Practice Investigation Of Input Common Mode Voltage Range (79.5.2) - Differential Amplifier : Analysis and Numerical Examples (Contd.)

Practice: Investigation of Input Common Mode Voltage Range

Lesson 79.5.2Differential Amplifier : Analysis and Numerical Examples (Contd.)

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8 questions

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6 sample questions

Question 1.
What is the purpose of a differential amplifier?
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Remember, the emphasis is on the difference.
Question 2.
Define Common Mode Gain.
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Think of it as the gain of the unwanted noise.
3Question 3.
What does a differential amplifier do?
- Amplifies the sum of inputs
- Amplifies the difference between inputs
- Rejects all inputs
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Think about the term 'differential'.
4Question 4.
True or False: Common mode gain is the gain of signals presented equally at both amplifier inputs.
- True
- False
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Recall the definition discussed in class.
Question 5.
Design a differential amplifier targeting a 50 dB common mode rejection ratio while providing an output swing of +/- 5V. What parameters must you consider?
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Review the concepts behind resistor selection and biasing network.
Question 6.
If your differential amplifier sees a common mode voltage of 2V and you have a differential input of 0.4V, calculate the expected output if your differential gain is 100.
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Pay attention to the effects of common mode on total output.

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