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re: Efficient amplification for real-world audio
GordonScott   5/2/2012 1:19:43 PM
In fairness to the author, he is rightly pointing out that maximum efficiency is pretty much irrelevant, certainly in audio-type applications. He's also rightly pointing out that class-D isn't necessarily as efficient in real-world applications as the marketing/hype would suggest. In the real world, class-G, especially with the inner transistors in class-B, can be surprisingly efficient and vastly lower distortion than any class-D. FWIW, various combinations of class-D and switched/pumped/tracking supplies have been around for decades in things like loud-audio radio-pagers.

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re: Efficient amplification for real-world audio
bcarso   4/26/2012 9:40:56 AM
I believe there are some significant infringement issues here, considering John French's class HD patents.

Tony Casey
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re: Efficient amplification for real-world audio
Tony Casey   4/26/2012 8:48:04 AM
This article contains an number of errors. The theoretical maximum efficiency of a class A amplifier is 25% for a singled-ended stage, and 50% for a push-pull stage. Similarly, it can be shown that the maximum efficiency of a class B output stage is about 78%.

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