Noise Calculation Technique Using Time Varying Model

All oscillators are periodically time varying systems, so to accurate phase noise calculation and simulation, time varying model should be considered. Phase noise is an important characteristic of oscillator design. It defined as the spectral density of the oscillator spectrum at an offset from the center frequency of the oscillator relative to the power of the oscillator. In this paper, we study linear time invariant (LTI) and linear time variant (LTV) model’s to calculate phase noise. Moreover, we propose a simple method for Impulse Sensitivity Function (ISF) calculation. Different oscillators have been selected to evaluate the proposed method.  Simulation results show that the proposed method is simpler than other methods, and we can easily simulation ISF.噪聲計算技術使用時變模型摘要所有的振盪器週期時變系統，所以要精確的相位噪聲的計算和模擬，隨時間變化的模式應該被考慮。相位噪聲是振盪器設計的一個重要特徵。它定義為振盪器頻譜中的一個從相對於振盪器的功率的振盪器的中心頻率偏移的頻譜密度。在本文中，我們研究了線性時不變（LTI）和線性時變（LTV）模型來計算相位噪聲。此外，我們提出了脈衝靈敏度函數（ISF）計算的簡單方法。不同振盪器已選定，評估了該方法。仿真結果表明，該方法比其他方法更簡單，我們可以很容易地模擬ISF。

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Sadjad Institute for Higher Education ، en