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2 cards from this section. Quick, good the night before a test.
Define input resistance in a common emitter amplifier.
Refer to the parallel combination of resistances.
Calculate the voltage gain if gm is 150 mA/V and RC is 2 kΩ.
Use the formula A<sub>v</sub> = -g<sub>m</sub> × R<sub>C</sub>.
What is the significance of a negative voltage gain in a CE amplifier?
Think about the nature of CE amplifiers.
Input resistance is critical because it affects signal coupling into the amplifier.
Consider how resistances work in parallel.
Given that RC is 5 kΩ and gm is 200 mA/V, calculate the voltage gain and explain how it would change if RC is halved.
Use the voltage gain formula to find changes with the modified resistors.
A common emitter amplifier experiences power dissipation at 12 V with a collector current of 3 mA. Calculate the power loss and discuss the implications for circuit design.
Review how voltage and current interact to produce power.
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