微波系统的噪声分析理论与测量技术

In view of the development of noise electronics and the need of actual application, this project studies the methods of noise analysis and the measurement techniques on the linear and nonlinear microwave circuits and systems. The keystone focuses on the four problems as follows. ①Two-port noise measurement of active microwave devices using the modified F50 technique is studied. Using the small-signal equivalent circuits model of active microwave devices and two-port noise analysis models as the additional information, this technique extracts the four noise parameters by measuring the single noise figure at 50Ω. Therefore, the wide bandwidth noise of active microwave devices is characterized easily and accurately. ②The method of modularized analysis and design for linear microwave circuits based on the En-In is studied. Using the complete En-In model and the modularized analysis of complex noisy networks, this method simplified the noise estimation, and has the advantage of high universality, high accuracy and fast calculation. ③An efficient measurement set for low-frequency noise characterization of active electron devices is studied. This set can automatically measure the high-resolution low-frequency noise spectrum of active electron devices. And its maximum test error is less than 4%. ④The algorithm of harmonic-balance analysis for the noise of nonlinear microwave circuits is studied. This algorithm presents a general method which is capable of making accurate, quantitative predictions about the noise of different type of nonlinear microwave circuits. This new approach also elucidates several design criteria for making it suitable to CAD-oriented analysis via identifying the mechanisms by which intrinsic device noise and external noise sources contribute to the total equivalent noise. In particular, it explains the details of how noise spectrum at the interesting port is obtained. The method is therefore efficient for large circuits with CAD and can generate information useful for noise macromodels.

本项目将线性和非线性微波系统的噪声分析与测量作为研究对象。着重解决线性微ㄏ低持兴丝谕绲脑?声建模与测量、复杂系统的噪声分析算法以及非线性微波系统中噪声分析的通用算法、相位噪声的建模、测量和抑制等难点问题。希望通过本项目的研究，能研制出适于工程应用的计算机辅助设计软件和噪声测试系统，达到准确预测和抑制噪声的康摹