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The operation of a typical common emitter amplifier, including negativefeedback, is studied taking into account the non-linearity characteristic ofreal-world transistors. This has been accomplished by employing a recentlyproposed Early modeling approach, which allowed the analytical equations to beobtained describing the current and voltage behavior in the adopted commonemitter circuit. Average and dispersion (coefficient of variation) of thecurrent and voltage gains can then be calculated and used to characterize thecommon emitter amplification while reflecting the transistor non-linearity.Several interesting results were obtained, including the fact that the negativefeedback provided by the emitter resistance is not capable of completelyeliminating effects of parameters differences exhibited by transistors.Importantly, transistors with larger Early voltage $V_a$ magnitudes tended toprovide significantly enhanced linearity even when substantial negativefeedback is used. These results motivates customized design, implementation andapplication approaches taking into account the parameters of the availabledevices.

Analysis of the Common Emitter Amplifier Taking into Account Transistor Non-Linearity