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Equation
       
    Name

Feedback Factor

 
    Equation V out V in = - A 1 - β ⁢ A
 
    Definition of terms

Vout = output voltage of op-amp, Vin = input voltage of op-amp, A = gain of op-amp without feedback, β = fraction of output "fed back" into input

 
    Comments

  An operational amplifier (or op-amp) is a high-gain amplifier. It has two inputs at voltages V1 and V2. The output voltage is equal to A(V2−V1), where A is called the gain of the op-amp and is a large positive number, of the order of 104.

  A fraction β of this is fed back into one of the inputs, β being known as the gain of the feedback path.

  This allows for great control of the output voltage of the op-amp, which is given by the equation above.

 
    References

Digital Integrated Electronics, H Taub, D L Schilling, McGraw-Hill, 1977

       


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