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Analog Electronics Transistor Amplifiers

A common-emitter stage has an unbypassed emitter resistance RE = 1 kOhm and small-signal emitter resistance re = 25 ohm. Neglecting other effects, the emitter degeneration is dominated by?

AThe 25 ohm intrinsic resistance only
BThe 1 kOhm external emitter resistor
CCollector-base capacitance only
DSupply resistance only

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Correct Answer: B. The 1 kOhm external emitter resistor

Explanation: Because RE is much larger than re, the external emitter resistance dominates the emitter degeneration and strongly reduces gain sensitivity.

Reference: Standard analog electronics: transistor amplifiers

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