active components

Hi all, I was hoping someone might be able to provide some guidance/point me in the right direction for the below problem: The objective is to design an active bandpass with the following parameters: Centre frequency Fc = 100kHz Bandwith fH -fL = 10kHz So far I have the following: Given...

I dont know much about electronics.While studying about transistors,i had a doubt about the middle layer.If the emitter and middle layer becomes forward biased, and collector and middle layer becomes reverse biased,how does middle layer have both the charge in order to get reverse and forward...