Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 27)
27.
Calculate the output voltage if R1 = R2 = R3 = 100 
, Rf = 1 k, and V1 = V2 = V3 = 50 mV.
, Rf = 1 k, and V1 = V2 = V3 = 50 mV. 
Discussion:
5 comments Page 1 of 1.
Sujata Eka said:
1 decade ago
using formula:-
V(out)=-(V1/R1+V2/R2+V3/R3)Rf
=>V(out)=-1.5V
V(out)=-(V1/R1+V2/R2+V3/R3)Rf
=>V(out)=-1.5V
Dheeraj Godwani said:
1 decade ago
Voltage is same in parallel network,so by voltage gain,Av=>Vo/Vi=(-Rf/R1) which are connected parallelly.
Krishna said:
1 decade ago
Simply it is a summing amplifier so output voltage is sum of all three input so answer is 1.5V and it is inverting amp. Hence negative sign is taken there. So overall output is -1.5v.
(1)
Karldan said:
7 years ago
(-rf/r)(v1+v2+v3).
(-1000/100)(3*50mv),
-1.5v.
(-1000/100)(3*50mv),
-1.5v.
(1)
Leposava said:
6 years ago
(-rf/ (r) (v1+v2+v:3).
(-1000/100)/
(3*50mv),
(-1.5v.)
= 100/15.
(-1000/100)/
(3*50mv),
(-1.5v.)
= 100/15.
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