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OCL amplifier

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An OCL amplifier (output capacitor-less amplifier) is any audio amplifier with direct-coupled capacitorless output. Typically, OCL amplifiers can be any of several amplifier classes, and typically have a push–pull output stage.[1]

Advantages of OCL amplifiers over capacitor-coupled amplifiers include

  • Avoiding the cost and bulk of an output capacitor
  • Better immunity to motorboat oscillation
  • Greater output power at very low frequencies and DC

Disadvantages of OCL amplifiers include

  • Larger power dissipation and passing DC through the load, in the minority of designs with poorly controlled DC bias point
  • Increased sensitivity of the output DC bias point to process variations, although the last disadvantage is less important for older bipolar processes.
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