Study On Modularized Analysis And Design For Low-Noise Amplifier Using The Equivalent Noise Model Method

Based on the equivalent noise models of two port network, this report improves effectively the design accuracy of low-noise amplifier using the com- plete EI, noise model of active devices obtained by the precision measure- ment ; and the noise estimation process is simplified using the modularized anal- ysis and design of complex noise network achieved by researching into the spectral relations between the E model and the other six kinds of equiva- lent noise models. It is desired to exploit the CAD software for low-noise op.- timum design of complex circuits based on research here ,and to made it with the advantages such as standard ,high univaersality,high accuracy and fast cal- culation. This report Consists of four chapters. In the first chapter, the parameters for the low-noise design scuh as the equivalent input noise voltoge E~ ,the op- timum source impedance Z and the minimum noise figure F~ are calculated accurately by using the complete E noise model. And it is pointed out that it will cause the maximum 30 4 miscalculation error when neglecting the ef- fects of the correlation coefficient Y. Moreover, the relation of EL model and RG model is built. In the second chapter, the theory of modularized analysis and design based on the EL model is presented. And the main work is focused on the problem of the synthesis of E models of multistage noise network and of the noise calculation of bias circuit of transistor amplifier. In the third chapter , the feasibility of the method here in the application of the noise analysis of low and high frequencies discrete circuit as well as integrated operationl amplifier is verified via the experiment analysis. And some useful re- suits are obtained. In the fourth chapter,the conclusions of this report are sum- marized. At last ,through comparing the characteristics of signal collection and pro cessing of two kinds of radar systems with the different radar bandwidth and aspact angle sector, the appendix of this report points out that the scattering field data collected by using the radar with narrow bandwidth and small aspect angle sector is suitable to fast, handy two ?dimensional radar target imaging and recognition. On the conditions of lowesolution radar ,a parametric mod- el for twoimensional radar target is described according to the theory of el-ectrornagentic scattering and the geometrical theory of diffraction. This modelis sPecial to high precision radar target imaging and identification since it sys-tematically describes the scattering center attributes of target which include.high resolution distance and azimuth locations,scattering level and diffractioncoeffcient characterizing the geometry of scattering center. A high resolutionestirnation algorithm to extract the model parameters is also developed bybuilding the relation of the scattering model and Prony model. The analysis ofCramer--Rao bound and simulation show that the method here has better sta-tistical perforrnance. The simulated analysis also indicates that the accurate ex-traction of the diffraction coefficient of scattering center is restricted by signal--to--noise ration,radar center frequency and radar bandwidth.