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Need help on class AB powe amp

  1. Aug 2, 2012 #1
    I need to know how does it operate. The textbook that we got doesnt state clearly.
    Can anyone guide me on how a class AB power amp work stage by stage ? Thanks in advance.
  2. jcsd
  3. Aug 3, 2012 #2


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    it's like a Class B push-pull amp (where one transistor is "off" whenever the other is "on"). but the Class B has a little problem of crossover distortion around zero (when both transistors are "off").

    the Class AB biases the two push-pull so that they both are hanging on the threshold of "on" when the input signal is zero. this reduces crossover distortion.
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