# 9: BJT Class B Power Amplifiers


Learning Objectives

After completing this chapter, you should be able to:

• Define class B operation.
• Determine AC load lines for class B amplifier stages.
• Determine the compliance, maximum load power, efficiency and required device ratings for class B circuits.
• Discuss the advantages and disadvantages of class B operation versus class A operation.
• Discuss the origin of notch distortion and methods used to mitigate it.
• Explain the operation of a current mirror.
• Explain the operation of a Sziklai pair.
• Explain the operation and use of a $$V_{BE}$$ multiplier.
• Outline the operation of fully complimentary and quasi complimentary output stages utilizing direct coupled driver stages.
• Discuss methods to protect the output devices from overload.

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