Analog Electronics
The universal bias stabilization circuit is the most popular because

  voltage divider is heavily loaded by transistor base .
  its β sensitivity is low .
  IC equals to IE.
  IC does not depend on transistor characteristic.

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Analog Electronics
In an OP-amp differentiator

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

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