Preliminary Questions

1.

Describe qualitatively the operation of the circuit in Fig. 3.1.

2.

For the circuit in Fig. 3.1, take R_S=1K, R_L=1K, the supply voltages to be $\pm15V$, and V_s to have an amplitude of 10V. Calculate g_m based on the average current. Calculate the voltage gain and output resistance of the circuit.

3.

Describe qualitatively the operation of the circuit in Fig. 3.3. What is the purpose of R₁, R₂ and the diodes? What is the purpose of the Darlington connections?

4.

If the feedback and input resistors of IC2 are 10K and 1K respectively, what is the voltage gain of the circuit in Fig. 3.3?

5.

What is the output resistance of the circuit?

6.

What is the current gain?