19-02-2013, 03:24 PM
Questions Animation: crossover distortion in a push-pull transistor amplifier
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This question consists of a series of images (one per page) that form an animation. Flip the pages with
your fingers to view this animation (or click on the ”next” button on your viewer) frame-by-frame.
The following animation shows a simple push-pull, emitter-follower amplifier circuit exhibiting crossover
distortion. Watch what happens as the input voltage goes through a whole cycle, noting when each transistor
begins to conduct, and when each transistor ceases conduction. Here are some things to look for:
• Which transistor handles which portion of the input waveform (positive versus negative)?
• Why is there a ”flat” spot in the output waveform?
• What would have to be done to this circuit to allow it to reproduce the waveform in full?