Cheap way to compensate for crossover distortion in Class AB amplifiers

178

02:12:51

You can use an OPAMP to eliminate crossover distortion in a Class AB amplifier by putting it into the OPAMP's feedback loop. However, this results in poor bandwidth and frequency response. 

published 4 years ago

PrathikP

4 years ago

There is still crossover at the op-amp's output. Probe it and take a look. To fix that, you need to use diodes in this manner:

PrathikP

4 years ago

https://everycircuit.com/circuit/4771380329185280

PrathikP

4 years ago

https://everycircuit.com/circuit/4771380329185280

CristianDL

4 years ago

Well, the output is not taken at the OPAMP, since the crossover seen there compensates for the bias voltage of the base-emitter junctions of the transistors. The output is seen at the 4 ohm resistor.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.