Quiz on Summing operational amplifier

In which amplifier the output voltage is equal to the negative sum of all the inputs?

• Averaging amplifier

• Summing amplifier

• Scaling amplifier

• All of the mentioned

Determine the expression of output voltage for inverting summing amplifier consisting of four internal resistors? (Assume the value of internal resistors to be equal)

• Vo = -(Rf/R )×(Va +Vb+Vc+Vd)

• Vo = (RF/R)×(Va +Vb+Vc+Vd)

• Vo = (R/ RF)×(Va +Vb+Vc+Vd)

• None of the mentioned

An inverting amplifier with gain 1 have different input voltage: 1.2v,3.2v and 4.2v. Find the output voltage?

• 4.2v

• 8.6v

• -4.2v

• -8.6v

An inverting scaling amplifier has three input voltages Va, Vb and Vc. Find it output voltage?

• VO= – {[(RF/Ra)×Va] +[(RF/Rb)×Vb]+[(RF/Rc)×Vc]}

• VO= – [(RF/Ra)+(RF/Rb)+(RF/Rc)]×[( Va +Vb+Vc)].

• VO = – {[(Ra/RF)×Va] +[(Rb/RF)×Vb]+[(Rc/RF)×Vc]}

• None of the mentioned

What is the output voltage of non inverting amplifier if three inputs are applied?

• Vo = {(1+(Rf/R)Va}

• Vo = ({1+(Rf/R)Vi}

• None of the above

• All the above