C.9. Common-Emitter Stage with Emitter Resistor and the Emitter-Follower Amplifier Stage

It was shown that the emitter resistor of the measurement circuit of Fig. C.10 can have a significant effect on output resistance. The emitter resistor has the effect of increasing the input resistance as well, such that it is compatible with high-resistance sources and the resistor adds to the bias stability. The common-emitter stage with an emitter resistor is, in fact, a very common configuration in BJT electronics.

Here, we analyze the effect of the emitter resistor on the input resistance (at the base) and on the gain of the common-emitter stage. The development leads directly to an assessment of the signal performance of the emitter-follower (common-collector) ...

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