only for opamp Experts...

[ashad]

Any one calculates the output equation of the following circuit

Rth =3K at room temperature

 

[drabos]

if this opamp is an ideal opamp (so V1=V2 and the currents are 0 in the input of the opamp), then
\[V_{1}=V_{2}=V_{ref}\frac{R_{th}}{R_{1}+R_{th}}\]
with a simple voltage dividing.
Then for example use to the V2 node the basic KCL, then the output node is:
\[Vo=Vref \frac{R_{th}(R_{f}R_{l}+R_{f}R_{h}+R_{l}R_{h})}{(R_{1}+R_{th})R_{h}R_{l}}\]

 

[Ashish.chip]

Put node equations on the 2nd and 3rd terminal of the op-amp.u'll get

V0 /Rf + Vref/Rh = Vref.Rth/(R1+Rth)[1/Rh+1/R1+1/Rf]
this is the output equation(V0).

 

[pankajdudulwar]

apply superposition theorem and get the equation for the output. Treat it as two supply voltages V1 & V2

 

[sivakumar_tumma]

Any one calculates the output equation of the following circuit

Rth =3K at room temperature

calculate voltage at V1 due to vref and at V2 due to vout. Equat them and solve for Vout...............

 

[safwatonline]

i have a question , what program u used to draw the schematic

 

[ashad]

i calculated the result ....... please verify it

Vo = V1(1/Rf+1/Rh/+1/RI) - (Vref/Rh)

 

[gingerjiang]

i calculated the result ....... please verify it

Vo = V1(1/Rf+1/Rh/+1/RI) - (Vref/Rh)

my result is Vo=V1*(Rf/Rh+Rf/Ri+1)-Vref*Rf/Rh

 

[ashad]

i calculated the result ....... please verify it

Vo = V1(1/Rf+1/Rh/+1/RI) - (Vref/Rh)

my result is Vo=V1*(Rf/Rh+Rf/Ri+1)-Vref*Rf/Rh

Really u r expert thanks i will give u five points

 

[demodb]

dear gingerjiang, check your dimension. You'll see that your equation can not be correct.

 

[gingerjiang]

hi demodb

i assume V1=V2

based on KCL on V2 point:
(Vref-V2)/Rh=V2/Ri+(V2-Vo)/Rf
then substitute V2 by V1 and get the result

i'm wrong? please show me

 

[suria3]

I have got this equation.

 

[suria3]

I have got this equation. Pls ignore the previous one.