C-mos op amp! Urgent

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sotomie

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hi.I am a beginner and I need to design unipolar c-mos op amp with 5 volts supply and i have no idea how to start .I know op amp have i/p stage having differential pair and common source as output stage for low Ro, also transistors used in design must be original transistor like (for eg 2n7000 ) so what should be the currents and values of resistances etc and which p-mos transistor will be used as active load with 2n7000 nmos in differential pair! I am really confused ,i tried finding something on google but couldn't find anythng useful!I've to submit the simulation on monday ,any help would be great.
Thankyou
 

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