Analog Electronics
With both bases grounded, the only offset that produces an error is the

  input offset current.
  input bias current.
  β.
  input offset voltage.

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Analog Electronics
In an OP-amp differentiator

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

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