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Electronic Devices & Circuits Operational Amplifiers

An ideal inverting summing amplifier has equal 10 kOhm input resistors for V1 = 1 V and V2 = 2 V, and a 10 kOhm feedback resistor. Its output is?

A+3 V
B-3 V
C+1 V
D-1 V

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Correct Answer: B. -3 V

Explanation: For equal input and feedback resistors, Vo = -(V1 + V2) = -(1 + 2) = -3 V.

Reference: Standard analog electronics: op-amp summing amplifier

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