Electronic Devices - Op-Amp Applications - Discussion
Discussion Forum : Op-Amp Applications - General Questions (Q.No. 4)
4.
Determine the output voltage when V1 = –V2 = 1 V.
Discussion:
28 comments Page 3 of 3.
Raj said:
1 decade ago
Vo'=-(rf/r1)V1=-1V
Vi+= -1(20/40)=-0.5V
Vo''=(1+rf/r1)Vi+=2*(-.5)=-1
Vo=Vo'+Vo''=-1-1=-2V
So the answer should be B.correct
Vi+= -1(20/40)=-0.5V
Vo''=(1+rf/r1)Vi+=2*(-.5)=-1
Vo=Vo'+Vo''=-1-1=-2V
So the answer should be B.correct
Murad said:
1 decade ago
By using superposition principle:
Vo'=-(rf/r1)V1=-1V
Vi+= -1(20/40)=-0.5V
Vo''=(1+rf/r1)Vi+=2*(-.5)=-1
Vo=Vo'+Vo''=-1-1=-2V
So the answer should be B.
Vo'=-(rf/r1)V1=-1V
Vi+= -1(20/40)=-0.5V
Vo''=(1+rf/r1)Vi+=2*(-.5)=-1
Vo=Vo'+Vo''=-1-1=-2V
So the answer should be B.
(1)
Mallik said:
1 decade ago
Answer is -2v..
write the equations for the circuit using KCL...
let say both the terminals of op-amp are at common voltage Vb.
now equation for first combination containing V1:
[{(V1-Vb)/100k}+{(Vo-Vb)/100k}]=0.
=> V1-2Vb=-Vo --------- (1)
now equation for second combination containing V2:
[(V2-Vb)/20k] = [(Vb-0)/20k]
=> Vb=V2/2 ---------- (2)
from 1 & 2
-Vo= V1-V2;
V0=V2-V1;
Vo= -1-1
=-2v
write the equations for the circuit using KCL...
let say both the terminals of op-amp are at common voltage Vb.
now equation for first combination containing V1:
[{(V1-Vb)/100k}+{(Vo-Vb)/100k}]=0.
=> V1-2Vb=-Vo --------- (1)
now equation for second combination containing V2:
[(V2-Vb)/20k] = [(Vb-0)/20k]
=> Vb=V2/2 ---------- (2)
from 1 & 2
-Vo= V1-V2;
V0=V2-V1;
Vo= -1-1
=-2v
Ananth said:
1 decade ago
Simulation result says -2v.
Bhavik desai said:
1 decade ago
Vo = (-RF/R1)V1 + (1+(RF/R1))V2'
= -1 + (1+1)(20*V2/40)
= -2 (ACCORDING TO ME..)
= -1 + (1+1)(20*V2/40)
= -2 (ACCORDING TO ME..)
Shri said:
1 decade ago
v0=(1+rf/ri)*v1+v2 ......v2=0
Sumit said:
1 decade ago
v0=(-rf/ri)(v1-v2)
SAUMIL said:
1 decade ago
Vo = (-RF/R1)V1 + (1+(RF/R1))V2'
= -1 + (1+1)(20*V1/40)
= -2 (ACCORDING TO ME..)
= -1 + (1+1)(20*V1/40)
= -2 (ACCORDING TO ME..)
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