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If the emitter resistor is open, the ac input voltage will __________

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in Electronic Devices & Circuits by (272k points)
If the emitter resistor is open, the ac input voltage will __________

(a) Decrease

(b) Increase

(c) Remains the same

(d) Equals zero

This question was posed to me in examination.

This intriguing question comes from Voltage Amplifiers topic in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

1 Answer

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Best answer
Correct option is (b) Increase

Best explanation: An AC signal amplifier circuit is mainly used to stabilize the DC biased input voltage to the amplifier and thus only amplify the required AC signal. This stabilization is achieved by the use of an Emitter Resistance which provides the required amount of automatic biasing needed for a common emitter amplifier. If the emitter resistor is open, then the input ac voltage will eventually increase.

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