Question

Which of the following statement about a common base transistor is true?

(a) Very low input impedance

(b) Very low output Impedance

(c) Current gain is greater than unity

(d) Voltage gain is very low

This question was posed to me in my homework.

This question is from Operating Point of Transistor topic in section Transistor Biasing and Low Frequencies of Analog Circuits

Answer 1

Right choice is (a) Very low input impedance

For explanation: Common base transistor has very low input resistance (20Ω). It also has very high output resistance. Its current gain is less than unity and it has a medium voltage gain.