Electrical Engineering ⇒ Topic : Differentiator

Gaurav
 
Differentiator In this circuit, the passive elements of integrator, i.e., R and C are interchanged. Figure (1) shows the schematic diagram of a differentiator. In this case, the output voltage is proportional to the derivative of input voltage.
Figure (a) Differentiating circuit using OP Amp. Using KCL at node 1, it can be written as: I_{C} = I_{R} If V_{i} is the voltage at node 1, it can be given as: ............ (1) Therefore, the output voltage V, is equal to the product of time constant RC and the negative rate of change of input voltage with time. A differentiator circuit performs the reverse of the integrator circuit, i.e., if the input of differentiation is rectangular wave, the output will be square wave. It is generally used in waveshaping circuits to detect high frequency components in an input signal. It is also used as a rate of change of detector in frequency modulator. It has the following drawbacks:
 
 
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