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Chapter 20: Problem 111

In a common-base amplifier, the phase difference between the input signal voltage and output voltage is \([\mathbf{2 0 0 5}]\) (A) \(\frac{\pi}{4}\) (B) \(\pi\) (C) Zero (D) \(\frac{\pi}{2}\)

Short Answer

Expert verified
The phase difference between the input signal voltage and output voltage in a common-base amplifier is zero because both the input and output signals are in phase with each other. Therefore, the correct answer is (C) Zero.

Step by step solution

01

Understanding the Common-Base Amplifier Configuration

A common-base amplifier is a type of transistor amplifier that has the input applied to the emitter and the output taken from the collector. The base terminal is a common terminal to both input and output, serving as a reference point.
02

Analyzing the Circuit Behavior

Since the output is taken from the collector and input is applied to the emitter, when an AC input signal voltage is applied, the variations in the input signal will cause the variations in the collector current. This variation in collector current will further lead to a variation in the output voltage.
03

Identifying the Phase Relationship

The common-base amplifier has a unique characteristic in that when the input signal increases, the output voltage also increases. This implies that both the input and output signals are in phase with each other in a common-base amplifier.
04

Determining the Phase Difference

Since the input and output voltage signals are in phase with each other in a common-base amplifier, the phase difference between them is zero. This corresponds to option (C) in the given question. So the correct answer is: (C) Zero.

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