Help with OP AMP Circuit Question

[shawen]

hi, i reallyt need help in this question.
i tried this but i am not sure how to start this, so if you can provide me little help i will really appreciate it

its based on OP AMP circuit

thanks guys

 

[Jeff Rosenbury]

This looks like a homework problem. Try the homework forum.

 

[jim hardy]

"Dr Hardy's Painless Method"

Here's what i find the simplest approach, and i doubt you'll find it in your textbook:
OP-amp circuits do algebra.
They do it by forcing the OP-amp's inputs equal.
It is the duty of the circuit designer to wrap the OP-amp with a circuit that allows it to do that.
So --- see if these three simple steps work for you,
1. Write the equation for voltage at opamp's - input , looks to me trivial by inspection , V- = Vo/2 .
2. Write the equation for voltage at opamp's + input, it's a function of Vin and some constants, V+ = f(Vin) , you should find that f(Vin) easily with laws of Ohm and Kirchoff
3. Set those two equations equal , V+ = V- , and solve for Vo/Vin .

Then you should prove to yourself that's the same result you'd get by your textbook methodold jim