Analog Electronics
In a nonlinear op-amp circuit, the

  opamp may saturate.
  output shape is the same as the input shape.
  feedback loop is never opened.
  opamp never saturates.

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Analog Electronics
In an OP-amp differentiator

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

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