It can't be in the saturation region for the very reason that the current is not constant for different values of Vce. You have to remember we want to amplify the base signal and we want to amplify it linearily.I still dont understand why should it be in the constant current region?
In the saturation region, the current is not constant for different values of VCE, why cant it be there?
That is because you want the amplifier to be linear with a minimum amount of distortion. If you go into the saturation or cutoff region, you'll have clipping and thus a lot of distortion.I read that in CE amplifier, its desirable to bring the amplifier into the constant current region.