Operational Amplifier Fundamentals Unit 5 – The Inverting Summer
If R3, R2, and R1 equal each other but RF equals the average value of the input resistors, VO
equals the average value of the input voltages.
VO = -[(V1 + V2 + V3)/3]
Op amp saturation levels limit the maximum circuit output voltage. If the product of any one
input voltage and its respective circuit gain factor is excessive, the op amp saturates.
NEW TERMS AND WORDS
inverting summing amplifier - an inverting op amp configuration that algebraically combines
two or more input voltages.
scaling, or weighted configuration - a summing amplifier configuration that allows a certain
input voltage to have more influence on the output voltage than another input voltage.
summing configuration - a summing amplifier configuration that generates an output voltage
equal to the algebraic sum of the input voltages.
averaging configuration - a summing amplifier configuration that generates an output voltage
equal to the average value of the circuit input voltages.
EQUIPMENT REQUIRED
F.A.C.E.T. base unit
Multimeter
OPERATIONAL AMPLIFIER FUNDAMENTALS circuit board