Electronic Homework

ELEC 161 QUIZ 3

All the questions carry same weight

1. Design a six-stage ladder network digital-to-analog converter (DAC) using 10 K Ω and 20 KΩ resistors. Draw the sketch of this DAC.

2. Sketch the circuit of a 555 timer connected as an astable multivibrator for operation at 400 KHz. Compute the value of capacitor C needed using AR = BR = 10 KΩ. 3. Using a sketch, describe the operation of a Voltage Controlled Oscillator (VCO). Provide all the necessary equations. 4. Determine the voltage gain, input, and output, impedance with feedback for voltage-series feedback having A = - 120, iR = 20 KΩ, and oR = 40 KΩ for feedback of β = - 0.4. 5. If an amplifier with gain of -2000 and feedback of β = - 0.5 has a gain change of 40% due to temperature, compute the change in gain of the feedback amplifier. Show your calculations.