CHAPTER 4
QUIZ ANSWERS:
1. c) Non-inverting amplifier circuit
2. a) True
3. b) False
PROBLEMS ANSWERS:
1. The cut-off frequency is 7.96 kHz
2. The cut-off frequency is R/(2 * 3.14 * L)
3. 10 V – 5 V = 5 V
8. Voltage gain = (1 + 4/2.2) = 2.82; Vo = (5 V (peak) * 2.82)/(1 + j 6.28*2 kȍ *0.1 μF)
= 14.1/(1 + j0.001) = 14.1 V (peak) angle (–0.06°)
9. A =6; Į = 5.49
10. IJ = (650 ȍ)*(0.1* 10-6 F) = 65 μseconds. At one time constant, the voltage across the
capacitor is 0.632 * 10 V = 6.32 V.
15. Students must research the answer to Problem 15 on their own.
16. Area is increasing to 2.5 V-second till t = 1 second; area is increasing (on the top of
2.5 V-sec) and reaches to 12.5 V at t = 3 seconds; area is 15 V at t = 4 seconds; then area
starts decreasing from the total of 15 V in 4 seconds. At t = 6 seconds, area is down to 10
V and stays constant afterwards.