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Question
Why do the virtual ground strategy is adopted in case of Op-amps with negative feedback mechanism corresponding to the below figure?
Why do the virtual ground strategy is adopted in case of Op-amps with negative feedback mechanism corresponding to the below figure?
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Solution
The correct option is A Due to reduction in an input voltage at inverting terminal to zero
The notion of virtual ground originates from the condition when input voltage at the inverting terminal is insisted to reach a very minute value approximately to almost zero value. Thus, the point at which inverting terminal find its connection is significantly at the ground voltage and therefore, it is regarded at the virtual ground level.
The reason behind getting reduction of input voltage to zero is the positive potential attained by point A and existence of the output voltage at the same time. Again, some part of output is fed back to input terminal out of phase. However, the sum of these two voltages become equal to zero.
The notion of virtual ground originates from the condition when input voltage at the inverting terminal is insisted to reach a very minute value approximately to almost zero value. Thus, the point at which inverting terminal find its connection is significantly at the ground voltage and therefore, it is regarded at the virtual ground level.
The reason behind getting reduction of input voltage to zero is the positive potential attained by point A and existence of the output voltage at the same time. Again, some part of output is fed back to input terminal out of phase. However, the sum of these two voltages become equal to zero.
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