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I doubt, if class S is a commonly used technical term, while class D obviously is. In some sources, class S is used as a more general term for any switching amplifier and class D is designating amplifiers that utilize PWM. But there may be other definitions, too.
can we say that class-d amplifier is a type of class-s amplifier?
the reason why i am asking so is that in my course book it has been mentioned
"CLASS-D AND CLASS-S OPERATION"
This understanding can be found in some literature. In contrast, another version is using class-S in particular for PWM amplifiers.
Personally, I wouldn't use it, cause I don't think that class-S is a common understood technical term. Some authors don't even mention it.
Is the term class-S explained in your course book anyhow?
P.S.: I reviewed some additional literature and came to this conclusion:
- In audio applications, a modulated (PWM, SD) switch-mode amplifier is usually designated class D.
- The same technique is often called class-S (S for "switched") in RF applications. I don't see a difference to the above class-D definition.
- In RF field, the term class-D has been previously used for saturated (switched) push-pull PA with unmodulated carrier.
Generally, there's an inflation of amplifier classes in audio applications. Classes G, H, I have been already invented, can you beat it?
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