ELECTRONIC II Exam

ELEC 161 MID-TERM EXAM

All the questions carry same weight

1. With the help of sketches, explain the operation of a Class AB amplifier. 2. Design a summing amplifier based on a 741 IC chip. The amplifier has fR = 500 KΩ, 1R = 50 KΩ, and

2R = 25 KΩ. The input voltages are 1V = 20 mV sin(1000 t) and 2V = 50 mV sin(1500 t). Draw the sketch for this summing amplifier and develop an equation for its output voltage oV in terms of the given inputs. 3. Compute the output voltage of a noninverting op-amp circuit for the input voltage 1V = 10 Volts,

fR = 500 KΩ, and 1R = 25 KΩ. Sketch the amplifier circuit and show your calculations. 4. For a Class B amplifier with a supply voltage ccV = 21 Volts and driving a load of 16 ohms, determine the maximum input power, and transistor power dissipation. Show your calculations. 5. Calculate the efficiency of a transformer-coupled Class A amplifier for a supply of 15 Volts and an output V(p) = 8 Volts. Show your calculations. 6. With the help of sketches, explain the difference between a Class C amplifier and a Class D amplifier. 7. With the help of sketches, explain the operation of Band-Pass active filter.