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Definition of "class B-D amplifier" |
switched mode amplifier where the device is biased at cutoff, and the input signal is large enough to drive the amplifier into 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 B-D amplifier resembles a stepped squarewave. It is important to note that only frequency related information (FM) is preserved in a class B-D amplifier, while all amplitude information (AM) is lost. Usually, class B-D power amplifiers are designed in a push-pull configuration to take advantage of both halves of a cycle. |
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