How to Solve Inverting Op-Amp Exercises (Summing Amplifier, Grounded Resistor)
Автор: YS Electronics
Загружено: 2025-10-17
Просмотров: 251
In this inverting op-amp exercise, we must find the close loop gain, when we have multiple inputs, and a grounded parasitic resistor connected to the common node, for ideal A infinite or non ideal A non infinite large. This configuration is also known as a summing amplifier where we sum different input voltages and scale them by the resistor ratios. We use the standard equation for the operational amplifier: Vout = A*(V+ - V-) for each of the two cases, derive the concept of the virtual ground in the first case, see how this is not true in the second, and both times use KCL on the common node to derive the final close loop gain expression.
0:00 infinite gain
2:25 finite gain
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