Analog Electronics
In CE configuration, the input V-I characteristics are drawn by taking

  VBE versus IE for constant value of VCE.
  VBE versus IB for constant value of IC.
  VCE versus IC for constant value of IE.
  VBE versus IB for constant value of VCE.

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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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