question about gain of an op-amp

[n00b]

would there be any problems with making the gain of an op-amp fractional?

for example I need exactly A = 1.375, I have a DC signal at the input of 0.8V and it needs to output approximately 1.1V

thanks.

 

[(*steve*)]

Nope, you can make it any number you like within the range of +/- the actual gain of the device. As the gain you want gets closer to the actual gain of the device the approximations of the gain as a simple ratio of resistor values starts to fail, but you're almost certainly not going there.

 

[Joe Bachi]

Try using a non-inverting op-amp circuit.

The gain would be A= 1+Rf/Rg
So in your case : Rf/Rg=0.375
Suppose Rg=1kΩ, then Rf=375Ω
Hope that helps

 

[BobK]

Those resistors are too low, they would load the output too much. Multiply them by 10.

Bob