Achieving signal power amplification using energetically passive devices

Abstract This article discusses some fundamental properties of electronic amplifiers and the associated implications. When defining passivity a multi-port circuit in sense net power consumption (rather than ability to amplify signals), devices such as transistors, which are commonly described “active”, have be considered passive, is referred “energetically passive” avoid confusion with other definitions. It shown that, when using energetically passive achieve signal amplification, amplifier necessarily has feature non-linear transfer function. The how two common concepts (class A B amplifiers) amplification can fundamentally related Poynting’s theorem that both these allow realization at least piecewise linear functions spite necessary non-linearity.