Summing & Difference Amplifiers

Inside this lesson

Derive the summing amplifier output formula from KCL at the virtual-ground node
Identify the special case where all input resistors are equal, producing a scaled sum
Apply the difference amplifier formula when resistor ratios are matched
Calculate outputs for both circuits given component values

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Educational content covering topics typical of a first- and second-year electrical engineering curriculum. Not a substitute for accredited coursework, and not suitable for real circuit or system design without review by a licensed professional engineer.