Chapter 21
1. The region between the passband and the stopband is called the
a. Attenuation
b. Center
c. Transition
d. Ripple
2. The center frequency of a band-pass filter is always equal to
a. The bandwidth
b. Geometric average of the cutoff frequencies
c. Bandwidth divided by Q
d. 3-dB frequency
3. The Q of a narrowband filter is always
a. small
b. equal to BW divided by f0
c. less than 1
d. greater than 1
4. A bandstop filter is sometimes called a
a. Snubber
b. Phase shifter
c. Notch filter
d. Time-delay circuit
5. The all-pass filter has
a. No passband
b. One stopband
c. the same gain at all frequencies
d. a fast rolloff above cutoff
6. The approximation with a maximally-flat passband is
a. Chebyshev
b. Inverse Chebyshev
c. Elliptic
d. Bessel
7. The approximation with a rippled passband is
a. Butterworth
b. Inverse Chebyshev
c. Elliptic
d. Bessel
8. The approximation that distorts digital signals the least is the
a. Butterworth
b. Chebyshev
c. Elliptic
d. Bessel
9. If a filter hassix second-order stages and one first-order stage, the order is
a. 2
b. 6
c. 7
d. 13
10. If a Butterworth filter has 9 second-order stages, its rolloff rate is
a. 20 dB per decade
b. 40 dB per decade
c. 180 dB per decade
d. 360 dB per decade
11. If n = 10, the approximation with the fastest roll-off in the transition region is
a. Butterworth
b. Chebyshev
c. Inverse Chebyshev
d. Elliptic
12. The elliptic approximation has a
a. Slow rolloff rate compared to the Cauer
b. Rippled stopband
c. Maximally-flat passband
d. Monotonic stopband
13. Linear phase shift is equivalent to
a. Q = 0.707
b. Maximally-flat stopband
c. Constant time delay
d. Rippled pass band
14. The filter with the slowest rolloff rate is the
a. Butterworth
b. Chebyshev
c. Elliptic
d. Bessel
15. A first-order active-filter stage has
a. One capacitor
b. Two op amps
c. Three resistors
d. a high Q
16. A first-order stage cannot have a
a. Butterworth response
b. Chebyshev response
c. Maximally-flat pass band
d. Roll-off rate of 20 dB per decade
17. Sallen-Key filters are also called
a. VCVS filters
b. MFB filters
c. Biquadratic filters
d. State-variable filters
18. To build a 10th-order filter, we should cascade
a. 10 first-stage stages
b. 5 second-order stages
c. 3 third-order stages
d. 2 fourth-order stages
19. To get a Butterworth response with an 8th-order filter, the stages need to have
a. Equal Q's
b. Unequal center frequencies
c. Inductors
d. Staggered Q's
20. To get a Chebyshev response with a 12th-order filter, the stages need to have
a. Equal Q's
b. Equal center frequencies
c. Staggered bandwidths
d. Staggered center frequencies and Q's
21. The Q of a Sallen-Key second-order stage depends on the
a. Voltage gain
b. Center frequency
c. Bandwidth
d. GBW of the op amp
22. With Sallen-Key high-pass filters, the pole frequency must be
a. Added to the K values
b. Subtracted from the K values
c. Multiplied by the K values
d. Divided by the K values
23. If BW increases, the
a. Center frequency decreases
b. Q decreases
c. Rolloff rate increases
d. Ripples appear in the stopband
24. When Q is greater than 1,a bandpass filter should be built with
a. Low-pass and high-pass stages
b. MFB stages
c. Notch stages
d. All-pass stages
25. The all-pass filter is used when
a. High rolloff rates are needed
b. Phase shift is important
c. A maximally-flat passband is needed
d. A rippled stopband is important
26. A second-order all-pass filter can vary the output phase from
a. 90 degrees to -90 degrees
b. 0 degrees to -180 degrees
c. 0 degrees to -360 degrees
d. 0 degrees to -720 degrees
27. The all-pass filter is sometimes called a
a. Tow-Thomas filter
b. Delay equalizer
c. KHN filter
d. State-variable filter
28. The biquadratic filter
a. Has low component sensitivity
b. Uses three or more op amps
c. Is also called Tow-Thomas filter
d. All of the above
29. The state-variable filter
a. Has a low-pass, high-pass, and bandpass output
b. Is difficult to tune
c. Has high component sensitivity
d. Uses less than three op amps
30. If GBW is limited, the Q of the stage will
a. Remain the same
b. Double
c. Decrease
d. Increase
31. To correct for limited GBW, a designer may use
a. A constant time delay
b. Predistortion
c. Linear phase shift
d. A rippled passband
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 22
Malvino Chapter 23
Malvino Chapter 24
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