Please help! Amplifier design problem

[doublefly]

Given the value of R1, R2 and R3. How to design an operational amplifier circuit with output Vo=aV1+bV2+cV3, where a, b, c are given value, and V1, V2, V3 are input voltage.

I have no idea in this problem. How should I think it?

 

[Arouse1973]

Look up summing amplifier as a start. Welcome to E.P BTW.
Adam

 

[LvW]

Given the value of R1, R2 and R3. How to design an operational amplifier circuit with output Vo=aV1+bV2+cV3, where a, b, c are given value, and V1, V2, V3 are input voltage.
I have no idea in this problem. How should I think it?

Only three resistors?
Resistors with given values - and the factors are also given?
Sounds a bit strange.

 

[doublefly]

Only three resistors?
Resistors with given values - and the factors are also given?
Sounds a bit strange.

Yes, all are given, and I need to design a circuit accord with the output equation.

 

[doublefly]

Look up summing amplifier as a start. Welcome to E.P BTW.
Adam

Thank a lot