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To improve Class B to Class AB, bias the input of the base-emitter junction of each transistor using a PN diode to eliminate the cross-over distortions of Class B amplifier.
A cmos inverter is an example of class ab circuit. It has 2 transconductors driving the output node, with 1 transconductor dominating the other during one half cycle of the signal, while the other transconductor dominates during the other half cycle.
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