Practice Department Of Electronics And Electrical Communication Engineering (8.1.2)

Practice: Department of Electronics and Electrical Communication Engineering

Lesson 8.1.2Revisiting BJT Characteristics (Contd.) - Part A

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8 questions

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6 sample questions

Question 1.
What two types of bias can a BJT operate under?
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Think about the potential difference applied to the p-n junctions.
Question 2.
What does the term 'forward bias' mean?
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Consider which way current flows in the device.
3Question 3.
What happens to the collector current when the base-emitter voltage increases?
- It remains constant
- It decreases
- It increases
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Consider the exponential I-V relationship.
4Question 4.
True or False: The base current is always larger than the collector current.
- True
- False
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Think about the definitions and roles of collector and base currents.
Question 5.
If the base-emitter voltage is increased to 0.7 V, estimate the increase in collector current assuming the saturation current is 1µA.
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Ensure to consider thermal voltage V_T at room temperature (~25 mV).
Question 6.
How would the BJT's performance change if the emitter doping is increased drastically?
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Think about the implications of minority carrier lifetimes and gradients.

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