I have a 4 level signal that need to be power amplified with efficiency higher than 90%.
the levels of the signal are {-3A,-A,A,3A}. assuming in each level, the amplitude is constant until the next amplitude level is switched, what class of amplifier ( or customized power amplifier) can be used to amplify that type of signal with maximum switching rate with high power efficiency?
we know that when we have two level signal, class C amplifier can do this by applying an amplifier and limiter to the input signal and then non-linearly amplify the signal with out distorting the signal (because it is 2 level) .
so is there a generalization to that approach that can keep the (4-level) signal not distorted after amplification?
To choose the best solution, it would be useful to know which is the output voltage and which are the rising/falling times you expect
For audio frequency range, I think class D amplifier is the best solution for high-efficiency application. And there are many integrated chips that can be used to implement easily.
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