Question

Which of the following statements are correct for basic transistor configurations?

(a) CB Amplifiers has low input impedance and low current gain

(b) CC Amplifiers has low input impedance and high current gain

(c) CE Amplifiers has very poor voltage gain but very high input impedance

(d) The current gain of CB Amplifier is higher than the current gain of CC Amplifiers

This question was posed to me in an online interview.

Query is from Biasing Parameters in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Correct answer is (a) CB Amplifiers has low input impedance and low current gain

To explain: The CE amplifier has moderate input and output impedances. The CC amplifier has unity voltage gain. The common ba se amplifier has a unity current gain and high voltage gain.