Malvino Chapter 22

Chapter 22 

1. In a nonlinear op-amp circuit, the 
a. Op amp never saturates 
b. Feedback loop is never opened 
c. Output shape is the same as the input shape 
d. Op amp may saturate 

2. To detect when the input is greater than a particular value, use a 
a. Comparator 
b. Clamper 
c. Limiter 
d. Relaxation oscillator 

3. The voltage out of a Schmitt trigger is 
a. A low voltage 
b. A high voltage 
c. Either a low or a high voltage 
d. A sine wave 


4. Hysteresis prevents false triggering associated with 
a. A sinusoidal input 
b. Noise voltages 
c. Stray capacitances 
d. Trip points 

5. If the input is a rectangular pulse, the output of an integrator is a 
a. Sine wave 
b. Square wave 
c. Ramp 
d. Rectangular pulse 

6. When a large sine wave drives a Schmitt trigger, the output is a 
a. Rectangular wave 
b. Triangular wave 
c. Rectified sine wave 
d. Series of ramps 

7.If pulse width decreases and the period stays the same, the duty cycle 
a. Decreases 
b. Stays the same 
c. Increases 
d. Is zero 

8. The output of a relaxation oscillator is a 
a. Sine wave 
b. Square wave 
c. Ramp 
d. Spike 

9. If AOL = 200,000, the closed-loop knee voltage of a silicon diode is 
a. 1 uV 
b. 3.5 uV 
c. 7 uV 
d. 14 uV 

10. The input to a peak detector is a triangular wave with a peak-to-peak value of 8 V and an average value of 0. The output is 
a. 0 
b. 4 V 
c. 8 V 
d. 16 V 

11. The input voltage to a positive limiter is a triangular wave of 8 V pp and an average value of 0. If the reference level is 2 V, the output is 
a. 0 
b. 2 Vpp 
c. 6 Vpp 
d. 8 Vpp 

12. The discharging time constant of a peak detector is 10 ms. The lowest frequency you should use is 
a.10 Hz 
b.100 Hz 
c. 1 kHz 
d. 10 kHz 

13. A comparator with a trip point of zero is sometimes called a 
a. Threshold detector 
b. Zero-crossing detector 
c. Positive limit detector 
d. Half-wave detector 

14. To work properly, many IC comparators need an external 
a. Compensating capacitor 
b. Pullup resistor 
c. Bypass circuit 
d. Output stage 

15. A Schmitt trigger uses 
a. Positive feedback 
b. Negative feedback 
c. Compensating capacitors 
d. Pullup resistors 

16. A Schmitt trigger 
a. Is a zero-crossing detector 
b. Has two trip points 
c. Produces triangular output waves 
d. Is designed to trigger on noise voltage 

17. A relaxation oscillator depends on the charging of a capacitor through a 
a. Resistor 
b. Inductor 
c. Capacitor 
d. Non-inverting input 

18. A ramp of voltage 
a. Always increases 
b. Is a rectangular pulse 
c. Increases or decreases at a linear rate 
d. Is produced by hysteresis 

19. The op-amp integrator uses 
a. Inductors 
b. The Miller effect 
c. Sinusoidal inputs 
d. Hysteresis 

20. The trip point of a comparator is the input voltage that causes 
a. The circuit to oscillate 
b. Peak detection of the input signal 
c. The output to switch states 
d. Clamping to occur 

21. In an op-amp integrator, the current through the input resistor flows into the 
a. Inverting input 
b. Noninverting input 
c. Bypass capacitor 
d. Feedback capacitor 

22. An active half-wave rectifier has a knee voltage of 
a. VK 
b. 0.7 V 
c. More than 0.7 V 
d. Much less than 0.7 V 

23. In an active peak detector, the discharging time constant is 
a. Much longer than the period 
b. Much shorter than the period 
c. Equal to the period 
d. The same as the charging time constant 

24. If the reference voltage is zero, the output of an active positive limiter is 
a. Positive 
b. Negative 
c. Either positive or negative 
d. A ramp 

25. The output of an active positive clamper is 
a. Positive 
b. Negative 
c. Either positive or negative 
d. A ramp 

26. The positive clamper adds 
a. A positive dc voltage to the input 
b. A negative dc voltage to the input 
c. An ac signal to the output 
d. A trip point to the input 

27. A window comparator 
a. Has only one usable threshold 
b. Uses hysteresis to speed up response 
c. Clamps the input positively 
d. Detects an input voltage between two limits 




Also try:

Malvino Chapter 1
Malvino Chapter 2
Malvino Chapter 3
Malvino Chapter 4
Malvino Chapter 5
Malvino Chapter 6
Malvino Chapter 7
Malvino Chapter 8
Malvino Chapter 9
Malvino Chapter 10
Malvino Chapter 11
Malvino Chapter 12
Malvino Chapter 13
Malvino Chapter 14
Malvino Chapter 15
Malvino Chapter 16
Malvino Chapter 17
Malvino Chapter 18
Malvino Chapter 19
Malvino Chapter 20
Malvino Chapter 21
Malvino Chapter 23
Malvino Chapter 24