Analog Electronics
A working diode must have

 Low resistance when forward biased, while high resistance when reverse bias
 Low resistance when forward or reverse biased
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias

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Analog Electronics
For transistor action

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

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Analog Electronics
In an OP-amp differentiator

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

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