# lec30 (44).pdf - Microwave Integrated Circuits Professor A...

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Microwave Integrated Circuits Professor A K Nandakumaran Department of Mathematics Indian Institute of Science, Bangalore Module - 07 Lecture Number - 30 Noise Figure Circles (contd.) Hello! Welcome to another module of this course Microwave Integrated Circuits . We are in the week 7 module 4. In the previous module we had covered the various aspects of noise how noise originates how to characterize noise and then we also introduced the concept of noise figure and noise measure. And then I mentioned how to how to adjust or how to arrange stages in cascades so that you get the lowest noise figure overall. In this module we will be covering the noise figure circles or how to design a circle which has a given requirement of noise figure. How do we design that circuit so as to achieve a particular value of noise figure? So in this module we will be just we will proceeding just like in the same way that we proceeded for the gain circles that is to design that is to design a circuit having a particular value of transducer gain, unilateral case or the operating power gain of the available power gain. So let us let us see how to how to obtain these noise figure circles. So the first aspect is that we have our two port network. This is power two port network and if we consider it to be a noise less circuit, so this is our noise less two port network and so what we have is two aspects of two quantities which have to be extracted. The input referred noise voltage and the input referred noise current so this is port 1 and this