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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: I don't understand this argument posted by Tre' on July 30, 2018 at 07:54:59:
Amplifiers are not my strength, but here's how I look at it.
Class AB is a superset that includes class A and class B.
Single-ended amplifier circuits are inherently class A.
Push-pull amplifier circuits are inherently class AB, but their operation can be confined to class A or class B.
Biasing to the center seems like an obvious starting point for a single-ended circuit. It may not be optimal in some respects, but it does maximize the usable output, which is usually one of the goals.
But I think there is more flexibility with push-pull. If it's acceptable to operate in class AB when high output is required, then the designer is free to choose the Q point based on other criteria. Hypothetically, if you take a push-pull amplifier circuit that is configured to run almost exclusively in class A, you could double the supply voltage while adjusting component values to keep the Q point the same. Now you have an amplifier that can run in class AB up to 4x the class A output power (provided the power supply and devices are up to it).
When it comes to solid state amplifiers, I think it would be hard to find a "Class A" amplifier that doesn't cross into class AB before reaching the clipping point when driving lower impedance loads.
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Follow Ups
- RE: I don't understand this argument - Dave_K 07/30/1809:23:20 07/30/18 (2)
- Theory vs Practice - BenM 14:27:27 07/30/18 (0)
- RE: I don't understand this argument - Tre' 09:38:08 07/30/18 (0)
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