Q4.1: Referring to the Difference amplifier circuit in Figure 4.1, consider the special case where all four resistors are equal i.e. R1 = R3 = R2 = R4. In such a scenario what is the differential mode gain (A_{d})  transfer function of the circuit? Choose from one of the following:

PL2.17:

What is the region of operation for transistors M1 and M2, assuming the zero gate-source

threshold voltage V

PL2.16: Why are the drain currents of transistors M1 and M2 in the current mirror pair unequal? Choose from one of the following:

PL2.12: Analyse the circuit in Figure 2.4 to determine the current flowing through resistor R1 (I_{R1}) ? Assume both transistors Q1 and Q2 are identical having the same base-emitter voltages and base currents. The output side current should be an exact copy of the input side. Based on this information, choose from one of the following: