When BJTs are used in digital circuits they usually operate in the: a. active region b. breakdown region c. saturation and cutoff regions d. linear region   2. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to: a. provide voltage gain b. provide phase inversion (Inverting) c. provide a high-frequency path to improve the frequency response d. buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer

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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.