTO as the oscillator is finally adopted. According to the dynamic hysteresis effect of YTO, by analyzing the circuit model of YTO, the hysteresis of the current to voltage and magnetic field to the current in the frequency hysteresis characteristics is discussed, and the output response of YTO under the step voltage is analyzed. The theoretical basis for accelerating the frequency response is given, and a scheme to overlay the tuning impact voltage in the process of frequency switching is adopted to overcome the dynamic hysteresis effect of YTO, make the frequency output quickly enter the capture band and restore the normal preset value at the right time, and realize the fast switching of the frequency. This paper gives the concrete realization of the scheme, and the key to the key. The circuit module gives the design and simulation, realizes the program control to the system through FPGA and completes the whole design of the system. Finally, the final test results are given through debugging and testing, and the design index of the system is satisfied.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN74

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本文編號：1982608