Crossover Distortion in Amplifiers: Identify which amplifier class typically exhibits crossover distortion behavior.

Introduction / Context:
Crossover distortion is a common non-linearity in amplifier circuits. It appears near the zero-crossing of the input signal, particularly in push–pull output stages. Understanding which class of amplifier exhibits this distortion helps in selecting proper biasing techniques.

Given Data / Assumptions:

• Four amplifier classes given: A, B, AB, and an unrelated term 'common pulse.'
• We want to identify which one characteristically shows crossover distortion.

Concept / Approach:

Class B amplifiers conduct for exactly 180° of the input cycle per transistor. Near the zero crossing, both transistors are off briefly due to base–emitter voltage requirements, leading to distortion called 'crossover distortion.'

Step-by-Step Solution:

Verification / Alternative check:

Practical push–pull Class B designs exhibit crossover distortion unless biasing (Class AB) is applied to minimize it. Audio engineers frequently discuss this issue in amplifier design.

Why Other Options Are Wrong:

• Class A: No crossover distortion.
• Class AB: Reduces distortion significantly but not characteristic.
• 'Common pulse' is irrelevant and incorrect.

Common Pitfalls:

• Confusing harmonic distortion (common in Class C) with crossover distortion (specific to Class B).
• Assuming all amplifier classes exhibit it equally.

Final Answer:

class B O/P stage