Setting Up a High-Referenced Op-Amp with Positive Gain <1

[JerryG]

I am trying to setup a circuit with an op-amp that is referenced to high rather than ground and has a positive gain less than one. So for instance, my circuite has power rails at ground and 3.3v. I want an input of 3.3v to give an output of 3.3v and i want an input of 0 to give an output of around 1.4v. I can do the resistor calculations. I'm just not sure what that configuration would look like.

 

[Averagesupernova]

I fumbled around with this for a while until I realized why I was having trouble with it which is because I have never done a circuit like this because an op-amp isn't necessary to do it. However, that is not to say you can't do it with the op-amp. Once I realized why it isn't necessary to use an op-amp I easily figured out how to do it with one. So, let me ask you, is there some requirement to do it a certain way?

 

[Quinzio]

I am trying to setup a circuit with an op-amp that is referenced to high rather than ground and has a positive gain less than one. So for instance, my circuite has power rails at ground and 3.3v. I want an input of 3.3v to give an output of 3.3v and i want an input of 0 to give an output of around 1.4v. I can do the resistor calculations. I'm just not sure what that configuration would look like.

Isn't it better to use a resistor divider ?