Question 1:

Figure 1 depicts a single transistor amplifier; find the biasing point (I_D, V_DS) of the transistor. Write all required equations to evaluate I_D, V_DS.

Question 2:

a. Write the equation that describes the body effect on the transistor.

b. On the graph below:

I. Indicate the stating value of V_SB on the graph.
ii. Indicate if V_SB is decreasing or increasing with the drawn arrow?

Question 3:

a. What is the topology of the opamp in Figure 3?

b. Is it a fully differential or a single ended opamp?

c. On the figure, determine the +ve and -ve input/output terminals.

d. Redraw the circuit induding a common-mode feedback circuit.

Question 4:

Figure 4 depicts a fully differential current-mirror op amp.

a. Suggest a modification to the circuit to convert it to a single-ended opamp.

b. Which type of current mirror is used here? State two drawbacks of this type.

c. Redraw the circuit using Wilson current mirrors.

Question 5:

a. Figure a shows three voltage dividers circuits. Evaluate Van for each.

b. In figure a. which circuit is most suitable for an integrated circuit? Why?

c. Figure b. depicts a voltage reference circuit. Find Vast