How Did They Derive the Equation Using Kirchhoff's Voltage Law?

[k31453]

Homework Statement

I am following book and they got this equation but i don't know how they got it ??

Homework Equations

The Attempt at a Solution

I know they use kirchhoffs voltage law but at which point they are choosing and how they are going and acquire this equation.?

 

[Simon Bridge]

You don't apply the voltage law at a point - you apply it to a loop.
They tell you which loop they applied it to - the one containing R4 and R3.

Redraw the circuit diagram so the loop containing R4 and R3 looks like a loop and do the mesh analysis - don't forget to appropriately model the op-amp.

 

[Chopin]

Hint: Remember that all ground symbols are connected to each other.

 

[CWatters]

I find it helps by writing a KVL sum so it adds to zero. Then rearrage it. Don't start by writing "Vo = "

eg start with an equation of the form...

(v1) + (v2) + (v3)... = 0

Remembering that v1,v2, or v3... might be negative depending on which direction is defined as positive current.