Question

For a common-emitter amplifier, the purpose of swamping is ________

(a) to minimize gain

(b) to reduce the effects of r’e

(c) to maximize gain

(d) no purpose

I got this question during an interview for a job.

Origin of the question is CE Amplifier with an Emitter Resistance in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

Right answer is (b) to reduce the effects of r’e

The explanation is: A swamping resistor is an unbiased resistance in the emitter (re) circuit of a common-emitter amplifier. The swamping resistor stabilizes the voltage gain and reduces distortion.