Analog Electronics
Voltage controlled oscillators are used commonly in

 Frequency Modulators
 Phase Clocked loops
 All the above
 Pulse Modulators Frequency Modulators Phase Clocked loops

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Analog Electronics
In an OP-amp differentiator

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
The amplitude of output is proportional to input

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