Analog Electronics
In an OP-amp differentiator

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

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

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

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