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Opamps

OPAMP - Differential Amplifier

OPAMP DIFFERENRIATING AMPLIFIER 

The differential amplifier amplifies the difference between two input signals (-) and (+).

 

 

introduction  of a capacitor into te input path of an opamp leads to time  differentiation of the input signal.  the circuit given below represents the simplest inverting differentiator involving an OP-AMP.
as such, the circuit finds limited practicqal use, since hight frequency noise can present a derivative of comarable  magnitude to that of the signal. in practise, high-pass filtering is utilized to reduce the noise effects.
Example:
Find an expression  for the output of the inverting  differentiator Of the figure given above, if the basic Op Amp is ideal.

 

since the op amp is ideal, Vd @ 0 , and  the inverting  terminal s a virtual ground. consequenttly, Vs appears Accross capacitor C.
 

But the Capacitor  current is also the current through R ( iin=0) .

 

 

 


Keywords : Opamp, Op-amp, Amplifiers, Differentiation, Differentiatial, Current, Summing, Amplifier, Amplificator, Amplification, Info, Tutorial
Writer : delon  |
18 Apr 2006 Tue   
|  11.689 Views
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