| Popis: |
In this paper, an analytical approach to study the noise figure of differential amplifiers is presented. First, the analytical expression of the noise figure for a four-port device is determined thanks to the use of a generalised method based on the noise-wave formalism. Then, the use of ideal baluns for the simulation of the noise figure is discussed in regards to the accuracy of the results. An analytical solution that can be implementable in a CAD software to get the correct and exact differential mode noise figure is proposed. Finally, in order to illustrate the purpose, the method is applied to the study of a differential three-branch channelized filter. |
