Analog Electronics
A working diode must have

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

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Analog Electronics
In an OP-amp differentiator

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

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