CHAPTER 6
BJT AMPLIFIERS
1. Amplifiers designed to handle small __________ signals are referred to as small-signal amplifiers.
ac only
2. Which of the r parameters is the most important?
r’e
3. Determine the ac emitter resistance that is operating with a dc emitter current of 5mA.
5.0 Ω
4. If βac=hfe, αac=?
hfb
5. Which of the three amplifier configurations exhibit high voltage gain and high current gain?
Common-emitter
6. An amplifier configuration which has a voltage gain of approximately 1, a high input resistance and current gain,
Common-collector
7. An amplifier configuration which provides high voltage gain with a maximum current gain of 1.
Common-base
8. Which of the amplifier configurations is the most appropriate for certain applications where sources tend to have low-resistance outputs?
Common-base
9. In a common-emitter amplifier, any change in input signal voltage results in
Opposite change in collector signal voltage
10. The ac voltage gain is the ratio of
ac output voltage at the collector to ac input voltage at the base
11. the reduction in signal voltage as it passes through a circuit
attenuation
12. the overall voltage gain of the common-emitter amplifier is the product of the voltage gain from base to collector and
reciprocal of the attenuation
13. Without the bypass capacitor, the CE amplifier’s emitter is no longer at ac ground. How does this affect the amplifier?
It decreases the ac voltage gain
14. The measure of how well an amplifier maintains its design values over changes in temperature,
Stability
15. Swamping is a method used to minimize the effect of the ____________without reducing the voltage gain to its minimum value.
ac emitter resistance
16. ___________ contains two transistors. The collectors of two transistors are connected and the emitter of the first drives the base of the second.
Darlington pair
17. _____________ consists of two types of transistors, npn and a pnp.
Complementary Darlington
18. An amplifier configuration in which the input signal is capacitively coupled to the emitter and the output is capacitively coupled from the collector,
Common-base
19. Which of the amplifier configurations is/are useful at high frequencies when impedance matching is required?
Common-base
20. The power gain of a common-base amplifier is approximately equal to
Voltage gain
21. BJT amplifier that produces output that are a function of the difference between two input voltages,
Differential amplifier
22. Ideally, a diff-amp provides a very high gain for single-ended or differential signals and _____________ gain for common-mode signals.
0
23. Input signals are out of phase
Differential amplifier
BJT AMPLIFIERS
1. Amplifiers designed to handle small __________ signals are referred to as small-signal amplifiers.
ac only
2. Which of the r parameters is the most important?
r’e
3. Determine the ac emitter resistance that is operating with a dc emitter current of 5mA.
5.0 Ω
4. If βac=hfe, αac=?
hfb
5. Which of the three amplifier configurations exhibit high voltage gain and high current gain?
Common-emitter
6. An amplifier configuration which has a voltage gain of approximately 1, a high input resistance and current gain,
Common-collector
7. An amplifier configuration which provides high voltage gain with a maximum current gain of 1.
Common-base
8. Which of the amplifier configurations is the most appropriate for certain applications where sources tend to have low-resistance outputs?
Common-base
9. In a common-emitter amplifier, any change in input signal voltage results in
Opposite change in collector signal voltage
10. The ac voltage gain is the ratio of
ac output voltage at the collector to ac input voltage at the base
11. the reduction in signal voltage as it passes through a circuit
attenuation
12. the overall voltage gain of the common-emitter amplifier is the product of the voltage gain from base to collector and
reciprocal of the attenuation
13. Without the bypass capacitor, the CE amplifier’s emitter is no longer at ac ground. How does this affect the amplifier?
It decreases the ac voltage gain
14. The measure of how well an amplifier maintains its design values over changes in temperature,
Stability
15. Swamping is a method used to minimize the effect of the ____________without reducing the voltage gain to its minimum value.
ac emitter resistance
16. ___________ contains two transistors. The collectors of two transistors are connected and the emitter of the first drives the base of the second.
Darlington pair
17. _____________ consists of two types of transistors, npn and a pnp.
Complementary Darlington
18. An amplifier configuration in which the input signal is capacitively coupled to the emitter and the output is capacitively coupled from the collector,
Common-base
19. Which of the amplifier configurations is/are useful at high frequencies when impedance matching is required?
Common-base
20. The power gain of a common-base amplifier is approximately equal to
Voltage gain
21. BJT amplifier that produces output that are a function of the difference between two input voltages,
Differential amplifier
22. Ideally, a diff-amp provides a very high gain for single-ended or differential signals and _____________ gain for common-mode signals.
0
23. Input signals are out of phase
Differential amplifier
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