ELECTRONICS II HOMEWORK

ELEC 161 QUIZ 1

All the questions are weighted equally

1. Design a summing amplifier based on a 741 IC chip. The amplifier has fR = 1 M Ω, 1R = 100 KΩ, 2R = 50 KΩ, and 3R = 10 KΩ. The input voltages are 1V = 100 mV sin (2000 t), and 2V = 150 mV sin (3000 t), and 3V = 200 mV sin (1000 t). Draw the summing amplifier sketch and develop an equation for its output voltage 0V in terms of the given inputs.

2. What is a voltage buffer? How does it work? Draw a sketch to show how you will use voltage buffers to provide two separate outputs from one input signal. 3. Compute the output voltage of a noninverting op-amp circuit for the input voltage 1V = 8 Volts , fR = 1 MΩ, and 1R = 50 KΩ. Sketch this amplifier circuit and show your calculations. 4. Calculate the cutoff frequency of a first-order low pass filter having 1R = 3.4 KΩ and 1C = 0.01 μF. Show your calculations and draw a sketch of this low-pass active filter. 5. Compute the cutoff frequency of an op-amp based second-order high-pass filter having 1R = 2R = 3.7 KΩ, 1C = 2C = 0.01 µF, GR = 50 KΩ, and FR = 100 KΩ. Show your calculations and draw a sketch to show this high-pass active filter.