Analog Electronics
For transistor action

  Je must be forward biased and Jc should be reverse biased.
  the base region must be very thin and lightly doped.
  all of these.
  the emitter should be heavily doped.

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB forward biased.
  EB reversed biased and CB reversed biased.
  EB reversed biased and CB forward biased.
  EB forward biased and CB reversed biased.

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Analog Electronics
In an OP-amp differentiator

Polarity of input and output is the same
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

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