# Designing different amplifiers with known gain

1. Mar 27, 2013

### CSOleson

1. The problem statement, all variables and given/known data
I am designing three amplifiers:
1. is an noninverting amplifier with G=200
2. is an inverting amplifier with G=-50
3. is a summing amplifier with V(out)--50V(in1)-3V(in2)-15(Vin3)

all problems i(outmax)=2mA

So far the only problem I have figured anything about is the noninverting amplifier. I still cannot seem to find a way to relate Vin and Vout with what I know. I got as far as finding G=i(out)R(2)
Where do I go from here?

2. Relevant equations
1. i(out)=i(2)=V(out)/(R(1)+R(2))

3. The attempt at a solution

The second two problems I don't know where to start with them.

2. Mar 27, 2013

### Staff: Mentor

What are the two basic properties of opamps that you use to figure out the gain of different configurations? One property has to do with the current that flows into the + and - terminals, and the other property has to do with the voltage difference between the + and - input when the opamp has negative feedback connected...

3. Mar 27, 2013