OCL amplifier
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.{{cite web
|date = 5 May 2022
|title = OCL Amplifier Explained
|url = https://www.homemade-circuits.com/ocl-amplifier-explained/
|website = Homemade Circuit Projects
|access-date = 11 February 2025
}}
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.
Implementations
- [http://www.ti.com/product/lm4910 LM4910 by National Semiconductor]
- [http://cktse.eie.polyu.edu.hk/eie304/EN107.pdf Lab tutorial on OCL amplifier from Hong Kong Polytechnic University]