Practice Input Impedance (47.3.5) - Common Collector and Common Drain Amplifiers (Contd.): Numerical Examples (Part A)

Practice: Input Impedance

Lesson 47.3.5Common Collector and Common Drain Amplifiers (Contd.): Numerical Examples (Part A)

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9 questions

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6 sample questions

Question 1.
Define input impedance.
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Think about what the amplifier accepts.
Question 2.
What is voltage gain?
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Consider how much the signal is amplified.
3Question 3.
What does high input impedance help prevent?
- Signal attenuation
- Signal integrity loss
- Increased noise
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Think about how the circuit interacts with the previous one.
4Question 4.
True or False: The ideal voltage gain for a buffer amplifier is less than 1.
- True
- False
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Remember what a buffer does in an amplifier configuration.
Question 5.
Determine the input impedance of a common collector amplifier with configurations leading to a base current of 10 µA, load current of 0.5 mA, β of 120, and resistance of 4.7kΩ.
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Start by calculating each term separately.
Question 6.
Analyze how changes in load capacitance to 10 pF from 100 pF alters the performance characteristics of a common drain amplifier with respect to its upper cutoff frequency.
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Plug into the upper cutoff formula and see the difference.

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