Practice Input Impedance Calculation (51.1.6) - Common Base and Common Gate Amplifiers (Contd.) : Numerical Examples (Part A)

Practice: Input Impedance Calculation

Lesson 51.1.6Common Base and Common Gate Amplifiers (Contd.) : Numerical Examples (Part A)

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9 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
Define input impedance in your own words.
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Think about how resistance works with electric signals.
Question 2.
What is the primary role of a common base amplifier?
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Consider where the input and output terminals are located.
3Question 3.
What is the main purpose of a common base amplifier?
- To increase current
- To increase voltage
- To decrease impedance
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Consider what is typically measured in amplifiers.
4Question 4.
True or False: Input impedance in a common base amplifier is generally high.
- True
- False
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Remember how this type of amplifier operates.
Question 5.
Consider a common base amplifier with a source resistance of 10k Ohms, and an input impedance of 26 Ohms. What would be the expected impact on output voltage?
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Use concepts from voltage division to guide your analysis.
Question 6.
Design an amplifier circuit aiming for a gain of 50 with the lowest possible input impedance. What components would you select?
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Use the voltage gain formula and consider the importance of bypass capacitors.

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