最小噪音匹配Optimal Source Impedance to Trade-Off Power and Noise and to Achieve a Desired S11Optimal Noise Source Impedance: Zn=r n+jxn, NF=NFmin Optimal Gain Source Impedance Zp=r p+jxp, G=Gmax, S11=0Constant S11 contour Desired Source Impedance Z=r+jx S11=Desired Specificationuseful functions and identities Units Constants_______________________________________Table of ContentsI. IV. IX. Introduction Inputs Copyright and Trademark Notice_______________________________________IntroductionIn the design of a low noise amplifier,LNA, or mixer driver stage there exists an optimal source source impedance to provide the maximum power transfer into the transistor and thus the maximum gain. There also exists an optimal source impedance, Znopt, to provide the minimum noise figure for the circuit.……
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