本文選題：LC振蕩器 + 相位噪聲　； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：在眾多軍用和民用領(lǐng)域中都運用到了頻率信號源,而且其運用日益廣泛。在導(dǎo)航與雷達、衛(wèi)星跟蹤、宇宙通訊以及時間與頻率計量等領(lǐng)域也被廣泛應(yīng)用。隨著現(xiàn)代技術(shù)的逐步發(fā)展,市場需求開始對信號源精度的要求愈來愈嚴格。所以,作為振蕩器作為頻率源的電子系統(tǒng)中必不可少的重要部分,人們對其要求也精準了許多。但是振蕩器的相位噪聲成為限制許多電子系統(tǒng)性能的一個至關(guān)重要的因素,人們不得不想盡辦法去改善振蕩器的相位噪聲來提高頻率信號源的性能以達到更佳的市場需求指標。LC振蕩器由于低成本,可調(diào)范圍廣的原因,也存在一定的市場應(yīng)用。因而,在實際LC振蕩器的設(shè)計與實現(xiàn)中,深入研究其相位噪聲理論并提出改善相位噪聲的辦法具有十分重要的意義。本文首先從時域和頻域的角度出發(fā)定義了相位噪聲并實現(xiàn)了相位噪聲在兩者之間的轉(zhuǎn)換。其次,介紹了國際上幾種通用的相位噪聲模型的優(yōu)缺點,從而選擇最簡單最直觀的相位噪聲模型——李森模型作為本文低相噪研究的模型。但是經(jīng)典的Leeson模型只有相位噪聲與品質(zhì)因數(shù)有直接關(guān)系,并沒有針對相位噪聲的有載品質(zhì)因數(shù)和振蕩電路參數(shù)之間的一個具體關(guān)系進行深入的研究。因此,本文在Leeson模型的基礎(chǔ)上,將Razavi基于單端定義的有載品質(zhì)因數(shù)推廣到雙口網(wǎng)絡(luò)中得出有載品質(zhì)因數(shù)與電路參數(shù)的實際表達式,這樣就得到相位噪聲與電路參數(shù)值定量關(guān)系。再利用MATLAB仿真得到表達式中電路參數(shù)與相位噪聲的變化趨勢,然后可以利用關(guān)系表達式的變化趨勢指導(dǎo)低噪聲LC振蕩器的設(shè)計。考慮到片上電感的實現(xiàn)難度以及Q值不高得因素,我們通過改變電容參數(shù)來優(yōu)化設(shè)計。本文采用ADS仿真軟件以及MALTLAB進行了驗證,在此基礎(chǔ)上設(shè)計了晶體三極管的低噪聲電容三點式LC振蕩器。然后介紹了幾種通用的相位噪聲測量技術(shù),并根據(jù)其原理以及特性分析可在不同場合采用使用的測量技術(shù)。本文中使用RS信號源分析儀對制作的LC振蕩器進行相位噪聲測量。實驗事實證明,本文提出的從提高有載品質(zhì)因數(shù)的角度出發(fā)降低相位噪聲的方法是可行的,并且也驗證了LC振蕩器的諧振回路參數(shù)變化在一定范圍內(nèi)能夠有效的改善LC振蕩器的相位噪聲性能。
[Abstract]:Frequency signal sources are widely used in many military and civil fields. It is also widely used in navigation and radar, satellite tracking, cosmic communication and time and frequency measurement. With the development of modern technology, the requirement of signal source precision becomes more and more strict. Therefore, as an essential part of the frequency source electronic system, the requirements of oscillator are much more accurate. But the phase noise of the oscillator has become a critical factor limiting the performance of many electronic systems. People have to try their best to improve the phase noise of the oscillator to improve the performance of the frequency signal source in order to achieve better market demand. The LC oscillator has some market applications because of its low cost and wide adjustable range. Therefore, in the design and implementation of the actual LC oscillator, it is very important to study the theory of phase noise and put forward the method to improve the phase noise. In this paper, the phase noise is defined from the point of view of time domain and frequency domain and the transformation of phase noise between them is realized. Secondly, the advantages and disadvantages of several common phase noise models are introduced, and the most simple and intuitive phase noise model, Li Sen model, is chosen as the model of low phase noise in this paper. However, the classical Leeson model only has a direct relationship between the phase noise and the quality factor, and there is no in-depth study on the relationship between the loaded quality factor of the phase noise and the parameters of the oscillating circuit. Therefore, on the basis of Leeson model, Razavi's loaded quality factor based on single-terminal definition is extended to the actual expression of loaded quality factor and circuit parameters in two-port network, and the quantitative relationship between phase noise and circuit parameters is obtained. The variation trend of circuit parameters and phase noise in the expression can be obtained by MATLAB simulation, and then the design of low noise LC oscillator can be guided by the changing trend of the relation expression. Considering the difficulty of the on-chip inductance and the low Q value, we optimize the design by changing the capacitance parameters. Based on ads simulation software and MATLAB, a low noise capacitor LC oscillator with low noise is designed. Then, several common phase noise measurement techniques are introduced, and the measurement techniques can be used in different situations according to their principle and characteristics. In this paper, the phase noise of the LC oscillator is measured by RS signal source analyzer. The experimental results show that the method proposed in this paper is feasible to reduce the phase noise from the point of view of improving the load quality factor. It is also proved that the LC oscillator can effectively improve the phase noise performance of the LC oscillator by changing the resonant circuit parameters in a certain range.
【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】：TN752

【參考文獻】

相關(guān)碩士學(xué)位論文 前1條

1 韓金瑞;晶體振蕩器的ADS仿真優(yōu)化與設(shè)計實現(xiàn)[D];電子科技大學(xué);2012年

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本文編號：2008875