Q4 Calculate the transfer function of the circuit shown if Ao- infinity R2 What choice of component values reduces the gain Vout/Vin-1 at all input frequencies HP AC Input Voltage Vin R1 112] C2 AO= ∞ Vout

= 5v1 – 2v2. Design the operational amplifier circuit so that vout = Operational amplifier circuit v1 20 k2 Vout v2

d) A regulator as shown in Figure 4 has an input voltage, Vs 12 V. The duty cycle, k = 0.35 and the switching frequency is 30 kHz. It also has an inductance, L= 200 µH, filter capacitance, C = 440 µF. The average load current, la = 1.25 A. Determine the; i. average output voltage, Va. ii. peak-to-peak output ripple voltage, AVc. iii. peak-to-peak output ripple current of inductor, AI. iv. peak current of the transistor, Ip. v. critical values of L and C. vi. critical values of L and C if Vs is increased to 14 V. Estimate the change in percentage for the critical values of L and C. V, Load V V G Figure 4

Problem • Determine the input and output impedances of the given amplifier. The op-amp datasheet gives: Zin = 2 Mohm, Zout = 75 ohm, A = 200000. 4 Find the Closed-loop voltage gain. www R OV 220 ΚΩ R₁ 10 ΚΩ out