Question
What is the operating point of a Class A common emitter amplifier?
Answer Options
- A) Approximately halfway between saturation and cutoff
- B) Approximately halfway between the emitter voltage and the base voltage
- C) At a point where the bias resistor equals the load resistor
- D) At a point where the load line intersects the zero bias current curve
Correct Answer: A
Explanation
The Class A operating mode is defined by maximum linearity and low distortion, achieved by ensuring the active device is conducting current for the entire 360-degree input cycle. This continuous conduction requires the quiescent operating point (Q-point) to be carefully established during the design process.
The operating point of a Class A common emitter amplifier is approximately halfway between saturation and cutoff on the load line. Placing the Q-point exactly in the middle of the linear operating region ensures that the amplifier can swing the output signal equally in both directions (positive and negative) without ever hitting the limits of cutoff or saturation, thus guaranteeing maximum fidelity.
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