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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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decreases in both input & output impedances
Increase in both input & output impedances
Decrease in input impedance & increase in output impedance
Increase in input impedance & decreases in output impedance

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