🔍 Key Concepts

• Amplifier operating point (biasing) and where the transistor conducts on the input signal cycle • Relationship between conduction angle (how much of the 360° waveform is amplified) and linearity • Trade‑off between efficiency and distortion in amplifier classes

💭 Think About

• For each class (A, B, C, AB), think about how many degrees of the input signal cycle the device conducts and how that affects the shape of the output waveform. • Ask yourself: which class is biased so that the active device conducts for the entire cycle with minimal clipping or crossover effects? • Consider which classes are usually chosen for RF power efficiency versus which are preferred for high‑fidelity audio where distortion must be minimal.

✅ Before You Answer

• Verify which class has conduction over the full 360° of the input signal cycle. • Check which class is commonly used for high‑fidelity, low‑distortion audio amplifiers. • Make sure you distinguish between maximum efficiency and maximum linearity/least distortion—they are not the same thing.