When analyzing a common-emitter amplifier, it is common practice to represent the emitter diode as a small resistance.

Question

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In the small-signal analysis of a common-emitter amplifier, the dynamic (small-signal) behavior of the transistor's base-emitter junction is often modeled as a small resistance, known as the emitter resistance (re), which represents the diode's dynamic resistance at the operating point.

When Analyzing a Common-Emitter Amplifier, It Is Common Practice to Represent