Question

Which of the following statements about common-base amplifier is true?

A. current gain and voltage gain, but no power gain
B. current gain and power gain, but no voltage gain
C. voltage gain, power gain, and current gain
D. voltage gain and power gain, but no current gain

Answer 1

A common-base amplifier provides voltage, power, and current gain, with a significant voltage gain due to its low input impedance and high output impedance.

Step-by-step explanation:

The correct answer to the question about characteristics of a common-base amplifier is C. voltage gain, power gain, and current gain. A common-base amplifier indeed amplifies voltage, power, and current. Since the input impedance is low and the output impedance is high in a common-base configuration, it affords a significant voltage gain. The current gain of a common-base amplifier is typically less than unity (less than 1), but since the voltage gain is significant, this leads to an overall power gain which is the product of both voltage and current gains.