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Electronic Devices & CircuitsPower Amplifiers

The maximum theoretical efficiency of an ideal class-B push-pull power amplifier with a sinusoidal output is approximately?

  • A25%
  • B50%
  • C78.5%
  • D100%
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Correct Answer: C. 78.5%
Explanation: For an ideal class-B push-pull stage delivering a sinusoid at maximum undistorted swing, the theoretical maximum efficiency is π/4 ≈ 78.5%.
Reference: Standard analog electronics: class-B efficiency
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