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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|push-pull]] output stage. |
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|push-pull]] output stage. |
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Revision as of 04:51, 31 May 2020
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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.
Advantages of OCL amplifiers over capacitor-coupled amplifiers include
- Avoiding the cost and bulk of an output capacitor
- better immunity to motorboat oscillation
- larger 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.
Implementations
- LM4910 by National Semiconductor
- Lab tutorial on OCL amplifier from Hong Kong Polytechnic University
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