Depicting a single transistor amplifier

Question

Question 1: Figure 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?

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 including a common-mode feedback circuit.

Question 4:

a. Figure (a) shows three voltage dividers circuits. Evaluate VREF 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 VREF

Question 5:

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

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

c. Redraw the circuit using wilson current mirrors.