Electronic Devices-Amplifier Frequency Response
Electronic Devices-Amplifier Frequency Response
11. An RC network has a roll-off of 20 dB per decade. What is the total attenuation between the output voltage in the midrange of the passband as compared to the output voltage at a frequency of 10 times fc?
- –3 dB
- –20 dB
- –23 dB
- –43 dB
12. It is often convenient in amplifiers to assign a certain value of gain as the ________ dB reference.
- 0
- 1
- 6
- 10
13. For low-frequency response, all RC circuits in an amplifier may not have the same critical frequency. Which RC response will determine the critical frequency of the amplifier?
- the lowest frequency
- the center frequency
- the highest frequency
- the bypass frequency
14. A ten-times change in frequency is called a(n)
- octave.
- decade.
- decimal.
- none of the above
15. An amplifier has an output voltage of 7.6 V p-p at the midpoint of the frequency range. What is the output at fc?
- 3.8 V p-p
- 3.8 Vrms
- 5.4 Vrms
- 5.4 V p-p
16. The frequency response of an amplifier can be determined using the step response method, and measuring the output rise/fall times between
- 0% and 100% response.
- 10% and 90% response.
- 25% and 75% response.
- five time constant responses.
17. In a multistage amplifier, the overall frequency response is determined by the
- frequency response of each stage depending on the relationships of the critical frequencies.
- frequency response of the first amplifier.
- frequency response of the last amplifier.
- lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier.
18. What term means that the midrange voltage gain is assigned a value of 1 (or 0 dB)?
- critical
- Miller
- normalized
- corner
19. An RC network has values of R = 1.2 k and C = 0.22 F. Find fc.
- 3.79 kHz
- 1.89 kHz
- 603 Hz
- 60 Hz
20. Halving the power corresponds to a ________ dB ________.
- 3, decrease
- 10, decrease
- 3, increase
- 10, increase