Practice Expression Of Voltage Gain (27.2.1) - Common Emitter Amplifier (contd.) (Part B)

Practice: Expression of Voltage Gain

Lesson 27.2.1Common Emitter Amplifier (contd.) (Part B)

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6 sample questions

Question 1.
Define voltage gain in the context of an amplifier.
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Think about how voltage is amplified in a circuit.
Question 2.
What does the negative sign in the voltage gain formula indicate?
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Recall the phase relationship between input and output.
3Question 3.
What is the formula for the voltage gain of a common emitter amplifier?
- A = -g_m * R_C / (1 + g_m * R_E)
- A = g_m * R_C / (1 - g_m * R_E)
- A = g_m * R_E / R_C
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Look for the relationship between transconductance and the resistors involved.
4Question 4.
True or False: A larger emitter resistor will always increase voltage gain.
- True
- False
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Consider the effects of component values on gain.
Question 5.
Determine the effects on voltage gain if you increase $R_E$ from 1kΩ to 10kΩ, while keeping $g_m$ and $R_C$ constant. Explain your reasoning.
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Consider how changing resistances affects the gain formula.
Question 6.
If an amplifier circuit has a fixed input signal and you modify the output load resistance, what will be the impact on the voltage gain? Discuss the underlying principles.
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Think about the output characteristics and load effect in circuits.

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