Operational Amplifier Fundamentals Unit 6 – The Noninverting Summing Amplifier
Exercise 1 – Noninverting Summing Amplifier Operation
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to operate a noninverting summing
amplifier. You will verify your results with a multimeter.
EXERCISE DISCUSSION
- The output equation for the two-input noninverting summing amplifier used in this exercise
is: VO = [(V1 + V2)/2] x [1 + (R4/R3)] - The output voltage polarity equals the polarity of the average input voltage
[VA = (V1 + V2)/2]. - Due to feedback, the voltage at the summing point equals VA. Therefore, the differential
input voltage (VD) equals 0V. - Ohm's law can be applied to determine the current distribution of a noninverting summing
amplifier circuit.