Electronics - Basic Op-Amp Circuits - Discussion

5. 

If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to

[A]. the average of the individual inputs
[B]. the inverted sum of the individual inputs
[C]. the sum of the individual inputs
[D]. the inverted average of the individual inputs

Answer: Option D

Explanation:

No answer description available for this question.

Lov said: (Dec 16, 2010)  
It's a basically comparator which compare the zero of input signal and when he got zero then he trips from one state to another state.

Manish said: (Jul 27, 2011)  
Since input impedance is very high, therefore, input current
is zero. OPAMP do not sink any current.

i(in)= i(f)
v(in) / R = - v(O) / R(f)
v(o) = - (Rf / R) v(in)
If R = Rf then v(O) = -v(in), the circuit behaves like an inverter.

Suji said: (Feb 25, 2014)  
If the input is the average means the output also the average amount.

Lakshmi said: (Sep 21, 2015)  
Output is independent of Rf.

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