 Floyd Self-test in Active Filters

(Last Updated On: December 8, 2017) This is the Self-test in Chapter 15: Active Filters from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Floyd Self-test Chapter 15 Topic Outline

• Floyd Self-test in Basic Filter Responses of Active Filters
• Floyd Self-test in Filter Response Characteristics
• Floyd Self-test in Active Low-Pass Filters
• Floyd Self-test in Active High-Pass Filters
• Floyd Self-test in Active Band-Pass Filters
• Floyd Self-test in Active Band-Stop Filters
• Floyd Self-test in Filter Response Measurements

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The term pole in filter terminology refers to

• (a) a high-gain op-amp
• (b) one complete active filter
• (c) a single RC circuit
• (d) the feedback circuit

2. A single resistor and a single capacitor can be connected to form a filter with a roll-off rate of

• (a) -20 dB/decade
• (b) -40 dB/decade
• (c) -6 dB/decade
• (d) answers (a) and (c)

3. A band-pass response has

• (a) two critical frequencies
• (b) one critical frequency
• (c) a flat curve in the passband
• (d) a wide bandwidth

4. The lowest frequency passed by a low-pass filter is

• (a) 1 Hz
• (b) 0 Hz
• (c) 10 Hz
• (d) dependent on the critical frequency

5. The quality factor (Q) of a band-pass filter depends on

• (a) the critical frequencies
• (b) only the bandwidth
• (c) the center frequency and the bandwidth
• (d) only the center frequency

6. The damping factor of an active filter determines

• (a) the voltage gain
• (b) the critical frequency
• (c) the response characteristic
• (d) the roll-off rate

7. A maximally flat frequency response is known as

• (a) Chebyshev
• (b) Butterworth
• (c) Bessel
• (d) Colpitts

8. The damping factor of a filter is set by

• (a) the negative feedback circuit
• (b) the positive feedback circuit
• (c) the frequency-selective circuit
• (d) the gain of the op-amp

9. The number of poles in a filter affect the

• (a) voltage gain
• (b) bandwidth
• (c) center frequency
• (d) roll-off rate

10. Sallen-Key low-pass filters are

• (a) single-pole filters
• (b) second-order filters
• (c) Butterworth filters
• (d) band-pass filters

11. When low-pass filters are cascaded, the roll-off rate

• (a) increases
• (b) decreases
• (c) does not change

12. In a high-pass filter, the roll-off occurs

• (a) above the critical frequency
• (b) below the critical frequency
• (c) during the mid range
• (d) at the center frequency

13. A two-pole Sallen-Key high-pass filter contains

• (a) one capacitor and two resistors
• (b) two capacitors and two resistors
• (c) a feedback circuit
• (d) answers (b) and (c)

14. When a low-pass and a high-pass filter are cascaded to get a band-pass filter, the critical frequency of the low-pass filter must be

• (a) equal to the critical frequency of the high-pass filter
• (b) less than the critical frequency of the high-pass filter
• (c) greater than the critical frequency of the high-pass filter

15. A state-variable filter consists of

• (a) one op-amp with multiple-feedback paths
• (b) a summing amplifier and two integrators
• (c) a summing amplifier and two differentiators
• (d) three Butterworth stages

16. When the gain of a filter is minimum at its center frequency, it is

• (a) a band-pass filter
• (b) a band-stop filter
• (c) a notch filter
• (d) answers (b) and (c)