The document discusses the small signal analysis of a common source MOSFET amplifier with a bypassed source resistor. It defines the input and output resistances of the amplifier and provides equations to calculate them. It then derives an expression for the voltage gain of the amplifier by relating the output voltage to the input voltage using small signal models of the MOSFET and other circuit elements. The voltage gain is expressed as a function of transconductance, resistances, and the source, drain, and load resistances.