Exam-style question
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In a summing amplifier, if the gain for input V1 is 2 and for V2 is 1, what is the relationship of the output voltage to the input voltages?.
- A.V_out = 2V1 + V2
- B.V_out = V1 + 2V2
- C.V_out = V1 + V2
- D.V_out = 2V1 - V2
Model answer
What a good answer should say
- V_out = 2V1 + V2
Explanation
Why this works
The output voltage of a summing amplifier is the weighted sum of the input voltages, where the weights are determined by the gain settings for each input. Here, V1 is amplified by a factor of 2.
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