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Definition of "class D amplifier" |
Class D amplifier are those that output a switching waveform, at a frequency far higher than the highest audio signal that needs to be reproduced. The low pass filtered, average value of this waveform corresponds to the actual required audio waveform.Class D amplifiers are highly efficient (often up to 90% or higher) since the output transistors are either fully turned on or off during operation. This completely eliminates the use of the linear region of the transistor which is responsible for the inefficiency of other amplifier types. / switched mode amplifier where the device is biased somewhere between class A and class B cutoff, and the input signal is large enough to drive the amplifier from cut-off to heavy saturation such that only a small percentage of time is spent in transition. The amplifier is literally switched between cutoff and saturation, and thus the saturation angle is a significant percentage of the conduction angle, which is 180 degrees. The unfiltered, broadband output current waveform of a class D amplifier resembles a stepped squarewave. It is important to note that only frequency related information (FM) is preserved in a class D amplifier, while all amplitude information (AM) is lost. Usually, class D power amplifiers are designed in a push-pull configuration to take advantage of both halves of a cycle. |
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