A uni-polar supply is no different from a bipolar supply as far as a general purpose op amp is concerned, all it changes is how you bias the input stage. Therefore just look up the design of any op amp. The internal biasing in an op amp is done by current sources (which look like high impedance loads) in the input and level shifting stages, which make an op amp look a lot more complicated than it really is. They typically have three stages, an input differential pair, followed by a level shifting gain stage, and a push pull low output impedance driver. Having said that, with the proliferation of single supply, two to five volt systems, the design of op-amps has changed to take into account the need to get the maximum input and output swing(rail to rail IO), resulting in new configurations for all three stages of an op amp, compared to older higher voltage BJT op-amps. There is a ton of information out on the web, both general, and specifically from manufacturers web sites data sheets, and a classic book is at http://www.designinganalogchips.com/ As an assignment, I would assume that you will have to go through the whole circuit, showing how and why you have configured it the way you have, and provide typical values with calculations, so it should be more than just copying the information from a book or web site, cheers, Richard
