GATE ECE 2001 | Question: 7

Question

An emitter-follower amplifier is shown in the figure, $Z_{i}$ is the impedance looking into the base of the transistor and $Z_{0}$ is the impedance looking into the emitter of the transistor.

• A. Draw the small signal equivalent circuit of the amplifier.
• B. Obtain an expression for $Z_{i}.$
• C. Obtain an expression for $Z_{0}$.
• D. Determine $Z_{i}$ and $Z_{0}$ if a capacitor $C_{L}$ is connected across $R_{L}$.