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kwkam said:Usually class AB crossover distortion is low. Never hear crossover gain is low. The distortion is low, because both high side and low side is turn on at the cross over range
Audioguru said:A power amplifier's push-pull output stage is made with a pair of complementary emitter-follower transistors that have a voltage gain of 1.
Class-B has plenty of horrible crossover distortion.
Class-AB is biased for a little idle current and has no crossover distortion.
A class-A power amplifier is a room heater.
No.incol said:I think classab also has crossover distortion, the more bias current, the less distortion.
Audioguru said:No.incol said:I think classab also has crossover distortion, the more bias current, the less distortion.
When the idle current in the output transistors is correct at about 20mA to 60mA, the crossover distortion is gone. When the current is higher then a different type of crossover distortion is produced.
You cannot see crossover distortion on an oscilloscope nor hear it from class-AB audio power amplifiers and audio opamps.
Some extremists take an OPA2134 audio opamp that has distortion of only 0.00008% from their class-AB output stage and add a load resistor to operate its output in class-A to "reduce?" the distortion.