Practice Input Capacitance And Voltage Gain (45.2.2) - Common Collector and Common Drain Amplifiers (Contd.): Analysis (Part A)

Practice: Input Capacitance and Voltage Gain

Lesson 45.2.2Common Collector and Common Drain Amplifiers (Contd.): Analysis (Part A)

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8 questions

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6 sample questions

Question 1.
What is input capacitance?
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Think about what happens when a signal comes into the amplifier.
Question 2.
Define voltage gain.
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It tells us how much the amplifier amplifies the signal.
3Question 3.
What is the main characteristic of a common collector amplifier?
- It amplifies current
- It enhances voltage gain
- It has low input resistance
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Think about the function of collectors in amplifiers.
4Question 4.
True or False: In a common drain amplifier, the output voltage is significantly higher than the input voltage.
- True
- False
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Consider what the term 'common drain' implies for voltage levels.
Question 5.
A common collector amplifier has an input capacitance of 4pF and a voltage gain of approximating 0.95. Calculate the effective input capacitance when considering additional capacitance of 1pF.
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Don't forget to calculate the contribution of added capacitance based on the gain.
Question 6.
Design a mathematical model that reflects the variations in output resistance for a common collector amplifier with a variable load resistance affecting output significantly. Show your workings.
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Focus on parallel resistance calculations for simplifications.

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