Explanation: In summing amplifier the output voltage is equal to the sum of all input. Since the total input is a sum of negative input, the amplifier is an inverting summing amplifier. 2. Determine the expression of output voltage for inverting summing amplifier consisting of four internal resistors? (Assume the value of internal resistors to be equal)
A. Vo= -(Rf/R )×(Va +Vb+Vc+Vd)
B. Vo= (RF/R)×(Va +Vb+Vc+Vd)
C. Vo= (R/ RF)×(Va +Vb+Vc+Vd)
D. None of the mentioned
Answer:A
Explanation: In summing amplifier the output voltage is equal to the sum of all input. Since the total input is a sum of negative input, the amplifier is an inverting summing amplifier. 2. Determine the expression of output voltage for inverting summing amplifier consisting of four internal resistors? (Assume the value of internal resistors to be equal)
A. Vo= -(Rf/R )×(Va +Vb+Vc+Vd) B. Vo= (RF/R)×(Va +Vb+Vc+Vd) C. Vo= (R/ RF)×(Va +Vb+Vc+Vd) D. None of the mentioned
Explanation: If the internal resistors of the circuit is same i.e Ra=Rb=Rc=Rd=R (since there are four internal resistor)