4. The circuit below is a MOSFET common-source amplifier driving a load resistor. Assume the MOSFET operates in saturation and is characterized by parameters VTN and KN. VDD VIN RD VOUT a. Derive an expression for the transfer characteristics of the amplifier: vouT versus VIN. b. Draw the small-signal equivalent circuit of the amplifier assuming the input bias voltage is VIN. Determine the small-signal gain of the amplifier. C.

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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.