Practice Input Signals And Common Mode Gain (73.1.3) - Single - ended Vs. Differential Signaling and Basic Model of a Differential Amplifier(Contd.)

Practice: Input Signals and Common Mode Gain

Lesson 73.1.3Single - ended Vs. Differential Signaling and Basic Model of a Differential Amplifier(Contd.)

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6 sample questions

Question 1.
What is the primary role of a differential amplifier?
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Think about the name 'differential'.
Question 2.
Define common mode gain.
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It's what happens when signals aren't different.
3Question 3.
What is the purpose of a differential amplifier?
- To amplify both signals equally
- To amplify the difference of signals
- To eliminate electrical noise
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Think about what the word differential implies.
4Question 4.
True or False: Common mode gain should ideally be very high.
- True
- False
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Remember the goal is to suppress common signal effects.
Question 5.
Given a differential amplifier with a gain of 50 and a common mode gain of -2, if the differential and common mode inputs are 200mV and 600mV respectively, what is the output voltage?
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Use the given formula to substitute correctly.
Question 6.
In a circuit where two amplifiers are connected in series and both have a common mode gain of 0.5, analyze how successive amplifications impact the common mode signal.
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Reflect on what happens to the noise while amplifying desired signals.

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