CHAPTER 5
TRANSISTOR BIAS CIRCUITS
1. What biasing method is common in switching circuits?
Base bias
2. A Base bias in linear region shows that it is
Directly dependent on dc beta
3. In an emitter-feedback bias, if the collector current increases, the emitter voltage Increases
4. What happens to the base voltage in no. 10?
Increases
5. In an emitter-feedback, the increase in base voltage _________ the base current. Reduces
6. For collector-feedback bias, what provides the bias for the base-emitter junction? Collector voltage
7. As temperature goes up in a collector-feedback circuit, βDC and VBE goes _______ and __________, respectively.
Up and down
8. Collector-feedback bias provides good stability using negative feedback from
Collector to base
9. Innovations in technology would allow a doubling of the number of transistors in a given space every year and that the speed of those transistors would increase. This prediction is widely known as
Moore’s law
10. If an amplifier is not biased with correct dc voltages on the input and output, it can go ___________ when an input signal is applied.
Saturation or cutoff
11. Given a voltage-divider biased BJT, determine IC given VCC, R1, R2, RC, and RE which are 10V, 10kohms, 4.7kohms, 1kohm, and 470ohms respectively. Use βDC= 100.
5.31mA
12. What is the value of VCE in no.20?
2.19 V
13. If an emitter resistor is added to a base bias circuit, what is the value of the emitter current given VCC, RE, RC, and RB as 10V, 1kΩ, 470Ω, and 180kΩ, respectively. Use βDC=100.
3.32mA
14. Calculate for VCE in no. 22
5.12 V
15. If the dc beta in the preceding drops half of its original value, find the percent change in IC.
39.16%
16. What is the percent change in VCE?
27.17%
17. The region along the load line including all points between saturation and cutoff
Linear region
18. A voltage divider for which loading effects can be neglected
Stiff voltage divider
19. The base bias circuit arrangement has poor stability because its Q-point varies widely with
Dc beta
20. The purpose of biasing a circuit is to establish a proper stable ________.
Q-point
21. The process of returning a portion of a circuit’s output back to the input in such a way as to oppose or aid a change in the output
Feedback
TRANSISTOR BIAS CIRCUITS
1. What biasing method is common in switching circuits?
Base bias
2. A Base bias in linear region shows that it is
Directly dependent on dc beta
3. In an emitter-feedback bias, if the collector current increases, the emitter voltage Increases
4. What happens to the base voltage in no. 10?
Increases
5. In an emitter-feedback, the increase in base voltage _________ the base current. Reduces
6. For collector-feedback bias, what provides the bias for the base-emitter junction? Collector voltage
7. As temperature goes up in a collector-feedback circuit, βDC and VBE goes _______ and __________, respectively.
Up and down
8. Collector-feedback bias provides good stability using negative feedback from
Collector to base
9. Innovations in technology would allow a doubling of the number of transistors in a given space every year and that the speed of those transistors would increase. This prediction is widely known as
Moore’s law
10. If an amplifier is not biased with correct dc voltages on the input and output, it can go ___________ when an input signal is applied.
Saturation or cutoff
11. Given a voltage-divider biased BJT, determine IC given VCC, R1, R2, RC, and RE which are 10V, 10kohms, 4.7kohms, 1kohm, and 470ohms respectively. Use βDC= 100.
5.31mA
12. What is the value of VCE in no.20?
2.19 V
13. If an emitter resistor is added to a base bias circuit, what is the value of the emitter current given VCC, RE, RC, and RB as 10V, 1kΩ, 470Ω, and 180kΩ, respectively. Use βDC=100.
3.32mA
14. Calculate for VCE in no. 22
5.12 V
15. If the dc beta in the preceding drops half of its original value, find the percent change in IC.
39.16%
16. What is the percent change in VCE?
27.17%
17. The region along the load line including all points between saturation and cutoff
Linear region
18. A voltage divider for which loading effects can be neglected
Stiff voltage divider
19. The base bias circuit arrangement has poor stability because its Q-point varies widely with
Dc beta
20. The purpose of biasing a circuit is to establish a proper stable ________.
Q-point
21. The process of returning a portion of a circuit’s output back to the input in such a way as to oppose or aid a change in the output
Feedback
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