Amplifier Stages

If you're looking for how linearity is maintained from one stage to another while achieving higher gains ...

Most bipolar op amps with 3 stages have each stage biased to operate in its linear region.
 
A amplifier can be horribly non linear, and produce a very linear output when you add feedback and have the open loop gain much larger than the feedback gain. Op-amp is a prime example.
 
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