【摘要】：通信、雷達(dá)技術(shù)經(jīng)過(guò)長(zhǎng)足的發(fā)展,低頻段的頻譜資源變的越來(lái)越匱乏,毫米波通信所具有高達(dá)270G的頻譜資源及短波長(zhǎng)帶來(lái)的小型化優(yōu)點(diǎn)使與其相關(guān)的技術(shù)迅速發(fā)展。微波毫米波頻率綜合器作為通信設(shè)備中關(guān)鍵組成部分,它輸出頻率的穩(wěn)定度、準(zhǔn)確度直接影響系統(tǒng)的整體性能。建立在Ku頻段上變頻通信設(shè)備研制的基礎(chǔ)上,本論文主要對(duì)Ku頻段頻率綜合器的研究設(shè)計(jì)進(jìn)行論述。本文首先對(duì)比分析直接式頻率合成、鎖相式頻率合成、直接數(shù)字式頻率合成三種合成方式的優(yōu)缺點(diǎn),確定各自分別適用的具體工程場(chǎng)景。其次,根據(jù)系統(tǒng)指標(biāo)要求分析推算鎖相式頻率合成和直接數(shù)字式頻率合成的輸出頻譜,并且結(jié)合多種混合式頻率合成方式進(jìn)行關(guān)鍵指標(biāo)分析,重點(diǎn)是每種頻率合成方式對(duì)相位噪聲、頻率步進(jìn)、雜散的影響。最終,確定以DDS激勵(lì)PLL和PDRO混頻的方式實(shí)現(xiàn)系統(tǒng)頻率合成方案設(shè)計(jì),并采用可變頻率的時(shí)鐘及規(guī)避出現(xiàn)近端雜散頻段的方法來(lái)進(jìn)一步降低頻譜雜散。在該方案的基礎(chǔ)上,結(jié)合選型器件,利用ADIsimPLL和ADIsimDDS兩款軟件對(duì)相位噪聲和雜散進(jìn)行分析,進(jìn)一步驗(yàn)證方案的可行性。同時(shí),使用ADS和HFSS進(jìn)行濾波器的設(shè)計(jì)優(yōu)化,保證輸出頻譜達(dá)到系統(tǒng)要求。最后,使用Protel, AutoCAD、Solidworks等工具軟件進(jìn)行電路原理圖、版圖和腔體結(jié)構(gòu)的設(shè)計(jì),完成小步進(jìn)Ku波段低相噪低雜散頻率合成器的研制。最終,系統(tǒng)實(shí)現(xiàn)Ku波段1Hz步進(jìn)、相位噪聲低于-90dBc/Hz@10kHz、雜散抑制優(yōu)于60dBc的本振信號(hào)輸出,并具有1.5GHz的輸出帶寬。
[Abstract]:With the rapid development of communication and radar technology, the spectrum resources in the low frequency band become more and more scarce. The millimeter wave communication has the advantages of up to 270 gigabytes of spectrum resources and miniaturization of short wavelength, which makes the related technology develop rapidly. Microwave millimeter wave frequency synthesizer is a key component of communication equipment. Its output frequency stability and accuracy directly affect the overall performance of the system. Based on the development of Ku up-conversion communication equipment, this paper mainly discusses the research and design of Ku frequency synthesizer. In this paper, the advantages and disadvantages of direct frequency synthesis, phase-locked frequency synthesis and direct digital frequency synthesis are compared and analyzed. Secondly, the output frequency spectrum of phase-locked frequency synthesis and direct digital frequency synthesis are analyzed according to the requirements of the system index, and the key indexes are analyzed in combination with a variety of hybrid frequency synthesis methods. The emphasis is on the effect of each frequency synthesis mode on phase noise, frequency stepping and spurious. Finally, the scheme of system frequency synthesis is designed by DDS exciting PLL and PDRO mixing, and the method of variable frequency clock and avoiding near-end spurious band is adopted to further reduce the frequency spurious. On the basis of this scheme, the phase noise and spurious noise are analyzed by ADIsimPLL and ADIsimDDS, and the feasibility of the scheme is further verified. At the same time, ADS and HFSS are used to optimize the filter design to ensure that the output spectrum meets the system requirements. Finally, the circuit principle, layout and cavity structure are designed by using Protel, AutoCAD,Solidworks and other tools, and the low phase noise low spurious frequency synthesizer in the small step Ku band is developed. Finally, the Ku band 1Hz step is realized, the phase noise is less than -90 dBc / Hz @ 10kHz, the spurious suppression is superior to the local oscillator output of 60dBc, and the output bandwidth of 1.5GHz is obtained.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN74
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本文編號(hào)：2289392