If the value of resistor Rf in a averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to the
A)average of the individual inputs.
B)sum of the individual inputs.
C)inverted sum of the individual inputs.
D)inverted average of the individual inputs.

Question

Quizplus · Accepted Answer

In an averaging amplifier circuit, if the feedback resistor (Rf) is equal to the value of one input resistor divided by the number of inputs, the output voltage is the negative (inverted) of the average of the input voltages. This is because the circuit sums the inputs, scales the sum according to the ratio of the feedback resistor to the input resistors, and inverts this sum due to the nature of the operational amplifier's inverting input.

If the Value of Resistor Rf in a Averaging Amplifier