Analog Electronics
Class AB operation is often used in power large signal) amplifiers in order to

Overcome a crossover distortion
Remove even harmonics
Get maximum efficiency
Reducing collector dissipation

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Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to input
Polarity of input and output is the same
The amplitude of output is proportional to rate of change of input
Output occurs when input is finite and constant

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