Practice Performance Enhancement By Active Device (79.2.4) - Differential Amplifier : Analysis and Numerical Examples (Contd.)

Practice: Performance Enhancement by Active Device

Lesson 79.2.4Differential Amplifier : Analysis and Numerical Examples (Contd.)

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8 questions

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6 sample questions

Question 1.
What does a differential amplifier do?
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Think about the operation of amplifiers.
Question 2.
What is the typical voltage drop V_BE for BJTs?
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Consider standard values for BJT transistors.
3Question 3.
What is the main function of a differential amplifier?
- Amplify common signals
- Amplify the difference between inputs
- Provide feedback
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Consider the inputs and what the amplifier does.
4Question 4.
True or False: Increasing the common mode gain will not affect a differential amplifier.
- True
- False
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Reflect on the consequences of high common mode signals.
Question 5.
Design a differential amplifier using BJTs and replace the tail resistor with an active device. Discuss the expected outcomes.
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Focus on the benefits of active components in circuits.
Question 6.
Calculate the expected output if given a differential input of 0.02 volts and a common mode input of 0.2 volts with stated gains.
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Use the formulas for A_d and A_c to find results.

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