hi! i badly need help in this assignment our professor gave the class Design a circuit that will perform the given operation: Vo=4Vi1+(3Vi2-Vi3)-5Vi4+(1/3)(Vi5+6Vi6+3Vi7)
Is it to be solved with opamps or with micros? I hope you know that at least. Any limits on components or is it that all what you have to start solving it? I doubt so...
It sounds like he wants an analog computer. While it could probably be done with one op amp, it would be a lot easier to break it up into chunks and use several.
I agree with Bill. It's basically an analog computation, and a simple one at that since there are no integrals, derivatives etc. I recommend looking up opamp based inverting-amplifiers and summing-amplifiers. These can be combined to produce the desired functionality.
http://www.allaboutcircuits.com/vol_3/chpt_8/index.html The AAC book has a pretty good section on op amps, and I bet your text book covers the details as well. Gain of the op amp is multiplication/division, while summer circuits are adders, inverters will cover subtractions.