An inverting scaling amplifier has three input voltages Va, Vb and Vc. Find it output voltage?

Question

TuteeHUB · Accepted Answer

V_O= ‚Äö√Ñ√∂‚àö√ë‚àö¬® [(R_F/R_a)+(R_F/R_b)+(R_F/R_c)]‚Äö√†√∂‚àö‚â•[( V_a +V_b+V_c)].

TuteeHUB · Answer

VO= ‚Äö√Ñ√∂‚àö√ë‚àö¬® {[(RF/Ra)‚Äö√†√∂‚àö‚â•Va] +[(RF/Rb)‚Äö√†√∂‚àö‚â•Vb]+[(RF/Rc)‚Äö√†√∂‚àö‚â•Vc]}

TuteeHUB · Answer

VO= ‚Äö√Ñ√∂‚àö√ë‚àö¬® [(RF/Ra)+(RF/Rb)+(RF/Rc)]‚Äö√†√∂‚àö‚â•[( Va +Vb+Vc)].

TuteeHUB · Answer

VO = ‚Äö√Ñ√∂‚àö√ë‚àö¬® {[(Ra/RF)‚Äö√†√∂‚àö‚â•Va] +[(Rb/RF)‚Äö√†√∂‚àö‚â•Vb]+[(Rc/RF)‚Äö√†√∂‚àö‚â•Vc]}

TuteeHUB · Answer

None of the mentioned

1.	An inverting scaling amplifier has three input voltages Va, Vb and Vc. Find it output voltage?
A.	V<sub>O</sub>= ‚Äö√Ñ√∂‚àö√ë‚àö¬® {[(R<sub>F</sub>/R<sub>a</sub>)‚Äö√†√∂‚àö‚â•V<sub>a</sub>] +[(R<sub>F</sub>/R<sub>b</sub>)‚Äö√†√∂‚àö‚â•V<sub>b</sub>]+[(R<sub>F</sub>/R<sub>c</sub>)‚Äö√†√∂‚àö‚â•V<sub>c</sub>]}
B.	V<sub>O</sub>= ‚Äö√Ñ√∂‚àö√ë‚àö¬® [(R<sub>F</sub>/R<sub>a</sub>)+(R<sub>F</sub>/R<sub>b</sub>)+(R<sub>F</sub>/R<sub>c</sub>)]‚Äö√†√∂‚àö‚â•[( V<sub>a</sub> +V<sub>b</sub>+V<sub>c</sub>)].
C.	V<sub>O</sub> = ‚Äö√Ñ√∂‚àö√ë‚àö¬® {[(R<sub>a</sub>/R<sub>F</sub>)‚Äö√†√∂‚àö‚â•V<sub>a</sub>] +[(R<sub>b</sub>/R<sub>F</sub>)‚Äö√†√∂‚àö‚â•V<sub>b</sub>]+[(R<sub>c</sub>/R<sub>F</sub>)‚Äö√†√∂‚àö‚â•V<sub>c</sub>]}
D.	None of the mentioned
Answer» B. V<sub>O</sub>= ‚Äö√Ñ√∂‚àö√ë‚àö¬® [(R<sub>F</sub>/R<sub>a</sub>)+(R<sub>F</sub>/R<sub>b</sub>)+(R<sub>F</sub>/R<sub>c</sub>)]‚Äö√†√∂‚àö‚â•[( V<sub>a</sub> +V<sub>b</sub>+V<sub>c</sub>)].

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