Based on the amplifier given in Fig. 2, draw the small signal equivalent and  derive the two time constants associated with capacitances C1 and C2. Assume  early voltage is infinity. Finally, indicate which formula out of the two should be  used for the lower 3 dB frequency calculation? Formulate the maximum gain.  Draw a rough frequency response based on your formulation

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BJT (Bipolar Junction Transistor)

A BJT is a semiconductor device with 3 terminals that consist of a p-n junction diode that can amplify the signal or current. It is a current-controlled device. The three BJT terminals are base, collector, and emitter. The BJT works with the charge carrier, the two type of carriers in the BJT are holes and electrons, the charge carriers flow by the process of recombination. The signal to be amplifier is generally given as the input at the base terminal and an amplified form of it is available at the collector terminal.