CHAPTER 15
ACTIVE FILTERS
1. The ___________ of a band-pass filter is the ratio of the center frequency to the bandwidth.
Quality factor
2. An active filter category that rejects the frequencies within a certain bandwidth and passes frequencies outside the bandwidth
Band-stop filter
3. A filter response characteristic that provides a very flat amplitude response in the passband and a roll-off rate of -20dB/decade/pole
Butterworth characteristic
4. Each filter in a cascaded arrangement is called ___________.
Stage or section
5. It is one of the most common configurations for two-pole filter. It is also known as a voltage-controlled voltage source filter.
Sallen-Key
6. A filter required to get a third-order low-pass response. This is done by cascading a two-pole Sallen-key low-pass filter and a single-pole low-pass filter
Three-pole filter
7. Each additional filter in a cascaded arrangement adds _______dB to the roll-off rate
-20 dB
8. The rate of decrease in gain, below or above the critical frequencies of a filter.
Roll-off
9. Technology that enables the tracking and/or identification of objects.
Radio Frequency Identification
(RFID)
10. Four categories of active filters
Low-pass, high-pass, band-pass, and band-stop
11. Low-pass bandwidth is equal to
Cutoff frequency
12. Filters with the Bessel characteristic are used for filtering ________ waveforms
Pulse
13. Two common types of band-stop filters.
Multiple-feedback and state-variable
14. Tiny, very thin microchips with memory and a coil antenna
RFID tags
15. This type of tag does not require batteries. The tag is inactive until powered by the energy from the electromagnetic field of an RFID reader
Passive RFID tag
16. This type of tag is powered by a battery and is capable of communicating up to 100ft. Or more from the RFID reader.
Active RFID tag
17. Another type of tag that is a paper labelled with printing with the RF circuitry and antenna embedded in it.
Smart label
18. The property of selecting signals with certain selected frequencies while rejecting signals with other frequencies.
Selectivity
19. A pole is simply a circuit with how many resistor or capacitor?
1
20. The damping factor affects the filter response by negative feedback action. True/false
True
21. The more poles a filter has , the faster its roll-off rate is
True
22. Another term for state-variable filter
Universal active filter
23. Two methods of determining a filter’s response by measurement
Discrete point measurement and swept frequency measurement
24. Produces a constant amplitude output signal whose frequency increases linearly between two preset limits.
Swept frequency generator
25. How many poles does a Sallen-Key high pass filter have?
2
26. The center frequency of a state variable resistor is set by the _______ circuits in both integrators,
RC
ACTIVE FILTERS
1. The ___________ of a band-pass filter is the ratio of the center frequency to the bandwidth.
Quality factor
2. An active filter category that rejects the frequencies within a certain bandwidth and passes frequencies outside the bandwidth
Band-stop filter
3. A filter response characteristic that provides a very flat amplitude response in the passband and a roll-off rate of -20dB/decade/pole
Butterworth characteristic
4. Each filter in a cascaded arrangement is called ___________.
Stage or section
5. It is one of the most common configurations for two-pole filter. It is also known as a voltage-controlled voltage source filter.
Sallen-Key
6. A filter required to get a third-order low-pass response. This is done by cascading a two-pole Sallen-key low-pass filter and a single-pole low-pass filter
Three-pole filter
7. Each additional filter in a cascaded arrangement adds _______dB to the roll-off rate
-20 dB
8. The rate of decrease in gain, below or above the critical frequencies of a filter.
Roll-off
9. Technology that enables the tracking and/or identification of objects.
Radio Frequency Identification
(RFID)
10. Four categories of active filters
Low-pass, high-pass, band-pass, and band-stop
11. Low-pass bandwidth is equal to
Cutoff frequency
12. Filters with the Bessel characteristic are used for filtering ________ waveforms
Pulse
13. Two common types of band-stop filters.
Multiple-feedback and state-variable
14. Tiny, very thin microchips with memory and a coil antenna
RFID tags
15. This type of tag does not require batteries. The tag is inactive until powered by the energy from the electromagnetic field of an RFID reader
Passive RFID tag
16. This type of tag is powered by a battery and is capable of communicating up to 100ft. Or more from the RFID reader.
Active RFID tag
17. Another type of tag that is a paper labelled with printing with the RF circuitry and antenna embedded in it.
Smart label
18. The property of selecting signals with certain selected frequencies while rejecting signals with other frequencies.
Selectivity
19. A pole is simply a circuit with how many resistor or capacitor?
1
20. The damping factor affects the filter response by negative feedback action. True/false
True
21. The more poles a filter has , the faster its roll-off rate is
True
22. Another term for state-variable filter
Universal active filter
23. Two methods of determining a filter’s response by measurement
Discrete point measurement and swept frequency measurement
24. Produces a constant amplitude output signal whose frequency increases linearly between two preset limits.
Swept frequency generator
25. How many poles does a Sallen-Key high pass filter have?
2
26. The center frequency of a state variable resistor is set by the _______ circuits in both integrators,
RC
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